diff --git a/CMakeLists.txt b/CMakeLists.txt
index f39a05109c65baae465509baf953678bfc9f3535..8df55a7fbd3f2aa19ad432187c753c6a445b1a8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -580,6 +580,9 @@ set(ZIG_STD_FILES
     "os/linux/vdso.zig"
     "os/linux/x86_64.zig"
     "os/linux/arm64.zig"
+    "os/freebsd/errno.zig"
+    "os/freebsd/index.zig"
+    "os/freebsd/x86_64.zig"
     "os/path.zig"
     "os/time.zig"
     "os/windows/advapi32.zig"
diff --git a/std/os/freebsd.zig b/std/os/freebsd.zig
deleted file mode 100644
index 8a582db92f2dd31b0f18882c4d9bdf36fefb941a..0000000000000000000000000000000000000000
--- a/std/os/freebsd.zig
+++ /dev/null
@@ -1,572 +0,0 @@
-const c = @import("../c/index.zig");
-const assert = @import("../debug.zig").assert;
-const builtin = @import("builtin");
-const arch = switch (builtin.arch) {
-    builtin.Arch.x86_64 => @import("x86_64.zig"),
-    else => @compileError("unsupported arch"),
-};
-pub use @import("errno.zig");
-
-pub const PATH_MAX = 1024;
-
-pub const STDIN_FILENO = 0;
-pub const STDOUT_FILENO = 1;
-pub const STDERR_FILENO = 2;
-
-pub const PROT_NONE = 0;
-pub const PROT_READ = 1;
-pub const PROT_WRITE = 2;
-pub const PROT_EXEC = 4;
-
-pub const MAP_FAILED = @maxValue(usize);
-pub const MAP_SHARED = 0x0001;
-pub const MAP_PRIVATE = 0x0002;
-pub const MAP_FIXED = 0x0010;
-pub const MAP_STACK = 0x0400;
-pub const MAP_NOSYNC = 0x0800;
-pub const MAP_ANON = 0x1000;
-pub const MAP_ANONYMOUS = MAP_ANON;
-pub const MAP_FILE = 0;
-pub const MAP_NORESERVE = 0;
-
-pub const MAP_GUARD = 0x00002000;
-pub const MAP_EXCL = 0x00004000;
-pub const MAP_NOCORE = 0x00020000;
-pub const MAP_PREFAULT_READ = 0x00040000;
-pub const MAP_32BIT = 0x00080000;
-
-pub const WNOHANG = 1;
-pub const WUNTRACED = 2;
-pub const WSTOPPED = WUNTRACED;
-pub const WCONTINUED = 4;
-pub const WNOWAIT = 8;
-pub const WEXITED = 16;
-pub const WTRAPPED = 32;
-
-pub const SA_ONSTACK = 0x0001;
-pub const SA_RESTART = 0x0002;
-pub const SA_RESETHAND = 0x0004;
-pub const SA_NOCLDSTOP = 0x0008;
-pub const SA_NODEFER = 0x0010;
-pub const SA_NOCLDWAIT = 0x0020;
-pub const SA_SIGINFO = 0x0040;
-
-pub const SIGHUP = 1;
-pub const SIGINT = 2;
-pub const SIGQUIT = 3;
-pub const SIGILL = 4;
-pub const SIGTRAP = 5;
-pub const SIGABRT = 6;
-pub const SIGIOT = SIGABRT;
-pub const SIGEMT = 7;
-pub const SIGFPE = 8;
-pub const SIGKILL = 9;
-pub const SIGBUS = 10;
-pub const SIGSEGV = 11;
-pub const SIGSYS = 12;
-pub const SIGPIPE = 13;
-pub const SIGALRM = 14;
-pub const SIGTERM = 15;
-pub const SIGURG = 16;
-pub const SIGSTOP = 17;
-pub const SIGTSTP = 18;
-pub const SIGCONT = 19;
-pub const SIGCHLD = 20;
-pub const SIGTTIN = 21;
-pub const SIGTTOU = 22;
-pub const SIGIO = 23;
-pub const SIGXCPU = 24;
-pub const SIGXFSZ = 25;
-pub const SIGVTALRM = 26;
-pub const SIGPROF = 27;
-pub const SIGWINCH = 28;
-pub const SIGINFO = 29;
-pub const SIGUSR1 = 30;
-pub const SIGUSR2 = 31;
-pub const SIGTHR = 32;
-pub const SIGLWP = SIGTHR;
-pub const SIGLIBRT = 33;
-
-pub const SIGRTMIN = 65;
-pub const SIGRTMAX = 126;
-
-pub const O_RDONLY = 0o0;
-pub const O_WRONLY = 0o1;
-pub const O_RDWR = 0o2;
-pub const O_ACCMODE = 0o3;
-
-pub const O_CREAT = arch.O_CREAT;
-pub const O_EXCL = arch.O_EXCL;
-pub const O_NOCTTY = arch.O_NOCTTY;
-pub const O_TRUNC = arch.O_TRUNC;
-pub const O_APPEND = arch.O_APPEND;
-pub const O_NONBLOCK = arch.O_NONBLOCK;
-pub const O_DSYNC = arch.O_DSYNC;
-pub const O_SYNC = arch.O_SYNC;
-pub const O_RSYNC = arch.O_RSYNC;
-pub const O_DIRECTORY = arch.O_DIRECTORY;
-pub const O_NOFOLLOW = arch.O_NOFOLLOW;
-pub const O_CLOEXEC = arch.O_CLOEXEC;
-
-pub const O_ASYNC = arch.O_ASYNC;
-pub const O_DIRECT = arch.O_DIRECT;
-pub const O_LARGEFILE = arch.O_LARGEFILE;
-pub const O_NOATIME = arch.O_NOATIME;
-pub const O_PATH = arch.O_PATH;
-pub const O_TMPFILE = arch.O_TMPFILE;
-pub const O_NDELAY = arch.O_NDELAY;
-
-pub const SEEK_SET = 0;
-pub const SEEK_CUR = 1;
-pub const SEEK_END = 2;
-
-pub const SIG_BLOCK = 1;
-pub const SIG_UNBLOCK = 2;
-pub const SIG_SETMASK = 3;
-
-pub const SOCK_STREAM = 1;
-pub const SOCK_DGRAM = 2;
-pub const SOCK_RAW = 3;
-pub const SOCK_RDM = 4;
-pub const SOCK_SEQPACKET = 5;
-
-pub const SOCK_CLOEXEC = 0x10000000;
-pub const SOCK_NONBLOCK = 0x20000000;
-
-// TODO: From here
-pub const PROTO_ip = 0o000;
-pub const PROTO_icmp = 0o001;
-pub const PROTO_igmp = 0o002;
-pub const PROTO_ggp = 0o003;
-pub const PROTO_ipencap = 0o004;
-pub const PROTO_st = 0o005;
-pub const PROTO_tcp = 0o006;
-pub const PROTO_egp = 0o010;
-pub const PROTO_pup = 0o014;
-pub const PROTO_udp = 0o021;
-pub const PROTO_hmp = 0o024;
-pub const PROTO_xns_idp = 0o026;
-pub const PROTO_rdp = 0o033;
-pub const PROTO_iso_tp4 = 0o035;
-pub const PROTO_xtp = 0o044;
-pub const PROTO_ddp = 0o045;
-pub const PROTO_idpr_cmtp = 0o046;
-pub const PROTO_ipv6 = 0o051;
-pub const PROTO_ipv6_route = 0o053;
-pub const PROTO_ipv6_frag = 0o054;
-pub const PROTO_idrp = 0o055;
-pub const PROTO_rsvp = 0o056;
-pub const PROTO_gre = 0o057;
-pub const PROTO_esp = 0o062;
-pub const PROTO_ah = 0o063;
-pub const PROTO_skip = 0o071;
-pub const PROTO_ipv6_icmp = 0o072;
-pub const PROTO_ipv6_nonxt = 0o073;
-pub const PROTO_ipv6_opts = 0o074;
-pub const PROTO_rspf = 0o111;
-pub const PROTO_vmtp = 0o121;
-pub const PROTO_ospf = 0o131;
-pub const PROTO_ipip = 0o136;
-pub const PROTO_encap = 0o142;
-pub const PROTO_pim = 0o147;
-pub const PROTO_raw = 0o377;
-
-pub const PF_UNSPEC = 0;
-pub const PF_LOCAL = 1;
-pub const PF_UNIX = PF_LOCAL;
-pub const PF_FILE = PF_LOCAL;
-pub const PF_INET = 2;
-pub const PF_AX25 = 3;
-pub const PF_IPX = 4;
-pub const PF_APPLETALK = 5;
-pub const PF_NETROM = 6;
-pub const PF_BRIDGE = 7;
-pub const PF_ATMPVC = 8;
-pub const PF_X25 = 9;
-pub const PF_INET6 = 10;
-pub const PF_ROSE = 11;
-pub const PF_DECnet = 12;
-pub const PF_NETBEUI = 13;
-pub const PF_SECURITY = 14;
-pub const PF_KEY = 15;
-pub const PF_NETLINK = 16;
-pub const PF_ROUTE = PF_NETLINK;
-pub const PF_PACKET = 17;
-pub const PF_ASH = 18;
-pub const PF_ECONET = 19;
-pub const PF_ATMSVC = 20;
-pub const PF_RDS = 21;
-pub const PF_SNA = 22;
-pub const PF_IRDA = 23;
-pub const PF_PPPOX = 24;
-pub const PF_WANPIPE = 25;
-pub const PF_LLC = 26;
-pub const PF_IB = 27;
-pub const PF_MPLS = 28;
-pub const PF_CAN = 29;
-pub const PF_TIPC = 30;
-pub const PF_BLUETOOTH = 31;
-pub const PF_IUCV = 32;
-pub const PF_RXRPC = 33;
-pub const PF_ISDN = 34;
-pub const PF_PHONET = 35;
-pub const PF_IEEE802154 = 36;
-pub const PF_CAIF = 37;
-pub const PF_ALG = 38;
-pub const PF_NFC = 39;
-pub const PF_VSOCK = 40;
-pub const PF_MAX = 41;
-
-pub const AF_UNSPEC = PF_UNSPEC;
-pub const AF_LOCAL = PF_LOCAL;
-pub const AF_UNIX = AF_LOCAL;
-pub const AF_FILE = AF_LOCAL;
-pub const AF_INET = PF_INET;
-pub const AF_AX25 = PF_AX25;
-pub const AF_IPX = PF_IPX;
-pub const AF_APPLETALK = PF_APPLETALK;
-pub const AF_NETROM = PF_NETROM;
-pub const AF_BRIDGE = PF_BRIDGE;
-pub const AF_ATMPVC = PF_ATMPVC;
-pub const AF_X25 = PF_X25;
-pub const AF_INET6 = PF_INET6;
-pub const AF_ROSE = PF_ROSE;
-pub const AF_DECnet = PF_DECnet;
-pub const AF_NETBEUI = PF_NETBEUI;
-pub const AF_SECURITY = PF_SECURITY;
-pub const AF_KEY = PF_KEY;
-pub const AF_NETLINK = PF_NETLINK;
-pub const AF_ROUTE = PF_ROUTE;
-pub const AF_PACKET = PF_PACKET;
-pub const AF_ASH = PF_ASH;
-pub const AF_ECONET = PF_ECONET;
-pub const AF_ATMSVC = PF_ATMSVC;
-pub const AF_RDS = PF_RDS;
-pub const AF_SNA = PF_SNA;
-pub const AF_IRDA = PF_IRDA;
-pub const AF_PPPOX = PF_PPPOX;
-pub const AF_WANPIPE = PF_WANPIPE;
-pub const AF_LLC = PF_LLC;
-pub const AF_IB = PF_IB;
-pub const AF_MPLS = PF_MPLS;
-pub const AF_CAN = PF_CAN;
-pub const AF_TIPC = PF_TIPC;
-pub const AF_BLUETOOTH = PF_BLUETOOTH;
-pub const AF_IUCV = PF_IUCV;
-pub const AF_RXRPC = PF_RXRPC;
-pub const AF_ISDN = PF_ISDN;
-pub const AF_PHONET = PF_PHONET;
-pub const AF_IEEE802154 = PF_IEEE802154;
-pub const AF_CAIF = PF_CAIF;
-pub const AF_ALG = PF_ALG;
-pub const AF_NFC = PF_NFC;
-pub const AF_VSOCK = PF_VSOCK;
-pub const AF_MAX = PF_MAX;
-
-pub const DT_UNKNOWN = 0;
-pub const DT_FIFO = 1;
-pub const DT_CHR = 2;
-pub const DT_DIR = 4;
-pub const DT_BLK = 6;
-pub const DT_REG = 8;
-pub const DT_LNK = 10;
-pub const DT_SOCK = 12;
-pub const DT_WHT = 14;
-
-pub const TCGETS = 0x5401;
-pub const TCSETS = 0x5402;
-pub const TCSETSW = 0x5403;
-pub const TCSETSF = 0x5404;
-pub const TCGETA = 0x5405;
-pub const TCSETA = 0x5406;
-pub const TCSETAW = 0x5407;
-pub const TCSETAF = 0x5408;
-pub const TCSBRK = 0x5409;
-pub const TCXONC = 0x540A;
-pub const TCFLSH = 0x540B;
-pub const TIOCEXCL = 0x540C;
-pub const TIOCNXCL = 0x540D;
-pub const TIOCSCTTY = 0x540E;
-pub const TIOCGPGRP = 0x540F;
-pub const TIOCSPGRP = 0x5410;
-pub const TIOCOUTQ = 0x5411;
-pub const TIOCSTI = 0x5412;
-pub const TIOCGWINSZ = 0x5413;
-pub const TIOCSWINSZ = 0x5414;
-pub const TIOCMGET = 0x5415;
-pub const TIOCMBIS = 0x5416;
-pub const TIOCMBIC = 0x5417;
-pub const TIOCMSET = 0x5418;
-pub const TIOCGSOFTCAR = 0x5419;
-pub const TIOCSSOFTCAR = 0x541A;
-pub const FIONREAD = 0x541B;
-pub const TIOCINQ = FIONREAD;
-pub const TIOCLINUX = 0x541C;
-pub const TIOCCONS = 0x541D;
-pub const TIOCGSERIAL = 0x541E;
-pub const TIOCSSERIAL = 0x541F;
-pub const TIOCPKT = 0x5420;
-pub const FIONBIO = 0x5421;
-pub const TIOCNOTTY = 0x5422;
-pub const TIOCSETD = 0x5423;
-pub const TIOCGETD = 0x5424;
-pub const TCSBRKP = 0x5425;
-pub const TIOCSBRK = 0x5427;
-pub const TIOCCBRK = 0x5428;
-pub const TIOCGSID = 0x5429;
-pub const TIOCGRS485 = 0x542E;
-pub const TIOCSRS485 = 0x542F;
-pub const TIOCGPTN = 0x80045430;
-pub const TIOCSPTLCK = 0x40045431;
-pub const TIOCGDEV = 0x80045432;
-pub const TCGETX = 0x5432;
-pub const TCSETX = 0x5433;
-pub const TCSETXF = 0x5434;
-pub const TCSETXW = 0x5435;
-pub const TIOCSIG = 0x40045436;
-pub const TIOCVHANGUP = 0x5437;
-pub const TIOCGPKT = 0x80045438;
-pub const TIOCGPTLCK = 0x80045439;
-pub const TIOCGEXCL = 0x80045440;
-
-fn unsigned(s: i32) u32 {
-    return @bitCast(u32, s);
-}
-fn signed(s: u32) i32 {
-    return @bitCast(i32, s);
-}
-pub fn WEXITSTATUS(s: i32) i32 {
-    return signed((unsigned(s) & 0xff00) >> 8);
-}
-pub fn WTERMSIG(s: i32) i32 {
-    return signed(unsigned(s) & 0x7f);
-}
-pub fn WSTOPSIG(s: i32) i32 {
-    return WEXITSTATUS(s);
-}
-pub fn WIFEXITED(s: i32) bool {
-    return WTERMSIG(s) == 0;
-}
-pub fn WIFSTOPPED(s: i32) bool {
-    return @intCast(u16, ((unsigned(s) & 0xffff) *% 0x10001) >> 8) > 0x7f00;
-}
-pub fn WIFSIGNALED(s: i32) bool {
-    return (unsigned(s) & 0xffff) -% 1 < 0xff;
-}
-
-pub const winsize = extern struct {
-    ws_row: u16,
-    ws_col: u16,
-    ws_xpixel: u16,
-    ws_ypixel: u16,
-};
-
-/// Get the errno from a syscall return value, or 0 for no error.
-pub fn getErrno(r: usize) usize {
-    const signed_r = @bitCast(isize, r);
-    return if (signed_r > -4096 and signed_r < 0) @intCast(usize, -signed_r) else 0;
-}
-
-pub fn dup2(old: i32, new: i32) usize {
-    return arch.syscall2(arch.SYS_dup2, @intCast(usize, old), @intCast(usize, new));
-}
-
-pub fn chdir(path: [*]const u8) usize {
-    return arch.syscall1(arch.SYS_chdir, @ptrToInt(path));
-}
-
-pub fn execve(path: [*]const u8, argv: [*]const ?[*]const u8, envp: [*]const ?[*]const u8) usize {
-    return arch.syscall3(arch.SYS_execve, @ptrToInt(path), @ptrToInt(argv), @ptrToInt(envp));
-}
-
-pub fn fork() usize {
-    return arch.syscall0(arch.SYS_fork);
-}
-
-pub fn getcwd(buf: [*]u8, size: usize) usize {
-    return arch.syscall2(arch.SYS___getcwd, @ptrToInt(buf), size);
-}
-
-pub fn getdents(fd: i32, dirp: [*]u8, count: usize) usize {
-    return arch.syscall3(arch.SYS_getdents, @intCast(usize, fd), @ptrToInt(dirp), count);
-}
-
-pub fn isatty(fd: i32) bool {
-    var wsz: winsize = undefined;
-    return arch.syscall3(arch.SYS_ioctl, @intCast(usize, fd), TIOCGWINSZ, @ptrToInt(&wsz)) == 0;
-}
-
-pub fn readlink(noalias path: [*]const u8, noalias buf_ptr: [*]u8, buf_len: usize) usize {
-    return arch.syscall3(arch.SYS_readlink, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len);
-}
-
-pub fn mkdir(path: [*]const u8, mode: u32) usize {
-    return arch.syscall2(arch.SYS_mkdir, @ptrToInt(path), mode);
-}
-
-pub fn mmap(address: ?*u8, length: usize, prot: usize, flags: usize, fd: i32, offset: isize) usize {
-    return arch.syscall6(arch.SYS_mmap, @ptrToInt(address), length, prot, flags, @intCast(usize, fd), @bitCast(usize, offset));
-}
-
-pub fn munmap(address: usize, length: usize) usize {
-    return arch.syscall2(arch.SYS_munmap, address, length);
-}
-
-pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
-    return arch.syscall3(arch.SYS_read, @intCast(usize, fd), @ptrToInt(buf), count);
-}
-
-pub fn rmdir(path: [*]const u8) usize {
-    return arch.syscall1(arch.SYS_rmdir, @ptrToInt(path));
-}
-
-pub fn symlink(existing: [*]const u8, new: [*]const u8) usize {
-    return arch.syscall2(arch.SYS_symlink, @ptrToInt(existing), @ptrToInt(new));
-}
-
-pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: usize) usize {
-    return arch.syscall4(arch.SYS_pread, @intCast(usize, fd), @ptrToInt(buf), count, offset);
-}
-
-pub fn pipe(fd: *[2]i32) usize {
-    return pipe2(fd, 0);
-}
-
-pub fn pipe2(fd: *[2]i32, flags: usize) usize {
-    return arch.syscall2(arch.SYS_pipe2, @ptrToInt(fd), flags);
-}
-
-pub fn write(fd: i32, buf: [*]const u8, count: usize) usize {
-    return arch.syscall3(arch.SYS_write, @intCast(usize, fd), @ptrToInt(buf), count);
-}
-
-pub fn pwrite(fd: i32, buf: [*]const u8, count: usize, offset: usize) usize {
-    return arch.syscall4(arch.SYS_pwrite, @intCast(usize, fd), @ptrToInt(buf), count, offset);
-}
-
-pub fn rename(old: [*]const u8, new: [*]const u8) usize {
-    return arch.syscall2(arch.SYS_rename, @ptrToInt(old), @ptrToInt(new));
-}
-
-pub fn open(path: [*]const u8, flags: u32, perm: usize) usize {
-    return arch.syscall3(arch.SYS_open, @ptrToInt(path), flags, perm);
-}
-
-pub fn create(path: [*]const u8, perm: usize) usize {
-    return arch.syscall2(arch.SYS_creat, @ptrToInt(path), perm);
-}
-
-pub fn openat(dirfd: i32, path: [*]const u8, flags: usize, mode: usize) usize {
-    return arch.syscall4(arch.SYS_openat, @intCast(usize, dirfd), @ptrToInt(path), flags, mode);
-}
-
-pub fn close(fd: i32) usize {
-    return arch.syscall1(arch.SYS_close, @intCast(usize, fd));
-}
-
-pub fn lseek(fd: i32, offset: isize, ref_pos: usize) usize {
-    return arch.syscall3(arch.SYS_lseek, @intCast(usize, fd), @bitCast(usize, offset), ref_pos);
-}
-
-pub fn exit(status: i32) noreturn {
-    _ = arch.syscall1(arch.SYS_exit, @bitCast(usize, isize(status)));
-    unreachable;
-}
-
-pub fn getrandom(buf: &u8, count: usize, flags: u32) usize {
-    return arch.syscall3(arch.SYS_getrandom, @ptrToInt(buf), count, @bitCast(usize, flags));
-}
-
-pub fn kill(pid: i32, sig: i32) usize {
-    return arch.syscall2(arch.SYS_kill, @bitCast(usize, @intCast(isize, pid)), @intCast(usize, sig));
-}
-
-pub fn unlink(path: [*]const u8) usize {
-    return arch.syscall1(arch.SYS_unlink, @ptrToInt(path));
-}
-
-pub fn waitpid(pid: i32, status: *i32, options: i32) usize {
-    return arch.syscall4(arch.SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), @bitCast(usize, isize(options)), 0);
-}
-
-pub fn nanosleep(req: *const timespec, rem: ?*timespec) usize {
-    return arch.syscall2(arch.SYS_nanosleep, @ptrToInt(req), @ptrToInt(rem));
-}
-
-pub fn setuid(uid: u32) usize {
-    return arch.syscall1(arch.SYS_setuid, uid);
-}
-
-pub fn setgid(gid: u32) usize {
-    return arch.syscall1(arch.SYS_setgid, gid);
-}
-
-pub fn setreuid(ruid: u32, euid: u32) usize {
-    return arch.syscall2(arch.SYS_setreuid, ruid, euid);
-}
-
-pub fn setregid(rgid: u32, egid: u32) usize {
-    return arch.syscall2(arch.SYS_setregid, rgid, egid);
-}
-
-pub fn sigprocmask(flags: u32, noalias set: *const sigset_t, noalias oldset: ?*sigset_t) usize {
-    // TODO: Implement
-    return 0;
-}
-
-pub fn sigaction(sig: u6, noalias act: *const Sigaction, noalias oact: ?*Sigaction) usize {
-    // TODO: Implement
-    return 0;
-}
-
-const NSIG = 65;
-const sigset_t = [128 / @sizeOf(usize)]usize;
-const all_mask = []usize{@maxValue(usize)};
-const app_mask = []usize{0xfffffffc7fffffff};
-
-/// Renamed from `sigaction` to `Sigaction` to avoid conflict with the syscall.
-pub const Sigaction = struct {
-    // TODO: Adjust to use freebsd struct layout
-    handler: extern fn (i32) void,
-    mask: sigset_t,
-    flags: u32,
-};
-
-pub const SIG_ERR = @intToPtr(extern fn (i32) void, @maxValue(usize));
-pub const SIG_DFL = @intToPtr(extern fn (i32) void, 0);
-pub const SIG_IGN = @intToPtr(extern fn (i32) void, 1);
-pub const empty_sigset = []usize{0} ** sigset_t.len;
-
-pub fn raise(sig: i32) usize {
-    // TODO implement, see linux equivalent for what we want to try and do
-    return 0;
-}
-
-fn blockAllSignals(set: *sigset_t) void {
-    // TODO implement
-}
-
-fn blockAppSignals(set: *sigset_t) void {
-    // TODO implement
-}
-
-fn restoreSignals(set: *sigset_t) void {
-    // TODO implement
-}
-
-pub fn sigaddset(set: *sigset_t, sig: u6) void {
-    const s = sig - 1;
-    (*set)[usize(s) / usize.bit_count] |= usize(1) << (s & (usize.bit_count - 1));
-}
-
-pub fn sigismember(set: *const sigset_t, sig: u6) bool {
-    const s = sig - 1;
-    return ((*set)[usize(s) / usize.bit_count] & (usize(1) << (s & (usize.bit_count - 1)))) != 0;
-}
-
-pub const Stat = arch.Stat;
-pub const timespec = arch.timespec;
-
-pub fn fstat(fd: i32, stat_buf: *Stat) usize {
-    return arch.syscall2(arch.SYS_fstat, @intCast(usize, fd), @ptrToInt(stat_buf));
-}
diff --git a/std/os/freebsd/errno.zig b/std/os/freebsd/errno.zig
new file mode 100644
index 0000000000000000000000000000000000000000..0a0d825f5ac368652284e913b0294812ac6fdff7
--- /dev/null
+++ b/std/os/freebsd/errno.zig
@@ -0,0 +1,121 @@
+pub const EPERM = 1; // Operation not permitted
+pub const ENOENT = 2; // No such file or directory
+pub const ESRCH = 3; // No such process
+pub const EINTR = 4; // Interrupted system call
+pub const EIO = 5; // Input/output error
+pub const ENXIO = 6; // Device not configured
+pub const E2BIG = 7; // Argument list too long
+pub const ENOEXEC = 8; // Exec format error
+pub const EBADF = 9; // Bad file descriptor
+pub const ECHILD = 10; // No child processes
+pub const EDEADLK = 11; // Resource deadlock avoided
+// 11 was EAGAIN
+pub const ENOMEM = 12; // Cannot allocate memory
+pub const EACCES = 13; // Permission denied
+pub const EFAULT = 14; // Bad address
+pub const ENOTBLK = 15; // Block device required
+pub const EBUSY = 16; // Device busy
+pub const EEXIST = 17; // File exists
+pub const EXDEV = 18; // Cross-device link
+pub const ENODEV = 19; // Operation not supported by device
+pub const ENOTDIR = 20; // Not a directory
+pub const EISDIR = 21; // Is a directory
+pub const EINVAL = 22; // Invalid argument
+pub const ENFILE = 23; // Too many open files in system
+pub const EMFILE = 24; // Too many open files
+pub const ENOTTY = 25; // Inappropriate ioctl for device
+pub const ETXTBSY = 26; // Text file busy
+pub const EFBIG = 27; // File too large
+pub const ENOSPC = 28; // No space left on device
+pub const ESPIPE = 29; // Illegal seek
+pub const EROFS = 30; // Read-only filesystem
+pub const EMLINK = 31; // Too many links
+pub const EPIPE = 32; // Broken pipe
+
+// math software
+pub const EDOM = 33; // Numerical argument out of domain
+pub const ERANGE = 34; // Result too large
+
+// non-blocking and interrupt i/o
+pub const EAGAIN = 35; // Resource temporarily unavailable
+pub const EWOULDBLOCK = EAGAIN; // Operation would block
+pub const EINPROGRESS = 36; // Operation now in progress
+pub const EALREADY = 37; // Operation already in progress
+
+// ipc/network software -- argument errors
+pub const ENOTSOCK = 38; // Socket operation on non-socket
+pub const EDESTADDRREQ = 39; // Destination address required
+pub const EMSGSIZE = 40; // Message too long
+pub const EPROTOTYPE = 41; // Protocol wrong type for socket
+pub const ENOPROTOOPT = 42; // Protocol not available
+pub const EPROTONOSUPPORT = 43; // Protocol not supported
+pub const ESOCKTNOSUPPORT = 44; // Socket type not supported
+pub const EOPNOTSUPP = 45; // Operation not supported
+pub const ENOTSUP = EOPNOTSUPP; // Operation not supported
+pub const EPFNOSUPPORT = 46; // Protocol family not supported
+pub const EAFNOSUPPORT = 47; // Address family not supported by protocol family
+pub const EADDRINUSE = 48; // Address already in use
+pub const EADDRNOTAVAIL = 49; // Can't assign requested address
+
+// ipc/network software -- operational errors
+pub const ENETDOWN = 50; // Network is down
+pub const ENETUNREACH = 51; // Network is unreachable
+pub const ENETRESET = 52; // Network dropped connection on reset
+pub const ECONNABORTED = 53; // Software caused connection abort
+pub const ECONNRESET = 54; // Connection reset by peer
+pub const ENOBUFS = 55; // No buffer space available
+pub const EISCONN = 56; // Socket is already connected
+pub const ENOTCONN = 57; // Socket is not connected
+pub const ESHUTDOWN = 58; // Can't send after socket shutdown
+pub const ETOOMANYREFS = 59; // Too many references: can't splice
+pub const ETIMEDOUT = 60; // Operation timed out
+pub const ECONNREFUSED = 61; // Connection refused
+
+pub const ELOOP = 62; // Too many levels of symbolic links
+pub const ENAMETOOLONG = 63; // File name too long
+
+// should be rearranged
+pub const EHOSTDOWN = 64; // Host is down
+pub const EHOSTUNREACH = 65; // No route to host
+pub const ENOTEMPTY = 66; // Directory not empty
+
+// quotas & mush
+pub const EPROCLIM = 67; // Too many processes
+pub const EUSERS = 68; // Too many users
+pub const EDQUOT = 69; // Disc quota exceeded
+
+// Network File System
+pub const ESTALE = 70; // Stale NFS file handle
+pub const EREMOTE = 71; // Too many levels of remote in path
+pub const EBADRPC = 72; // RPC struct is bad
+pub const ERPCMISMATCH = 73; // RPC version wrong
+pub const EPROGUNAVAIL = 74; // RPC prog. not avail
+pub const EPROGMISMATCH = 75; // Program version wrong
+pub const EPROCUNAVAIL = 76; // Bad procedure for program
+
+pub const ENOLCK = 77; // No locks available
+pub const ENOSYS = 78; // Function not implemented
+
+pub const EFTYPE = 79; // Inappropriate file type or format
+pub const EAUTH = 80; // Authentication error
+pub const ENEEDAUTH = 81; // Need authenticator
+pub const EIDRM = 82; // Identifier removed
+pub const ENOMSG = 83; // No message of desired type
+pub const EOVERFLOW = 84; // Value too large to be stored in data type
+pub const ECANCELED = 85; // Operation canceled
+pub const EILSEQ = 86; // Illegal byte sequence
+pub const ENOATTR = 87; // Attribute not found
+
+pub const EDOOFUS = 88; // Programming error
+
+pub const EBADMSG = 89; // Bad message
+pub const EMULTIHOP = 90; // Multihop attempted
+pub const ENOLINK = 91; // Link has been severed
+pub const EPROTO = 92; // Protocol error
+
+pub const ENOTCAPABLE = 93; // Capabilities insufficient
+pub const ECAPMODE = 94; // Not permitted in capability mode
+pub const ENOTRECOVERABLE = 95; // State not recoverable
+pub const EOWNERDEAD = 96; // Previous owner died
+
+pub const ELAST = 96; // Must be equal largest errno
diff --git a/std/os/freebsd/index.zig b/std/os/freebsd/index.zig
new file mode 100644
index 0000000000000000000000000000000000000000..e856f6291cae77c90a19999887ad8dddb77f2a68
--- /dev/null
+++ b/std/os/freebsd/index.zig
@@ -0,0 +1,571 @@
+const assert = @import("../debug.zig").assert;
+const builtin = @import("builtin");
+const arch = switch (builtin.arch) {
+    builtin.Arch.x86_64 => @import("x86_64.zig"),
+    else => @compileError("unsupported arch"),
+};
+pub use @import("errno.zig");
+
+pub const PATH_MAX = 1024;
+
+pub const STDIN_FILENO = 0;
+pub const STDOUT_FILENO = 1;
+pub const STDERR_FILENO = 2;
+
+pub const PROT_NONE = 0;
+pub const PROT_READ = 1;
+pub const PROT_WRITE = 2;
+pub const PROT_EXEC = 4;
+
+pub const MAP_FAILED = @maxValue(usize);
+pub const MAP_SHARED = 0x0001;
+pub const MAP_PRIVATE = 0x0002;
+pub const MAP_FIXED = 0x0010;
+pub const MAP_STACK = 0x0400;
+pub const MAP_NOSYNC = 0x0800;
+pub const MAP_ANON = 0x1000;
+pub const MAP_ANONYMOUS = MAP_ANON;
+pub const MAP_FILE = 0;
+pub const MAP_NORESERVE = 0;
+
+pub const MAP_GUARD = 0x00002000;
+pub const MAP_EXCL = 0x00004000;
+pub const MAP_NOCORE = 0x00020000;
+pub const MAP_PREFAULT_READ = 0x00040000;
+pub const MAP_32BIT = 0x00080000;
+
+pub const WNOHANG = 1;
+pub const WUNTRACED = 2;
+pub const WSTOPPED = WUNTRACED;
+pub const WCONTINUED = 4;
+pub const WNOWAIT = 8;
+pub const WEXITED = 16;
+pub const WTRAPPED = 32;
+
+pub const SA_ONSTACK = 0x0001;
+pub const SA_RESTART = 0x0002;
+pub const SA_RESETHAND = 0x0004;
+pub const SA_NOCLDSTOP = 0x0008;
+pub const SA_NODEFER = 0x0010;
+pub const SA_NOCLDWAIT = 0x0020;
+pub const SA_SIGINFO = 0x0040;
+
+pub const SIGHUP = 1;
+pub const SIGINT = 2;
+pub const SIGQUIT = 3;
+pub const SIGILL = 4;
+pub const SIGTRAP = 5;
+pub const SIGABRT = 6;
+pub const SIGIOT = SIGABRT;
+pub const SIGEMT = 7;
+pub const SIGFPE = 8;
+pub const SIGKILL = 9;
+pub const SIGBUS = 10;
+pub const SIGSEGV = 11;
+pub const SIGSYS = 12;
+pub const SIGPIPE = 13;
+pub const SIGALRM = 14;
+pub const SIGTERM = 15;
+pub const SIGURG = 16;
+pub const SIGSTOP = 17;
+pub const SIGTSTP = 18;
+pub const SIGCONT = 19;
+pub const SIGCHLD = 20;
+pub const SIGTTIN = 21;
+pub const SIGTTOU = 22;
+pub const SIGIO = 23;
+pub const SIGXCPU = 24;
+pub const SIGXFSZ = 25;
+pub const SIGVTALRM = 26;
+pub const SIGPROF = 27;
+pub const SIGWINCH = 28;
+pub const SIGINFO = 29;
+pub const SIGUSR1 = 30;
+pub const SIGUSR2 = 31;
+pub const SIGTHR = 32;
+pub const SIGLWP = SIGTHR;
+pub const SIGLIBRT = 33;
+
+pub const SIGRTMIN = 65;
+pub const SIGRTMAX = 126;
+
+pub const O_RDONLY = 0o0;
+pub const O_WRONLY = 0o1;
+pub const O_RDWR = 0o2;
+pub const O_ACCMODE = 0o3;
+
+pub const O_CREAT = arch.O_CREAT;
+pub const O_EXCL = arch.O_EXCL;
+pub const O_NOCTTY = arch.O_NOCTTY;
+pub const O_TRUNC = arch.O_TRUNC;
+pub const O_APPEND = arch.O_APPEND;
+pub const O_NONBLOCK = arch.O_NONBLOCK;
+pub const O_DSYNC = arch.O_DSYNC;
+pub const O_SYNC = arch.O_SYNC;
+pub const O_RSYNC = arch.O_RSYNC;
+pub const O_DIRECTORY = arch.O_DIRECTORY;
+pub const O_NOFOLLOW = arch.O_NOFOLLOW;
+pub const O_CLOEXEC = arch.O_CLOEXEC;
+
+pub const O_ASYNC = arch.O_ASYNC;
+pub const O_DIRECT = arch.O_DIRECT;
+pub const O_LARGEFILE = arch.O_LARGEFILE;
+pub const O_NOATIME = arch.O_NOATIME;
+pub const O_PATH = arch.O_PATH;
+pub const O_TMPFILE = arch.O_TMPFILE;
+pub const O_NDELAY = arch.O_NDELAY;
+
+pub const SEEK_SET = 0;
+pub const SEEK_CUR = 1;
+pub const SEEK_END = 2;
+
+pub const SIG_BLOCK = 1;
+pub const SIG_UNBLOCK = 2;
+pub const SIG_SETMASK = 3;
+
+pub const SOCK_STREAM = 1;
+pub const SOCK_DGRAM = 2;
+pub const SOCK_RAW = 3;
+pub const SOCK_RDM = 4;
+pub const SOCK_SEQPACKET = 5;
+
+pub const SOCK_CLOEXEC = 0x10000000;
+pub const SOCK_NONBLOCK = 0x20000000;
+
+// TODO: From here
+pub const PROTO_ip = 0o000;
+pub const PROTO_icmp = 0o001;
+pub const PROTO_igmp = 0o002;
+pub const PROTO_ggp = 0o003;
+pub const PROTO_ipencap = 0o004;
+pub const PROTO_st = 0o005;
+pub const PROTO_tcp = 0o006;
+pub const PROTO_egp = 0o010;
+pub const PROTO_pup = 0o014;
+pub const PROTO_udp = 0o021;
+pub const PROTO_hmp = 0o024;
+pub const PROTO_xns_idp = 0o026;
+pub const PROTO_rdp = 0o033;
+pub const PROTO_iso_tp4 = 0o035;
+pub const PROTO_xtp = 0o044;
+pub const PROTO_ddp = 0o045;
+pub const PROTO_idpr_cmtp = 0o046;
+pub const PROTO_ipv6 = 0o051;
+pub const PROTO_ipv6_route = 0o053;
+pub const PROTO_ipv6_frag = 0o054;
+pub const PROTO_idrp = 0o055;
+pub const PROTO_rsvp = 0o056;
+pub const PROTO_gre = 0o057;
+pub const PROTO_esp = 0o062;
+pub const PROTO_ah = 0o063;
+pub const PROTO_skip = 0o071;
+pub const PROTO_ipv6_icmp = 0o072;
+pub const PROTO_ipv6_nonxt = 0o073;
+pub const PROTO_ipv6_opts = 0o074;
+pub const PROTO_rspf = 0o111;
+pub const PROTO_vmtp = 0o121;
+pub const PROTO_ospf = 0o131;
+pub const PROTO_ipip = 0o136;
+pub const PROTO_encap = 0o142;
+pub const PROTO_pim = 0o147;
+pub const PROTO_raw = 0o377;
+
+pub const PF_UNSPEC = 0;
+pub const PF_LOCAL = 1;
+pub const PF_UNIX = PF_LOCAL;
+pub const PF_FILE = PF_LOCAL;
+pub const PF_INET = 2;
+pub const PF_AX25 = 3;
+pub const PF_IPX = 4;
+pub const PF_APPLETALK = 5;
+pub const PF_NETROM = 6;
+pub const PF_BRIDGE = 7;
+pub const PF_ATMPVC = 8;
+pub const PF_X25 = 9;
+pub const PF_INET6 = 10;
+pub const PF_ROSE = 11;
+pub const PF_DECnet = 12;
+pub const PF_NETBEUI = 13;
+pub const PF_SECURITY = 14;
+pub const PF_KEY = 15;
+pub const PF_NETLINK = 16;
+pub const PF_ROUTE = PF_NETLINK;
+pub const PF_PACKET = 17;
+pub const PF_ASH = 18;
+pub const PF_ECONET = 19;
+pub const PF_ATMSVC = 20;
+pub const PF_RDS = 21;
+pub const PF_SNA = 22;
+pub const PF_IRDA = 23;
+pub const PF_PPPOX = 24;
+pub const PF_WANPIPE = 25;
+pub const PF_LLC = 26;
+pub const PF_IB = 27;
+pub const PF_MPLS = 28;
+pub const PF_CAN = 29;
+pub const PF_TIPC = 30;
+pub const PF_BLUETOOTH = 31;
+pub const PF_IUCV = 32;
+pub const PF_RXRPC = 33;
+pub const PF_ISDN = 34;
+pub const PF_PHONET = 35;
+pub const PF_IEEE802154 = 36;
+pub const PF_CAIF = 37;
+pub const PF_ALG = 38;
+pub const PF_NFC = 39;
+pub const PF_VSOCK = 40;
+pub const PF_MAX = 41;
+
+pub const AF_UNSPEC = PF_UNSPEC;
+pub const AF_LOCAL = PF_LOCAL;
+pub const AF_UNIX = AF_LOCAL;
+pub const AF_FILE = AF_LOCAL;
+pub const AF_INET = PF_INET;
+pub const AF_AX25 = PF_AX25;
+pub const AF_IPX = PF_IPX;
+pub const AF_APPLETALK = PF_APPLETALK;
+pub const AF_NETROM = PF_NETROM;
+pub const AF_BRIDGE = PF_BRIDGE;
+pub const AF_ATMPVC = PF_ATMPVC;
+pub const AF_X25 = PF_X25;
+pub const AF_INET6 = PF_INET6;
+pub const AF_ROSE = PF_ROSE;
+pub const AF_DECnet = PF_DECnet;
+pub const AF_NETBEUI = PF_NETBEUI;
+pub const AF_SECURITY = PF_SECURITY;
+pub const AF_KEY = PF_KEY;
+pub const AF_NETLINK = PF_NETLINK;
+pub const AF_ROUTE = PF_ROUTE;
+pub const AF_PACKET = PF_PACKET;
+pub const AF_ASH = PF_ASH;
+pub const AF_ECONET = PF_ECONET;
+pub const AF_ATMSVC = PF_ATMSVC;
+pub const AF_RDS = PF_RDS;
+pub const AF_SNA = PF_SNA;
+pub const AF_IRDA = PF_IRDA;
+pub const AF_PPPOX = PF_PPPOX;
+pub const AF_WANPIPE = PF_WANPIPE;
+pub const AF_LLC = PF_LLC;
+pub const AF_IB = PF_IB;
+pub const AF_MPLS = PF_MPLS;
+pub const AF_CAN = PF_CAN;
+pub const AF_TIPC = PF_TIPC;
+pub const AF_BLUETOOTH = PF_BLUETOOTH;
+pub const AF_IUCV = PF_IUCV;
+pub const AF_RXRPC = PF_RXRPC;
+pub const AF_ISDN = PF_ISDN;
+pub const AF_PHONET = PF_PHONET;
+pub const AF_IEEE802154 = PF_IEEE802154;
+pub const AF_CAIF = PF_CAIF;
+pub const AF_ALG = PF_ALG;
+pub const AF_NFC = PF_NFC;
+pub const AF_VSOCK = PF_VSOCK;
+pub const AF_MAX = PF_MAX;
+
+pub const DT_UNKNOWN = 0;
+pub const DT_FIFO = 1;
+pub const DT_CHR = 2;
+pub const DT_DIR = 4;
+pub const DT_BLK = 6;
+pub const DT_REG = 8;
+pub const DT_LNK = 10;
+pub const DT_SOCK = 12;
+pub const DT_WHT = 14;
+
+pub const TCGETS = 0x5401;
+pub const TCSETS = 0x5402;
+pub const TCSETSW = 0x5403;
+pub const TCSETSF = 0x5404;
+pub const TCGETA = 0x5405;
+pub const TCSETA = 0x5406;
+pub const TCSETAW = 0x5407;
+pub const TCSETAF = 0x5408;
+pub const TCSBRK = 0x5409;
+pub const TCXONC = 0x540A;
+pub const TCFLSH = 0x540B;
+pub const TIOCEXCL = 0x540C;
+pub const TIOCNXCL = 0x540D;
+pub const TIOCSCTTY = 0x540E;
+pub const TIOCGPGRP = 0x540F;
+pub const TIOCSPGRP = 0x5410;
+pub const TIOCOUTQ = 0x5411;
+pub const TIOCSTI = 0x5412;
+pub const TIOCGWINSZ = 0x5413;
+pub const TIOCSWINSZ = 0x5414;
+pub const TIOCMGET = 0x5415;
+pub const TIOCMBIS = 0x5416;
+pub const TIOCMBIC = 0x5417;
+pub const TIOCMSET = 0x5418;
+pub const TIOCGSOFTCAR = 0x5419;
+pub const TIOCSSOFTCAR = 0x541A;
+pub const FIONREAD = 0x541B;
+pub const TIOCINQ = FIONREAD;
+pub const TIOCLINUX = 0x541C;
+pub const TIOCCONS = 0x541D;
+pub const TIOCGSERIAL = 0x541E;
+pub const TIOCSSERIAL = 0x541F;
+pub const TIOCPKT = 0x5420;
+pub const FIONBIO = 0x5421;
+pub const TIOCNOTTY = 0x5422;
+pub const TIOCSETD = 0x5423;
+pub const TIOCGETD = 0x5424;
+pub const TCSBRKP = 0x5425;
+pub const TIOCSBRK = 0x5427;
+pub const TIOCCBRK = 0x5428;
+pub const TIOCGSID = 0x5429;
+pub const TIOCGRS485 = 0x542E;
+pub const TIOCSRS485 = 0x542F;
+pub const TIOCGPTN = 0x80045430;
+pub const TIOCSPTLCK = 0x40045431;
+pub const TIOCGDEV = 0x80045432;
+pub const TCGETX = 0x5432;
+pub const TCSETX = 0x5433;
+pub const TCSETXF = 0x5434;
+pub const TCSETXW = 0x5435;
+pub const TIOCSIG = 0x40045436;
+pub const TIOCVHANGUP = 0x5437;
+pub const TIOCGPKT = 0x80045438;
+pub const TIOCGPTLCK = 0x80045439;
+pub const TIOCGEXCL = 0x80045440;
+
+fn unsigned(s: i32) u32 {
+    return @bitCast(u32, s);
+}
+fn signed(s: u32) i32 {
+    return @bitCast(i32, s);
+}
+pub fn WEXITSTATUS(s: i32) i32 {
+    return signed((unsigned(s) & 0xff00) >> 8);
+}
+pub fn WTERMSIG(s: i32) i32 {
+    return signed(unsigned(s) & 0x7f);
+}
+pub fn WSTOPSIG(s: i32) i32 {
+    return WEXITSTATUS(s);
+}
+pub fn WIFEXITED(s: i32) bool {
+    return WTERMSIG(s) == 0;
+}
+pub fn WIFSTOPPED(s: i32) bool {
+    return @intCast(u16, (((unsigned(s) & 0xffff) *% 0x10001) >> 8)) > 0x7f00;
+}
+pub fn WIFSIGNALED(s: i32) bool {
+    return (unsigned(s) & 0xffff) -% 1 < 0xff;
+}
+
+pub const winsize = extern struct.{
+    ws_row: u16,
+    ws_col: u16,
+    ws_xpixel: u16,
+    ws_ypixel: u16,
+};
+
+/// Get the errno from a syscall return value, or 0 for no error.
+pub fn getErrno(r: usize) usize {
+    const signed_r = @bitCast(isize, r);
+    return if (signed_r > -4096 and signed_r < 0) @intCast(usize, -signed_r) else 0;
+}
+
+pub fn dup2(old: i32, new: i32) usize {
+    return arch.syscall2(arch.SYS_dup2, @intCast(usize, old), @intCast(usize, new));
+}
+
+pub fn chdir(path: [*]const u8) usize {
+    return arch.syscall1(arch.SYS_chdir, @ptrToInt(path));
+}
+
+pub fn execve(path: [*]const u8, argv: [*]const ?[*]const u8, envp: [*]const ?[*]const u8) usize {
+    return arch.syscall3(arch.SYS_execve, @ptrToInt(path), @ptrToInt(argv), @ptrToInt(envp));
+}
+
+pub fn fork() usize {
+    return arch.syscall0(arch.SYS_fork);
+}
+
+pub fn getcwd(buf: [*]u8, size: usize) usize {
+    return arch.syscall2(arch.SYS___getcwd, @ptrToInt(buf), size);
+}
+
+pub fn getdents(fd: i32, dirp: [*]u8, count: usize) usize {
+    return arch.syscall3(arch.SYS_getdents, @intCast(usize, fd), @ptrToInt(dirp), count);
+}
+
+pub fn isatty(fd: i32) bool {
+    var wsz: winsize = undefined;
+    return arch.syscall3(arch.SYS_ioctl, @intCast(usize, fd), TIOCGWINSZ, @ptrToInt(&wsz)) == 0;
+}
+
+pub fn readlink(noalias path: [*]const u8, noalias buf_ptr: [*]u8, buf_len: usize) usize {
+    return arch.syscall3(arch.SYS_readlink, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len);
+}
+
+pub fn mkdir(path: [*]const u8, mode: u32) usize {
+    return arch.syscall2(arch.SYS_mkdir, @ptrToInt(path), mode);
+}
+
+pub fn mmap(address: ?*u8, length: usize, prot: usize, flags: usize, fd: i32, offset: isize) usize {
+    return arch.syscall6(arch.SYS_mmap, @ptrToInt(address), length, prot, flags, @intCast(usize, fd), @bitCast(usize, offset));
+}
+
+pub fn munmap(address: usize, length: usize) usize {
+    return arch.syscall2(arch.SYS_munmap, address, length);
+}
+
+pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
+    return arch.syscall3(arch.SYS_read, @intCast(usize, fd), @ptrToInt(buf), count);
+}
+
+pub fn rmdir(path: [*]const u8) usize {
+    return arch.syscall1(arch.SYS_rmdir, @ptrToInt(path));
+}
+
+pub fn symlink(existing: [*]const u8, new: [*]const u8) usize {
+    return arch.syscall2(arch.SYS_symlink, @ptrToInt(existing), @ptrToInt(new));
+}
+
+pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: usize) usize {
+    return arch.syscall4(arch.SYS_pread, usize(fd), @ptrToInt(buf), count, offset);
+}
+
+pub fn pipe(fd: *[2]i32) usize {
+    return pipe2(fd, 0);
+}
+
+pub fn pipe2(fd: *[2]i32, flags: usize) usize {
+    return arch.syscall2(arch.SYS_pipe2, @ptrToInt(fd), flags);
+}
+
+pub fn write(fd: i32, buf: [*]const u8, count: usize) usize {
+    return arch.syscall3(arch.SYS_write, @intCast(usize, fd), @ptrToInt(buf), count);
+}
+
+pub fn pwrite(fd: i32, buf: [*]const u8, count: usize, offset: usize) usize {
+    return arch.syscall4(arch.SYS_pwrite, @intCast(usize, fd), @ptrToInt(buf), count, offset);
+}
+
+pub fn rename(old: [*]const u8, new: [*]const u8) usize {
+    return arch.syscall2(arch.SYS_rename, @ptrToInt(old), @ptrToInt(new));
+}
+
+pub fn open(path: [*]const u8, flags: u32, perm: usize) usize {
+    return arch.syscall3(arch.SYS_open, @ptrToInt(path), flags, perm);
+}
+
+pub fn create(path: [*]const u8, perm: usize) usize {
+    return arch.syscall2(arch.SYS_creat, @ptrToInt(path), perm);
+}
+
+pub fn openat(dirfd: i32, path: [*]const u8, flags: usize, mode: usize) usize {
+    return arch.syscall4(arch.SYS_openat, @intCast(usize, dirfd), @ptrToInt(path), flags, mode);
+}
+
+pub fn close(fd: i32) usize {
+    return arch.syscall1(arch.SYS_close, @intCast(usize, fd));
+}
+
+pub fn lseek(fd: i32, offset: isize, ref_pos: usize) usize {
+    return arch.syscall3(arch.SYS_lseek, @intCast(usize, fd), @bitCast(usize, offset), ref_pos);
+}
+
+pub fn exit(status: i32) noreturn {
+    _ = arch.syscall1(arch.SYS_exit, @bitCast(usize, isize(status)));
+    unreachable;
+}
+
+pub fn getrandom(buf: [*]u8, count: usize, flags: u32) usize {
+    return arch.syscall3(arch.SYS_getrandom, @ptrToInt(buf), count, @intCast(usize, flags));
+}
+
+pub fn kill(pid: i32, sig: i32) usize {
+    return arch.syscall2(arch.SYS_kill, @bitCast(usize, @intCast(isize, pid)), @intCast(usize, sig));
+}
+
+pub fn unlink(path: [*]const u8) usize {
+    return arch.syscall1(arch.SYS_unlink, @ptrToInt(path));
+}
+
+pub fn waitpid(pid: i32, status: *i32, options: i32) usize {
+    return arch.syscall4(arch.SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), @bitCast(usize, isize(options)), 0);
+}
+
+pub fn nanosleep(req: *const timespec, rem: ?*timespec) usize {
+    return arch.syscall2(arch.SYS_nanosleep, @ptrToInt(req), @ptrToInt(rem));
+}
+
+pub fn setuid(uid: u32) usize {
+    return arch.syscall1(arch.SYS_setuid, uid);
+}
+
+pub fn setgid(gid: u32) usize {
+    return arch.syscall1(arch.SYS_setgid, gid);
+}
+
+pub fn setreuid(ruid: u32, euid: u32) usize {
+    return arch.syscall2(arch.SYS_setreuid, ruid, euid);
+}
+
+pub fn setregid(rgid: u32, egid: u32) usize {
+    return arch.syscall2(arch.SYS_setregid, rgid, egid);
+}
+
+pub fn sigprocmask(flags: u32, noalias set: *const sigset_t, noalias oldset: ?*sigset_t) usize {
+    // TODO: Implement
+    return 0;
+}
+
+pub fn sigaction(sig: u6, noalias act: *const Sigaction, noalias oact: ?*Sigaction) usize {
+    // TODO: Implement
+    return 0;
+}
+
+const NSIG = 65;
+const sigset_t = [128 / @sizeOf(usize)]usize;
+const all_mask = []usize.{@maxValue(usize)};
+const app_mask = []usize.{0xfffffffc7fffffff};
+
+/// Renamed from `sigaction` to `Sigaction` to avoid conflict with the syscall.
+pub const Sigaction = struct.{
+    // TODO: Adjust to use freebsd struct layout
+    handler: extern fn (i32) void,
+    mask: sigset_t,
+    flags: u32,
+};
+
+pub const SIG_ERR = @intToPtr(extern fn (i32) void, @maxValue(usize));
+pub const SIG_DFL = @intToPtr(extern fn (i32) void, 0);
+pub const SIG_IGN = @intToPtr(extern fn (i32) void, 1);
+pub const empty_sigset = []usize.{0} ** sigset_t.len;
+
+pub fn raise(sig: i32) usize {
+    // TODO implement, see linux equivalent for what we want to try and do
+    return 0;
+}
+
+fn blockAllSignals(set: *sigset_t) void {
+    // TODO implement
+}
+
+fn blockAppSignals(set: *sigset_t) void {
+    // TODO implement
+}
+
+fn restoreSignals(set: *sigset_t) void {
+    // TODO implement
+}
+
+pub fn sigaddset(set: *sigset_t, sig: u6) void {
+    const s = sig - 1;
+    (*set)[usize(s) / usize.bit_count] |= usize(1) << (s & (usize.bit_count - 1));
+}
+
+pub fn sigismember(set: *const sigset_t, sig: u6) bool {
+    const s = sig - 1;
+    return ((*set)[usize(s) / usize.bit_count] & (usize(1) << (s & (usize.bit_count - 1)))) != 0;
+}
+
+pub const Stat = arch.Stat;
+pub const timespec = arch.timespec;
+
+pub fn fstat(fd: i32, stat_buf: *Stat) usize {
+    return arch.syscall2(arch.SYS_fstat, @intCast(usize, fd), @ptrToInt(stat_buf));
+}
diff --git a/std/os/freebsd/x86_64.zig b/std/os/freebsd/x86_64.zig
new file mode 100644
index 0000000000000000000000000000000000000000..cd9104b88a0f452749e743e2e5b5b2580b831a67
--- /dev/null
+++ b/std/os/freebsd/x86_64.zig
@@ -0,0 +1,651 @@
+const freebsd = @import("index.zig");
+const socklen_t = freebsd.socklen_t;
+const iovec = freebsd.iovec;
+
+pub const SYS_syscall = 0;
+pub const SYS_exit = 1;
+pub const SYS_fork = 2;
+pub const SYS_read = 3;
+pub const SYS_write = 4;
+pub const SYS_open = 5;
+pub const SYS_close = 6;
+pub const SYS_wait4 = 7;
+// 8 is old creat
+pub const SYS_link = 9;
+pub const SYS_unlink = 10;
+// 11 is obsolete execv
+pub const SYS_chdir = 12;
+pub const SYS_fchdir = 13;
+pub const SYS_freebsd11_mknod = 14;
+pub const SYS_chmod = 15;
+pub const SYS_chown = 16;
+pub const SYS_break = 17;
+// 18 is freebsd4 getfsstat
+// 19 is old lseek
+pub const SYS_getpid = 20;
+pub const SYS_mount = 21;
+pub const SYS_unmount = 22;
+pub const SYS_setuid = 23;
+pub const SYS_getuid = 24;
+pub const SYS_geteuid = 25;
+pub const SYS_ptrace = 26;
+pub const SYS_recvmsg = 27;
+pub const SYS_sendmsg = 28;
+pub const SYS_recvfrom = 29;
+pub const SYS_accept = 30;
+pub const SYS_getpeername = 31;
+pub const SYS_getsockname = 32;
+pub const SYS_access = 33;
+pub const SYS_chflags = 34;
+pub const SYS_fchflags = 35;
+pub const SYS_sync = 36;
+pub const SYS_kill = 37;
+// 38 is old stat
+pub const SYS_getppid = 39;
+// 40 is old lstat
+pub const SYS_dup = 41;
+pub const SYS_freebsd10_pipe = 42;
+pub const SYS_getegid = 43;
+pub const SYS_profil = 44;
+pub const SYS_ktrace = 45;
+// 46 is old sigaction
+pub const SYS_getgid = 47;
+// 48 is old sigprocmask
+pub const SYS_getlogin = 49;
+pub const SYS_setlogin = 50;
+pub const SYS_acct = 51;
+// 52 is old sigpending
+pub const SYS_sigaltstack = 53;
+pub const SYS_ioctl = 54;
+pub const SYS_reboot = 55;
+pub const SYS_revoke = 56;
+pub const SYS_symlink = 57;
+pub const SYS_readlink = 58;
+pub const SYS_execve = 59;
+pub const SYS_umask = 60;
+pub const SYS_chroot = 61;
+// 62 is old fstat
+// 63 is old getkerninfo
+// 64 is old getpagesize
+pub const SYS_msync = 65;
+pub const SYS_vfork = 66;
+// 67 is obsolete vread
+// 68 is obsolete vwrite
+pub const SYS_sbrk = 69;
+pub const SYS_sstk = 70;
+// 71 is old mmap
+pub const SYS_vadvise = 72;
+pub const SYS_munmap = 73;
+pub const SYS_mprotect = 74;
+pub const SYS_madvise = 75;
+// 76 is obsolete vhangup
+// 77 is obsolete vlimit
+pub const SYS_mincore = 78;
+pub const SYS_getgroups = 79;
+pub const SYS_setgroups = 80;
+pub const SYS_getpgrp = 81;
+pub const SYS_setpgid = 82;
+pub const SYS_setitimer = 83;
+// 84 is old wait
+pub const SYS_swapon = 85;
+pub const SYS_getitimer = 86;
+// 87 is old gethostname
+// 88 is old sethostname
+pub const SYS_getdtablesize = 89;
+pub const SYS_dup2 = 90;
+pub const SYS_fcntl = 92;
+pub const SYS_select = 93;
+pub const SYS_fsync = 95;
+pub const SYS_setpriority = 96;
+pub const SYS_socket = 97;
+pub const SYS_connect = 98;
+// 99 is old accept
+pub const SYS_getpriority = 100;
+// 101 is old send
+// 102 is old recv
+// 103 is old sigreturn
+pub const SYS_bind = 104;
+pub const SYS_setsockopt = 105;
+pub const SYS_listen = 106;
+// 107 is obsolete vtimes
+// 108 is old sigvec
+// 109 is old sigblock
+// 110 is old sigsetmask
+// 111 is old sigsuspend
+// 112 is old sigstack
+// 113 is old recvmsg
+// 114 is old sendmsg
+// 115 is obsolete vtrace
+pub const SYS_gettimeofday = 116;
+pub const SYS_getrusage = 117;
+pub const SYS_getsockopt = 118;
+pub const SYS_readv = 120;
+pub const SYS_writev = 121;
+pub const SYS_settimeofday = 122;
+pub const SYS_fchown = 123;
+pub const SYS_fchmod = 124;
+// 125 is old recvfrom
+pub const SYS_setreuid = 126;
+pub const SYS_setregid = 127;
+pub const SYS_rename = 128;
+// 129 is old truncate
+// 130 is old ftruncate
+pub const SYS_flock = 131;
+pub const SYS_mkfifo = 132;
+pub const SYS_sendto = 133;
+pub const SYS_shutdown = 134;
+pub const SYS_socketpair = 135;
+pub const SYS_mkdir = 136;
+pub const SYS_rmdir = 137;
+pub const SYS_utimes = 138;
+// 139 is obsolete 4.2 sigreturn
+pub const SYS_adjtime = 140;
+// 141 is old getpeername
+// 142 is old gethostid
+// 143 is old sethostid
+// 144 is old getrlimit
+// 145 is old setrlimit
+// 146 is old killpg
+pub const SYS_setsid = 147;
+pub const SYS_quotactl = 148;
+// 149 is old quota
+// 150 is old getsockname
+pub const SYS_nlm_syscall = 154;
+pub const SYS_nfssvc = 155;
+// 156 is old getdirentries
+// 157 is freebsd4 statfs
+// 158 is freebsd4 fstatfs
+pub const SYS_lgetfh = 160;
+pub const SYS_getfh = 161;
+// 162 is freebsd4 getdomainname
+// 163 is freebsd4 setdomainname
+// 164 is freebsd4 uname
+pub const SYS_sysarch = 165;
+pub const SYS_rtprio = 166;
+pub const SYS_semsys = 169;
+pub const SYS_msgsys = 170;
+pub const SYS_shmsys = 171;
+// 173 is freebsd6 pread
+// 174 is freebsd6 pwrite
+pub const SYS_setfib = 175;
+pub const SYS_ntp_adjtime = 176;
+pub const SYS_setgid = 181;
+pub const SYS_setegid = 182;
+pub const SYS_seteuid = 183;
+pub const SYS_freebsd11_stat = 188;
+pub const SYS_freebsd11_fstat = 189;
+pub const SYS_freebsd11_lstat = 190;
+pub const SYS_pathconf = 191;
+pub const SYS_fpathconf = 192;
+pub const SYS_getrlimit = 194;
+pub const SYS_setrlimit = 195;
+pub const SYS_freebsd11_getdirentries = 196;
+// 197 is freebsd6 mmap
+pub const SYS___syscall = 198;
+// 199 is freebsd6 lseek
+// 200 is freebsd6 truncate
+// 201 is freebsd6 ftruncate
+pub const SYS___sysctl = 202;
+pub const SYS_mlock = 203;
+pub const SYS_munlock = 204;
+pub const SYS_undelete = 205;
+pub const SYS_futimes = 206;
+pub const SYS_getpgid = 207;
+pub const SYS_poll = 209;
+pub const SYS_freebsd7___semctl = 220;
+pub const SYS_semget = 221;
+pub const SYS_semop = 222;
+pub const SYS_freebsd7_msgctl = 224;
+pub const SYS_msgget = 225;
+pub const SYS_msgsnd = 226;
+pub const SYS_msgrcv = 227;
+pub const SYS_shmat = 228;
+pub const SYS_freebsd7_shmctl = 229;
+pub const SYS_shmdt = 230;
+pub const SYS_shmget = 231;
+pub const SYS_clock_gettime = 232;
+pub const SYS_clock_settime = 233;
+pub const SYS_clock_getres = 234;
+pub const SYS_ktimer_create = 235;
+pub const SYS_ktimer_delete = 236;
+pub const SYS_ktimer_settime = 237;
+pub const SYS_ktimer_gettime = 238;
+pub const SYS_ktimer_getoverrun = 239;
+pub const SYS_nanosleep = 240;
+pub const SYS_ffclock_getcounter = 241;
+pub const SYS_ffclock_setestimate = 242;
+pub const SYS_ffclock_getestimate = 243;
+pub const SYS_clock_nanosleep = 244;
+pub const SYS_clock_getcpuclockid2 = 247;
+pub const SYS_ntp_gettime = 248;
+pub const SYS_minherit = 250;
+pub const SYS_rfork = 251;
+// 252 is obsolete openbsd_poll
+pub const SYS_issetugid = 253;
+pub const SYS_lchown = 254;
+pub const SYS_aio_read = 255;
+pub const SYS_aio_write = 256;
+pub const SYS_lio_listio = 257;
+pub const SYS_freebsd11_getdents = 272;
+pub const SYS_lchmod = 274;
+pub const SYS_netbsd_lchown = 275;
+pub const SYS_lutimes = 276;
+pub const SYS_netbsd_msync = 277;
+pub const SYS_freebsd11_nstat = 278;
+pub const SYS_freebsd11_nfstat = 279;
+pub const SYS_freebsd11_nlstat = 280;
+pub const SYS_preadv = 289;
+pub const SYS_pwritev = 290;
+// 297 is freebsd4 fhstatfs
+pub const SYS_fhopen = 298;
+pub const SYS_freebsd11_fhstat = 299;
+pub const SYS_modnext = 300;
+pub const SYS_modstat = 301;
+pub const SYS_modfnext = 302;
+pub const SYS_modfind = 303;
+pub const SYS_kldload = 304;
+pub const SYS_kldunload = 305;
+pub const SYS_kldfind = 306;
+pub const SYS_kldnext = 307;
+pub const SYS_kldstat = 308;
+pub const SYS_kldfirstmod = 309;
+pub const SYS_getsid = 310;
+pub const SYS_setresuid = 311;
+pub const SYS_setresgid = 312;
+// 313 is obsolete signanosleep
+pub const SYS_aio_return = 314;
+pub const SYS_aio_suspend = 315;
+pub const SYS_aio_cancel = 316;
+pub const SYS_aio_error = 317;
+// 318 is freebsd6 aio_read
+// 319 is freebsd6 aio_write
+// 320 is freebsd6 lio_listio
+pub const SYS_yield = 321;
+// 322 is obsolete thr_sleep
+// 323 is obsolete thr_wakeup
+pub const SYS_mlockall = 324;
+pub const SYS_munlockall = 325;
+pub const SYS___getcwd = 326;
+pub const SYS_sched_setparam = 327;
+pub const SYS_sched_getparam = 328;
+pub const SYS_sched_setscheduler = 329;
+pub const SYS_sched_getscheduler = 330;
+pub const SYS_sched_yield = 331;
+pub const SYS_sched_get_priority_max = 332;
+pub const SYS_sched_get_priority_min = 333;
+pub const SYS_sched_rr_get_interval = 334;
+pub const SYS_utrace = 335;
+// 336 is freebsd4 sendfile
+pub const SYS_kldsym = 337;
+pub const SYS_jail = 338;
+pub const SYS_nnpfs_syscall = 339;
+pub const SYS_sigprocmask = 340;
+pub const SYS_sigsuspend = 341;
+// 342 is freebsd4 sigaction
+pub const SYS_sigpending = 343;
+// 344 is freebsd4 sigreturn
+pub const SYS_sigtimedwait = 345;
+pub const SYS_sigwaitinfo = 346;
+pub const SYS___acl_get_file = 347;
+pub const SYS___acl_set_file = 348;
+pub const SYS___acl_get_fd = 349;
+pub const SYS___acl_set_fd = 350;
+pub const SYS___acl_delete_file = 351;
+pub const SYS___acl_delete_fd = 352;
+pub const SYS___acl_aclcheck_file = 353;
+pub const SYS___acl_aclcheck_fd = 354;
+pub const SYS_extattrctl = 355;
+pub const SYS_extattr_set_file = 356;
+pub const SYS_extattr_get_file = 357;
+pub const SYS_extattr_delete_file = 358;
+pub const SYS_aio_waitcomplete = 359;
+pub const SYS_getresuid = 360;
+pub const SYS_getresgid = 361;
+pub const SYS_kqueue = 362;
+pub const SYS_freebsd11_kevent = 363;
+pub const SYS_extattr_set_fd = 371;
+pub const SYS_extattr_get_fd = 372;
+pub const SYS_extattr_delete_fd = 373;
+pub const SYS___setugid = 374;
+pub const SYS_eaccess = 376;
+pub const SYS_afs3_syscall = 377;
+pub const SYS_nmount = 378;
+pub const SYS___mac_get_proc = 384;
+pub const SYS___mac_set_proc = 385;
+pub const SYS___mac_get_fd = 386;
+pub const SYS___mac_get_file = 387;
+pub const SYS___mac_set_fd = 388;
+pub const SYS___mac_set_file = 389;
+pub const SYS_kenv = 390;
+pub const SYS_lchflags = 391;
+pub const SYS_uuidgen = 392;
+pub const SYS_sendfile = 393;
+pub const SYS_mac_syscall = 394;
+pub const SYS_freebsd11_getfsstat = 395;
+pub const SYS_freebsd11_statfs = 396;
+pub const SYS_freebsd11_fstatfs = 397;
+pub const SYS_freebsd11_fhstatfs = 398;
+pub const SYS_ksem_close = 400;
+pub const SYS_ksem_post = 401;
+pub const SYS_ksem_wait = 402;
+pub const SYS_ksem_trywait = 403;
+pub const SYS_ksem_init = 404;
+pub const SYS_ksem_open = 405;
+pub const SYS_ksem_unlink = 406;
+pub const SYS_ksem_getvalue = 407;
+pub const SYS_ksem_destroy = 408;
+pub const SYS___mac_get_pid = 409;
+pub const SYS___mac_get_link = 410;
+pub const SYS___mac_set_link = 411;
+pub const SYS_extattr_set_link = 412;
+pub const SYS_extattr_get_link = 413;
+pub const SYS_extattr_delete_link = 414;
+pub const SYS___mac_execve = 415;
+pub const SYS_sigaction = 416;
+pub const SYS_sigreturn = 417;
+pub const SYS_getcontext = 421;
+pub const SYS_setcontext = 422;
+pub const SYS_swapcontext = 423;
+pub const SYS_swapoff = 424;
+pub const SYS___acl_get_link = 425;
+pub const SYS___acl_set_link = 426;
+pub const SYS___acl_delete_link = 427;
+pub const SYS___acl_aclcheck_link = 428;
+pub const SYS_sigwait = 429;
+pub const SYS_thr_create = 430;
+pub const SYS_thr_exit = 431;
+pub const SYS_thr_self = 432;
+pub const SYS_thr_kill = 433;
+pub const SYS_jail_attach = 436;
+pub const SYS_extattr_list_fd = 437;
+pub const SYS_extattr_list_file = 438;
+pub const SYS_extattr_list_link = 439;
+pub const SYS_ksem_timedwait = 441;
+pub const SYS_thr_suspend = 442;
+pub const SYS_thr_wake = 443;
+pub const SYS_kldunloadf = 444;
+pub const SYS_audit = 445;
+pub const SYS_auditon = 446;
+pub const SYS_getauid = 447;
+pub const SYS_setauid = 448;
+pub const SYS_getaudit = 449;
+pub const SYS_setaudit = 450;
+pub const SYS_getaudit_addr = 451;
+pub const SYS_setaudit_addr = 452;
+pub const SYS_auditctl = 453;
+pub const SYS__umtx_op = 454;
+pub const SYS_thr_new = 455;
+pub const SYS_sigqueue = 456;
+pub const SYS_kmq_open = 457;
+pub const SYS_kmq_setattr = 458;
+pub const SYS_kmq_timedreceive = 459;
+pub const SYS_kmq_timedsend = 460;
+pub const SYS_kmq_notify = 461;
+pub const SYS_kmq_unlink = 462;
+pub const SYS_abort2 = 463;
+pub const SYS_thr_set_name = 464;
+pub const SYS_aio_fsync = 465;
+pub const SYS_rtprio_thread = 466;
+pub const SYS_sctp_peeloff = 471;
+pub const SYS_sctp_generic_sendmsg = 472;
+pub const SYS_sctp_generic_sendmsg_iov = 473;
+pub const SYS_sctp_generic_recvmsg = 474;
+pub const SYS_pread = 475;
+pub const SYS_pwrite = 476;
+pub const SYS_mmap = 477;
+pub const SYS_lseek = 478;
+pub const SYS_truncate = 479;
+pub const SYS_ftruncate = 480;
+pub const SYS_thr_kill2 = 481;
+pub const SYS_shm_open = 482;
+pub const SYS_shm_unlink = 483;
+pub const SYS_cpuset = 484;
+pub const SYS_cpuset_setid = 485;
+pub const SYS_cpuset_getid = 486;
+pub const SYS_cpuset_getaffinity = 487;
+pub const SYS_cpuset_setaffinity = 488;
+pub const SYS_faccessat = 489;
+pub const SYS_fchmodat = 490;
+pub const SYS_fchownat = 491;
+pub const SYS_fexecve = 492;
+pub const SYS_freebsd11_fstatat = 493;
+pub const SYS_futimesat = 494;
+pub const SYS_linkat = 495;
+pub const SYS_mkdirat = 496;
+pub const SYS_mkfifoat = 497;
+pub const SYS_freebsd11_mknodat = 498;
+pub const SYS_openat = 499;
+pub const SYS_readlinkat = 500;
+pub const SYS_renameat = 501;
+pub const SYS_symlinkat = 502;
+pub const SYS_unlinkat = 503;
+pub const SYS_posix_openpt = 504;
+pub const SYS_gssd_syscall = 505;
+pub const SYS_jail_get = 506;
+pub const SYS_jail_set = 507;
+pub const SYS_jail_remove = 508;
+pub const SYS_closefrom = 509;
+pub const SYS___semctl = 510;
+pub const SYS_msgctl = 511;
+pub const SYS_shmctl = 512;
+pub const SYS_lpathconf = 513;
+// 514 is obsolete cap_new
+pub const SYS___cap_rights_get = 515;
+pub const SYS_cap_enter = 516;
+pub const SYS_cap_getmode = 517;
+pub const SYS_pdfork = 518;
+pub const SYS_pdkill = 519;
+pub const SYS_pdgetpid = 520;
+pub const SYS_pselect = 522;
+pub const SYS_getloginclass = 523;
+pub const SYS_setloginclass = 524;
+pub const SYS_rctl_get_racct = 525;
+pub const SYS_rctl_get_rules = 526;
+pub const SYS_rctl_get_limits = 527;
+pub const SYS_rctl_add_rule = 528;
+pub const SYS_rctl_remove_rule = 529;
+pub const SYS_posix_fallocate = 530;
+pub const SYS_posix_fadvise = 531;
+pub const SYS_wait6 = 532;
+pub const SYS_cap_rights_limit = 533;
+pub const SYS_cap_ioctls_limit = 534;
+pub const SYS_cap_ioctls_get = 535;
+pub const SYS_cap_fcntls_limit = 536;
+pub const SYS_cap_fcntls_get = 537;
+pub const SYS_bindat = 538;
+pub const SYS_connectat = 539;
+pub const SYS_chflagsat = 540;
+pub const SYS_accept4 = 541;
+pub const SYS_pipe2 = 542;
+pub const SYS_aio_mlock = 543;
+pub const SYS_procctl = 544;
+pub const SYS_ppoll = 545;
+pub const SYS_futimens = 546;
+pub const SYS_utimensat = 547;
+pub const SYS_numa_getaffinity = 548;
+pub const SYS_numa_setaffinity = 549;
+pub const SYS_fdatasync = 550;
+pub const SYS_fstat = 551;
+pub const SYS_fstatat = 552;
+pub const SYS_fhstat = 553;
+pub const SYS_getdirentries = 554;
+pub const SYS_statfs = 555;
+pub const SYS_fstatfs = 556;
+pub const SYS_getfsstat = 557;
+pub const SYS_fhstatfs = 558;
+pub const SYS_mknodat = 559;
+pub const SYS_kevent = 560;
+pub const SYS_MAXSYSCALL = 561;
+pub const SYS_getrandom = 563;
+
+pub const O_CREAT = 0o100;
+pub const O_EXCL = 0o200;
+pub const O_NOCTTY = 0o400;
+pub const O_TRUNC = 0o1000;
+pub const O_APPEND = 0o2000;
+pub const O_NONBLOCK = 0o4000;
+pub const O_DSYNC = 0o10000;
+pub const O_SYNC = 0o4010000;
+pub const O_RSYNC = 0o4010000;
+pub const O_DIRECTORY = 0o200000;
+pub const O_NOFOLLOW = 0o400000;
+pub const O_CLOEXEC = 0o2000000;
+
+pub const O_ASYNC = 0o20000;
+pub const O_DIRECT = 0o40000;
+pub const O_LARGEFILE = 0;
+pub const O_NOATIME = 0o1000000;
+pub const O_PATH = 0o10000000;
+pub const O_TMPFILE = 0o20200000;
+pub const O_NDELAY = O_NONBLOCK;
+
+pub const F_DUPFD = 0;
+pub const F_GETFD = 1;
+pub const F_SETFD = 2;
+pub const F_GETFL = 3;
+pub const F_SETFL = 4;
+
+pub const F_SETOWN = 8;
+pub const F_GETOWN = 9;
+pub const F_SETSIG = 10;
+pub const F_GETSIG = 11;
+
+pub const F_GETLK = 5;
+pub const F_SETLK = 6;
+pub const F_SETLKW = 7;
+
+pub const F_SETOWN_EX = 15;
+pub const F_GETOWN_EX = 16;
+
+pub const F_GETOWNER_UIDS = 17;
+
+pub fn syscall0(number: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall1(number: usize, arg1: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1),
+          [arg2] "{rsi}" (arg2)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1),
+          [arg2] "{rsi}" (arg2),
+          [arg3] "{rdx}" (arg3)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1),
+          [arg2] "{rsi}" (arg2),
+          [arg3] "{rdx}" (arg3),
+          [arg4] "{r10}" (arg4)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1),
+          [arg2] "{rsi}" (arg2),
+          [arg3] "{rdx}" (arg3),
+          [arg4] "{r10}" (arg4),
+          [arg5] "{r8}" (arg5)
+        : "rcx", "r11"
+    );
+}
+
+pub fn syscall6(
+    number: usize,
+    arg1: usize,
+    arg2: usize,
+    arg3: usize,
+    arg4: usize,
+    arg5: usize,
+    arg6: usize,
+) usize {
+    return asm volatile ("syscall"
+        : [ret] "={rax}" (-> usize)
+        : [number] "{rax}" (number),
+          [arg1] "{rdi}" (arg1),
+          [arg2] "{rsi}" (arg2),
+          [arg3] "{rdx}" (arg3),
+          [arg4] "{r10}" (arg4),
+          [arg5] "{r8}" (arg5),
+          [arg6] "{r9}" (arg6)
+        : "rcx", "r11"
+    );
+}
+
+pub nakedcc fn restore_rt() void {
+    asm volatile ("syscall"
+        :
+        : [number] "{rax}" (usize(SYS_rt_sigreturn))
+        : "rcx", "r11"
+    );
+}
+
+pub const msghdr = extern struct.{
+    msg_name: &u8,
+    msg_namelen: socklen_t,
+    msg_iov: &iovec,
+    msg_iovlen: i32,
+    __pad1: i32,
+    msg_control: &u8,
+    msg_controllen: socklen_t,
+    __pad2: socklen_t,
+    msg_flags: i32,
+};
+
+/// Renamed to Stat to not conflict with the stat function.
+pub const Stat = extern struct.{
+    dev: u64,
+    ino: u64,
+    nlink: usize,
+
+    mode: u32,
+    uid: u32,
+    gid: u32,
+    __pad0: u32,
+    rdev: u64,
+    size: i64,
+    blksize: isize,
+    blocks: i64,
+
+    atim: timespec,
+    mtim: timespec,
+    ctim: timespec,
+    __unused: [3]isize,
+};
+
+pub const timespec = extern struct.{
+    tv_sec: isize,
+    tv_nsec: isize,
+};
diff --git a/std/os/freebsd_errno.zig b/std/os/freebsd_errno.zig
deleted file mode 100644
index 0a0d825f5ac368652284e913b0294812ac6fdff7..0000000000000000000000000000000000000000
--- a/std/os/freebsd_errno.zig
+++ /dev/null
@@ -1,121 +0,0 @@
-pub const EPERM = 1; // Operation not permitted
-pub const ENOENT = 2; // No such file or directory
-pub const ESRCH = 3; // No such process
-pub const EINTR = 4; // Interrupted system call
-pub const EIO = 5; // Input/output error
-pub const ENXIO = 6; // Device not configured
-pub const E2BIG = 7; // Argument list too long
-pub const ENOEXEC = 8; // Exec format error
-pub const EBADF = 9; // Bad file descriptor
-pub const ECHILD = 10; // No child processes
-pub const EDEADLK = 11; // Resource deadlock avoided
-// 11 was EAGAIN
-pub const ENOMEM = 12; // Cannot allocate memory
-pub const EACCES = 13; // Permission denied
-pub const EFAULT = 14; // Bad address
-pub const ENOTBLK = 15; // Block device required
-pub const EBUSY = 16; // Device busy
-pub const EEXIST = 17; // File exists
-pub const EXDEV = 18; // Cross-device link
-pub const ENODEV = 19; // Operation not supported by device
-pub const ENOTDIR = 20; // Not a directory
-pub const EISDIR = 21; // Is a directory
-pub const EINVAL = 22; // Invalid argument
-pub const ENFILE = 23; // Too many open files in system
-pub const EMFILE = 24; // Too many open files
-pub const ENOTTY = 25; // Inappropriate ioctl for device
-pub const ETXTBSY = 26; // Text file busy
-pub const EFBIG = 27; // File too large
-pub const ENOSPC = 28; // No space left on device
-pub const ESPIPE = 29; // Illegal seek
-pub const EROFS = 30; // Read-only filesystem
-pub const EMLINK = 31; // Too many links
-pub const EPIPE = 32; // Broken pipe
-
-// math software
-pub const EDOM = 33; // Numerical argument out of domain
-pub const ERANGE = 34; // Result too large
-
-// non-blocking and interrupt i/o
-pub const EAGAIN = 35; // Resource temporarily unavailable
-pub const EWOULDBLOCK = EAGAIN; // Operation would block
-pub const EINPROGRESS = 36; // Operation now in progress
-pub const EALREADY = 37; // Operation already in progress
-
-// ipc/network software -- argument errors
-pub const ENOTSOCK = 38; // Socket operation on non-socket
-pub const EDESTADDRREQ = 39; // Destination address required
-pub const EMSGSIZE = 40; // Message too long
-pub const EPROTOTYPE = 41; // Protocol wrong type for socket
-pub const ENOPROTOOPT = 42; // Protocol not available
-pub const EPROTONOSUPPORT = 43; // Protocol not supported
-pub const ESOCKTNOSUPPORT = 44; // Socket type not supported
-pub const EOPNOTSUPP = 45; // Operation not supported
-pub const ENOTSUP = EOPNOTSUPP; // Operation not supported
-pub const EPFNOSUPPORT = 46; // Protocol family not supported
-pub const EAFNOSUPPORT = 47; // Address family not supported by protocol family
-pub const EADDRINUSE = 48; // Address already in use
-pub const EADDRNOTAVAIL = 49; // Can't assign requested address
-
-// ipc/network software -- operational errors
-pub const ENETDOWN = 50; // Network is down
-pub const ENETUNREACH = 51; // Network is unreachable
-pub const ENETRESET = 52; // Network dropped connection on reset
-pub const ECONNABORTED = 53; // Software caused connection abort
-pub const ECONNRESET = 54; // Connection reset by peer
-pub const ENOBUFS = 55; // No buffer space available
-pub const EISCONN = 56; // Socket is already connected
-pub const ENOTCONN = 57; // Socket is not connected
-pub const ESHUTDOWN = 58; // Can't send after socket shutdown
-pub const ETOOMANYREFS = 59; // Too many references: can't splice
-pub const ETIMEDOUT = 60; // Operation timed out
-pub const ECONNREFUSED = 61; // Connection refused
-
-pub const ELOOP = 62; // Too many levels of symbolic links
-pub const ENAMETOOLONG = 63; // File name too long
-
-// should be rearranged
-pub const EHOSTDOWN = 64; // Host is down
-pub const EHOSTUNREACH = 65; // No route to host
-pub const ENOTEMPTY = 66; // Directory not empty
-
-// quotas & mush
-pub const EPROCLIM = 67; // Too many processes
-pub const EUSERS = 68; // Too many users
-pub const EDQUOT = 69; // Disc quota exceeded
-
-// Network File System
-pub const ESTALE = 70; // Stale NFS file handle
-pub const EREMOTE = 71; // Too many levels of remote in path
-pub const EBADRPC = 72; // RPC struct is bad
-pub const ERPCMISMATCH = 73; // RPC version wrong
-pub const EPROGUNAVAIL = 74; // RPC prog. not avail
-pub const EPROGMISMATCH = 75; // Program version wrong
-pub const EPROCUNAVAIL = 76; // Bad procedure for program
-
-pub const ENOLCK = 77; // No locks available
-pub const ENOSYS = 78; // Function not implemented
-
-pub const EFTYPE = 79; // Inappropriate file type or format
-pub const EAUTH = 80; // Authentication error
-pub const ENEEDAUTH = 81; // Need authenticator
-pub const EIDRM = 82; // Identifier removed
-pub const ENOMSG = 83; // No message of desired type
-pub const EOVERFLOW = 84; // Value too large to be stored in data type
-pub const ECANCELED = 85; // Operation canceled
-pub const EILSEQ = 86; // Illegal byte sequence
-pub const ENOATTR = 87; // Attribute not found
-
-pub const EDOOFUS = 88; // Programming error
-
-pub const EBADMSG = 89; // Bad message
-pub const EMULTIHOP = 90; // Multihop attempted
-pub const ENOLINK = 91; // Link has been severed
-pub const EPROTO = 92; // Protocol error
-
-pub const ENOTCAPABLE = 93; // Capabilities insufficient
-pub const ECAPMODE = 94; // Not permitted in capability mode
-pub const ENOTRECOVERABLE = 95; // State not recoverable
-pub const EOWNERDEAD = 96; // Previous owner died
-
-pub const ELAST = 96; // Must be equal largest errno
diff --git a/std/os/freebsd_i386.zig b/std/os/freebsd_i386.zig
deleted file mode 100644
index fd1f58639bb617784568759ace08aaefb148d20d..0000000000000000000000000000000000000000
--- a/std/os/freebsd_i386.zig
+++ /dev/null
@@ -1,614 +0,0 @@
-const freebsd = @import("freebsd.zig");
-const socklen_t = freebsd.socklen_t;
-const iovec = freebsd.iovec;
-
-pub const SYS_syscall = 0;
-pub const SYS_exit = 1;
-pub const SYS_fork = 2;
-pub const SYS_read = 3;
-pub const SYS_write = 4;
-pub const SYS_open = 5;
-pub const SYS_close = 6;
-pub const SYS_wait4 = 7;
-// 8 is old creat
-pub const SYS_link = 9;
-pub const SYS_unlink = 10;
-// 11 is obsolete execv
-pub const SYS_chdir = 12;
-pub const SYS_fchdir = 13;
-pub const SYS_freebsd11_mknod = 14;
-pub const SYS_chmod = 15;
-pub const SYS_chown = 16;
-pub const SYS_break = 17;
-// 18 is freebsd4 getfsstat
-// 19 is old lseek
-pub const SYS_getpid = 20;
-pub const SYS_mount = 21;
-pub const SYS_unmount = 22;
-pub const SYS_setuid = 23;
-pub const SYS_getuid = 24;
-pub const SYS_geteuid = 25;
-pub const SYS_ptrace = 26;
-pub const SYS_recvmsg = 27;
-pub const SYS_sendmsg = 28;
-pub const SYS_recvfrom = 29;
-pub const SYS_accept = 30;
-pub const SYS_getpeername = 31;
-pub const SYS_getsockname = 32;
-pub const SYS_access = 33;
-pub const SYS_chflags = 34;
-pub const SYS_fchflags = 35;
-pub const SYS_sync = 36;
-pub const SYS_kill = 37;
-// 38 is old stat
-pub const SYS_getppid = 39;
-// 40 is old lstat
-pub const SYS_dup = 41;
-pub const SYS_freebsd10_pipe = 42;
-pub const SYS_getegid = 43;
-pub const SYS_profil = 44;
-pub const SYS_ktrace = 45;
-// 46 is old sigaction
-pub const SYS_getgid = 47;
-// 48 is old sigprocmask
-pub const SYS_getlogin = 49;
-pub const SYS_setlogin = 50;
-pub const SYS_acct = 51;
-// 52 is old sigpending
-pub const SYS_sigaltstack = 53;
-pub const SYS_ioctl = 54;
-pub const SYS_reboot = 55;
-pub const SYS_revoke = 56;
-pub const SYS_symlink = 57;
-pub const SYS_readlink = 58;
-pub const SYS_execve = 59;
-pub const SYS_umask = 60;
-pub const SYS_chroot = 61;
-// 62 is old fstat
-// 63 is old getkerninfo
-// 64 is old getpagesize
-pub const SYS_msync = 65;
-pub const SYS_vfork = 66;
-// 67 is obsolete vread
-// 68 is obsolete vwrite
-pub const SYS_sbrk = 69;
-pub const SYS_sstk = 70;
-// 71 is old mmap
-pub const SYS_vadvise = 72;
-pub const SYS_munmap = 73;
-pub const SYS_mprotect = 74;
-pub const SYS_madvise = 75;
-// 76 is obsolete vhangup
-// 77 is obsolete vlimit
-pub const SYS_mincore = 78;
-pub const SYS_getgroups = 79;
-pub const SYS_setgroups = 80;
-pub const SYS_getpgrp = 81;
-pub const SYS_setpgid = 82;
-pub const SYS_setitimer = 83;
-// 84 is old wait
-pub const SYS_swapon = 85;
-pub const SYS_getitimer = 86;
-// 87 is old gethostname
-// 88 is old sethostname
-pub const SYS_getdtablesize = 89;
-pub const SYS_dup2 = 90;
-pub const SYS_fcntl = 92;
-pub const SYS_select = 93;
-pub const SYS_fsync = 95;
-pub const SYS_setpriority = 96;
-pub const SYS_socket = 97;
-pub const SYS_connect = 98;
-// 99 is old accept
-pub const SYS_getpriority = 100;
-// 101 is old send
-// 102 is old recv
-// 103 is old sigreturn
-pub const SYS_bind = 104;
-pub const SYS_setsockopt = 105;
-pub const SYS_listen = 106;
-// 107 is obsolete vtimes
-// 108 is old sigvec
-// 109 is old sigblock
-// 110 is old sigsetmask
-// 111 is old sigsuspend
-// 112 is old sigstack
-// 113 is old recvmsg
-// 114 is old sendmsg
-// 115 is obsolete vtrace
-pub const SYS_gettimeofday = 116;
-pub const SYS_getrusage = 117;
-pub const SYS_getsockopt = 118;
-pub const SYS_readv = 120;
-pub const SYS_writev = 121;
-pub const SYS_settimeofday = 122;
-pub const SYS_fchown = 123;
-pub const SYS_fchmod = 124;
-// 125 is old recvfrom
-pub const SYS_setreuid = 126;
-pub const SYS_setregid = 127;
-pub const SYS_rename = 128;
-// 129 is old truncate
-// 130 is old ftruncate
-pub const SYS_flock = 131;
-pub const SYS_mkfifo = 132;
-pub const SYS_sendto = 133;
-pub const SYS_shutdown = 134;
-pub const SYS_socketpair = 135;
-pub const SYS_mkdir = 136;
-pub const SYS_rmdir = 137;
-pub const SYS_utimes = 138;
-// 139 is obsolete 4.2 sigreturn
-pub const SYS_adjtime = 140;
-// 141 is old getpeername
-// 142 is old gethostid
-// 143 is old sethostid
-// 144 is old getrlimit
-// 145 is old setrlimit
-// 146 is old killpg
-pub const SYS_setsid = 147;
-pub const SYS_quotactl = 148;
-// 149 is old quota
-// 150 is old getsockname
-pub const SYS_nlm_syscall = 154;
-pub const SYS_nfssvc = 155;
-// 156 is old getdirentries
-// 157 is freebsd4 statfs
-// 158 is freebsd4 fstatfs
-pub const SYS_lgetfh = 160;
-pub const SYS_getfh = 161;
-// 162 is freebsd4 getdomainname
-// 163 is freebsd4 setdomainname
-// 164 is freebsd4 uname
-pub const SYS_sysarch = 165;
-pub const SYS_rtprio = 166;
-pub const SYS_semsys = 169;
-pub const SYS_msgsys = 170;
-pub const SYS_shmsys = 171;
-// 173 is freebsd6 pread
-// 174 is freebsd6 pwrite
-pub const SYS_setfib = 175;
-pub const SYS_ntp_adjtime = 176;
-pub const SYS_setgid = 181;
-pub const SYS_setegid = 182;
-pub const SYS_seteuid = 183;
-pub const SYS_freebsd11_stat = 188;
-pub const SYS_freebsd11_fstat = 189;
-pub const SYS_freebsd11_lstat = 190;
-pub const SYS_pathconf = 191;
-pub const SYS_fpathconf = 192;
-pub const SYS_getrlimit = 194;
-pub const SYS_setrlimit = 195;
-pub const SYS_freebsd11_getdirentries = 196;
-// 197 is freebsd6 mmap
-pub const SYS___syscall = 198;
-// 199 is freebsd6 lseek
-// 200 is freebsd6 truncate
-// 201 is freebsd6 ftruncate
-pub const SYS___sysctl = 202;
-pub const SYS_mlock = 203;
-pub const SYS_munlock = 204;
-pub const SYS_undelete = 205;
-pub const SYS_futimes = 206;
-pub const SYS_getpgid = 207;
-pub const SYS_poll = 209;
-pub const SYS_freebsd7___semctl = 220;
-pub const SYS_semget = 221;
-pub const SYS_semop = 222;
-pub const SYS_freebsd7_msgctl = 224;
-pub const SYS_msgget = 225;
-pub const SYS_msgsnd = 226;
-pub const SYS_msgrcv = 227;
-pub const SYS_shmat = 228;
-pub const SYS_freebsd7_shmctl = 229;
-pub const SYS_shmdt = 230;
-pub const SYS_shmget = 231;
-pub const SYS_clock_gettime = 232;
-pub const SYS_clock_settime = 233;
-pub const SYS_clock_getres = 234;
-pub const SYS_ktimer_create = 235;
-pub const SYS_ktimer_delete = 236;
-pub const SYS_ktimer_settime = 237;
-pub const SYS_ktimer_gettime = 238;
-pub const SYS_ktimer_getoverrun = 239;
-pub const SYS_nanosleep = 240;
-pub const SYS_ffclock_getcounter = 241;
-pub const SYS_ffclock_setestimate = 242;
-pub const SYS_ffclock_getestimate = 243;
-pub const SYS_clock_nanosleep = 244;
-pub const SYS_clock_getcpuclockid2 = 247;
-pub const SYS_ntp_gettime = 248;
-pub const SYS_minherit = 250;
-pub const SYS_rfork = 251;
-// 252 is obsolete openbsd_poll
-pub const SYS_issetugid = 253;
-pub const SYS_lchown = 254;
-pub const SYS_aio_read = 255;
-pub const SYS_aio_write = 256;
-pub const SYS_lio_listio = 257;
-pub const SYS_freebsd11_getdents = 272;
-pub const SYS_lchmod = 274;
-pub const SYS_netbsd_lchown = 275;
-pub const SYS_lutimes = 276;
-pub const SYS_netbsd_msync = 277;
-pub const SYS_freebsd11_nstat = 278;
-pub const SYS_freebsd11_nfstat = 279;
-pub const SYS_freebsd11_nlstat = 280;
-pub const SYS_preadv = 289;
-pub const SYS_pwritev = 290;
-// 297 is freebsd4 fhstatfs
-pub const SYS_fhopen = 298;
-pub const SYS_freebsd11_fhstat = 299;
-pub const SYS_modnext = 300;
-pub const SYS_modstat = 301;
-pub const SYS_modfnext = 302;
-pub const SYS_modfind = 303;
-pub const SYS_kldload = 304;
-pub const SYS_kldunload = 305;
-pub const SYS_kldfind = 306;
-pub const SYS_kldnext = 307;
-pub const SYS_kldstat = 308;
-pub const SYS_kldfirstmod = 309;
-pub const SYS_getsid = 310;
-pub const SYS_setresuid = 311;
-pub const SYS_setresgid = 312;
-// 313 is obsolete signanosleep
-pub const SYS_aio_return = 314;
-pub const SYS_aio_suspend = 315;
-pub const SYS_aio_cancel = 316;
-pub const SYS_aio_error = 317;
-// 318 is freebsd6 aio_read
-// 319 is freebsd6 aio_write
-// 320 is freebsd6 lio_listio
-pub const SYS_yield = 321;
-// 322 is obsolete thr_sleep
-// 323 is obsolete thr_wakeup
-pub const SYS_mlockall = 324;
-pub const SYS_munlockall = 325;
-pub const SYS___getcwd = 326;
-pub const SYS_sched_setparam = 327;
-pub const SYS_sched_getparam = 328;
-pub const SYS_sched_setscheduler = 329;
-pub const SYS_sched_getscheduler = 330;
-pub const SYS_sched_yield = 331;
-pub const SYS_sched_get_priority_max = 332;
-pub const SYS_sched_get_priority_min = 333;
-pub const SYS_sched_rr_get_interval = 334;
-pub const SYS_utrace = 335;
-// 336 is freebsd4 sendfile
-pub const SYS_kldsym = 337;
-pub const SYS_jail = 338;
-pub const SYS_nnpfs_syscall = 339;
-pub const SYS_sigprocmask = 340;
-pub const SYS_sigsuspend = 341;
-// 342 is freebsd4 sigaction
-pub const SYS_sigpending = 343;
-// 344 is freebsd4 sigreturn
-pub const SYS_sigtimedwait = 345;
-pub const SYS_sigwaitinfo = 346;
-pub const SYS___acl_get_file = 347;
-pub const SYS___acl_set_file = 348;
-pub const SYS___acl_get_fd = 349;
-pub const SYS___acl_set_fd = 350;
-pub const SYS___acl_delete_file = 351;
-pub const SYS___acl_delete_fd = 352;
-pub const SYS___acl_aclcheck_file = 353;
-pub const SYS___acl_aclcheck_fd = 354;
-pub const SYS_extattrctl = 355;
-pub const SYS_extattr_set_file = 356;
-pub const SYS_extattr_get_file = 357;
-pub const SYS_extattr_delete_file = 358;
-pub const SYS_aio_waitcomplete = 359;
-pub const SYS_getresuid = 360;
-pub const SYS_getresgid = 361;
-pub const SYS_kqueue = 362;
-pub const SYS_freebsd11_kevent = 363;
-pub const SYS_extattr_set_fd = 371;
-pub const SYS_extattr_get_fd = 372;
-pub const SYS_extattr_delete_fd = 373;
-pub const SYS___setugid = 374;
-pub const SYS_eaccess = 376;
-pub const SYS_afs3_syscall = 377;
-pub const SYS_nmount = 378;
-pub const SYS___mac_get_proc = 384;
-pub const SYS___mac_set_proc = 385;
-pub const SYS___mac_get_fd = 386;
-pub const SYS___mac_get_file = 387;
-pub const SYS___mac_set_fd = 388;
-pub const SYS___mac_set_file = 389;
-pub const SYS_kenv = 390;
-pub const SYS_lchflags = 391;
-pub const SYS_uuidgen = 392;
-pub const SYS_sendfile = 393;
-pub const SYS_mac_syscall = 394;
-pub const SYS_freebsd11_getfsstat = 395;
-pub const SYS_freebsd11_statfs = 396;
-pub const SYS_freebsd11_fstatfs = 397;
-pub const SYS_freebsd11_fhstatfs = 398;
-pub const SYS_ksem_close = 400;
-pub const SYS_ksem_post = 401;
-pub const SYS_ksem_wait = 402;
-pub const SYS_ksem_trywait = 403;
-pub const SYS_ksem_init = 404;
-pub const SYS_ksem_open = 405;
-pub const SYS_ksem_unlink = 406;
-pub const SYS_ksem_getvalue = 407;
-pub const SYS_ksem_destroy = 408;
-pub const SYS___mac_get_pid = 409;
-pub const SYS___mac_get_link = 410;
-pub const SYS___mac_set_link = 411;
-pub const SYS_extattr_set_link = 412;
-pub const SYS_extattr_get_link = 413;
-pub const SYS_extattr_delete_link = 414;
-pub const SYS___mac_execve = 415;
-pub const SYS_sigaction = 416;
-pub const SYS_sigreturn = 417;
-pub const SYS_getcontext = 421;
-pub const SYS_setcontext = 422;
-pub const SYS_swapcontext = 423;
-pub const SYS_swapoff = 424;
-pub const SYS___acl_get_link = 425;
-pub const SYS___acl_set_link = 426;
-pub const SYS___acl_delete_link = 427;
-pub const SYS___acl_aclcheck_link = 428;
-pub const SYS_sigwait = 429;
-pub const SYS_thr_create = 430;
-pub const SYS_thr_exit = 431;
-pub const SYS_thr_self = 432;
-pub const SYS_thr_kill = 433;
-pub const SYS_jail_attach = 436;
-pub const SYS_extattr_list_fd = 437;
-pub const SYS_extattr_list_file = 438;
-pub const SYS_extattr_list_link = 439;
-pub const SYS_ksem_timedwait = 441;
-pub const SYS_thr_suspend = 442;
-pub const SYS_thr_wake = 443;
-pub const SYS_kldunloadf = 444;
-pub const SYS_audit = 445;
-pub const SYS_auditon = 446;
-pub const SYS_getauid = 447;
-pub const SYS_setauid = 448;
-pub const SYS_getaudit = 449;
-pub const SYS_setaudit = 450;
-pub const SYS_getaudit_addr = 451;
-pub const SYS_setaudit_addr = 452;
-pub const SYS_auditctl = 453;
-pub const SYS__umtx_op = 454;
-pub const SYS_thr_new = 455;
-pub const SYS_sigqueue = 456;
-pub const SYS_kmq_open = 457;
-pub const SYS_kmq_setattr = 458;
-pub const SYS_kmq_timedreceive = 459;
-pub const SYS_kmq_timedsend = 460;
-pub const SYS_kmq_notify = 461;
-pub const SYS_kmq_unlink = 462;
-pub const SYS_abort2 = 463;
-pub const SYS_thr_set_name = 464;
-pub const SYS_aio_fsync = 465;
-pub const SYS_rtprio_thread = 466;
-pub const SYS_sctp_peeloff = 471;
-pub const SYS_sctp_generic_sendmsg = 472;
-pub const SYS_sctp_generic_sendmsg_iov = 473;
-pub const SYS_sctp_generic_recvmsg = 474;
-pub const SYS_pread = 475;
-pub const SYS_pwrite = 476;
-pub const SYS_mmap = 477;
-pub const SYS_lseek = 478;
-pub const SYS_truncate = 479;
-pub const SYS_ftruncate = 480;
-pub const SYS_thr_kill2 = 481;
-pub const SYS_shm_open = 482;
-pub const SYS_shm_unlink = 483;
-pub const SYS_cpuset = 484;
-pub const SYS_cpuset_setid = 485;
-pub const SYS_cpuset_getid = 486;
-pub const SYS_cpuset_getaffinity = 487;
-pub const SYS_cpuset_setaffinity = 488;
-pub const SYS_faccessat = 489;
-pub const SYS_fchmodat = 490;
-pub const SYS_fchownat = 491;
-pub const SYS_fexecve = 492;
-pub const SYS_freebsd11_fstatat = 493;
-pub const SYS_futimesat = 494;
-pub const SYS_linkat = 495;
-pub const SYS_mkdirat = 496;
-pub const SYS_mkfifoat = 497;
-pub const SYS_freebsd11_mknodat = 498;
-pub const SYS_openat = 499;
-pub const SYS_readlinkat = 500;
-pub const SYS_renameat = 501;
-pub const SYS_symlinkat = 502;
-pub const SYS_unlinkat = 503;
-pub const SYS_posix_openpt = 504;
-pub const SYS_gssd_syscall = 505;
-pub const SYS_jail_get = 506;
-pub const SYS_jail_set = 507;
-pub const SYS_jail_remove = 508;
-pub const SYS_closefrom = 509;
-pub const SYS___semctl = 510;
-pub const SYS_msgctl = 511;
-pub const SYS_shmctl = 512;
-pub const SYS_lpathconf = 513;
-// 514 is obsolete cap_new
-pub const SYS___cap_rights_get = 515;
-pub const SYS_cap_enter = 516;
-pub const SYS_cap_getmode = 517;
-pub const SYS_pdfork = 518;
-pub const SYS_pdkill = 519;
-pub const SYS_pdgetpid = 520;
-pub const SYS_pselect = 522;
-pub const SYS_getloginclass = 523;
-pub const SYS_setloginclass = 524;
-pub const SYS_rctl_get_racct = 525;
-pub const SYS_rctl_get_rules = 526;
-pub const SYS_rctl_get_limits = 527;
-pub const SYS_rctl_add_rule = 528;
-pub const SYS_rctl_remove_rule = 529;
-pub const SYS_posix_fallocate = 530;
-pub const SYS_posix_fadvise = 531;
-pub const SYS_wait6 = 532;
-pub const SYS_cap_rights_limit = 533;
-pub const SYS_cap_ioctls_limit = 534;
-pub const SYS_cap_ioctls_get = 535;
-pub const SYS_cap_fcntls_limit = 536;
-pub const SYS_cap_fcntls_get = 537;
-pub const SYS_bindat = 538;
-pub const SYS_connectat = 539;
-pub const SYS_chflagsat = 540;
-pub const SYS_accept4 = 541;
-pub const SYS_pipe2 = 542;
-pub const SYS_aio_mlock = 543;
-pub const SYS_procctl = 544;
-pub const SYS_ppoll = 545;
-pub const SYS_futimens = 546;
-pub const SYS_utimensat = 547;
-pub const SYS_numa_getaffinity = 548;
-pub const SYS_numa_setaffinity = 549;
-pub const SYS_fdatasync = 550;
-pub const SYS_fstat = 551;
-pub const SYS_fstatat = 552;
-pub const SYS_fhstat = 553;
-pub const SYS_getdirentries = 554;
-pub const SYS_statfs = 555;
-pub const SYS_fstatfs = 556;
-pub const SYS_getfsstat = 557;
-pub const SYS_fhstatfs = 558;
-pub const SYS_mknodat = 559;
-pub const SYS_kevent = 560;
-pub const SYS_MAXSYSCALL = 561;
-
-// From here
-pub const O_CREAT        = 0o100;
-pub const O_EXCL         = 0o200;
-pub const O_NOCTTY       = 0o400;
-pub const O_TRUNC       = 0o1000;
-pub const O_APPEND      = 0o2000;
-pub const O_NONBLOCK    = 0o4000;
-pub const O_DSYNC      = 0o10000;
-pub const O_SYNC     = 0o4010000;
-pub const O_RSYNC    = 0o4010000;
-pub const O_DIRECTORY = 0o200000;
-pub const O_NOFOLLOW  = 0o400000;
-pub const O_CLOEXEC  = 0o2000000;
-
-pub const O_ASYNC      = 0o20000;
-pub const O_DIRECT     = 0o40000;
-pub const O_LARGEFILE = 0o100000;
-pub const O_NOATIME  = 0o1000000;
-pub const O_PATH    = 0o10000000;
-pub const O_TMPFILE = 0o20200000;
-pub const O_NDELAY =  O_NONBLOCK;
-
-pub const F_DUPFD  = 0;
-pub const F_GETFD  = 1;
-pub const F_SETFD  = 2;
-pub const F_GETFL  = 3;
-pub const F_SETFL  = 4;
-
-pub const F_SETOWN = 8;
-pub const F_GETOWN = 9;
-pub const F_SETSIG = 10;
-pub const F_GETSIG = 11;
-
-pub const F_GETLK = 12;
-pub const F_SETLK = 13;
-pub const F_SETLKW = 14;
-
-pub const F_SETOWN_EX = 15;
-pub const F_GETOWN_EX = 16;
-
-pub const F_GETOWNER_UIDS = 17;
-
-pub inline fn syscall0(number: usize) -> usize {
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number))
-}
-
-pub inline fn syscall1(number: usize, arg1: usize) -> usize {
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1))
-}
-
-pub inline fn syscall2(number: usize, arg1: usize, arg2: usize) -> usize {
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1),
-            [arg2] "{ecx}" (arg2))
-}
-
-pub inline fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1),
-            [arg2] "{ecx}" (arg2),
-            [arg3] "{edx}" (arg3))
-}
-
-pub inline fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) -> usize {
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1),
-            [arg2] "{ecx}" (arg2),
-            [arg3] "{edx}" (arg3),
-            [arg4] "{esi}" (arg4))
-}
-
-pub inline fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize,
-    arg4: usize, arg5: usize) -> usize
-{
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1),
-            [arg2] "{ecx}" (arg2),
-            [arg3] "{edx}" (arg3),
-            [arg4] "{esi}" (arg4),
-            [arg5] "{edi}" (arg5))
-}
-
-pub inline fn syscall6(number: usize, arg1: usize, arg2: usize, arg3: usize,
-    arg4: usize, arg5: usize, arg6: usize) -> usize
-{
-    asm volatile ("int $0x80"
-        : [ret] "={eax}" (-> usize)
-        : [number] "{eax}" (number),
-            [arg1] "{ebx}" (arg1),
-            [arg2] "{ecx}" (arg2),
-            [arg3] "{edx}" (arg3),
-            [arg4] "{esi}" (arg4),
-            [arg5] "{edi}" (arg5),
-            [arg6] "{ebp}" (arg6))
-}
-
-pub nakedcc fn restore() {
-    asm volatile (
-        \\popl %%eax
-        \\movl $119, %%eax
-        \\int $0x80
-        :
-        :
-        : "rcx", "r11")
-}
-
-pub nakedcc fn restore_rt() {
-    asm volatile ("int $0x80"
-        :
-        : [number] "{eax}" (usize(SYS_rt_sigreturn))
-        : "rcx", "r11")
-}
-
-export struct msghdr {
-    msg_name: &u8,
-    msg_namelen: socklen_t,
-    msg_iov: &iovec,
-    msg_iovlen: i32,
-    msg_control: &u8,
-    msg_controllen: socklen_t,
-    msg_flags: i32,
-}
diff --git a/std/os/freebsd_x86_64.zig b/std/os/freebsd_x86_64.zig
deleted file mode 100644
index 09b4680329449d712279c22ac787a740c2035c2f..0000000000000000000000000000000000000000
--- a/std/os/freebsd_x86_64.zig
+++ /dev/null
@@ -1,650 +0,0 @@
-const freebsd = @import("index.zig");
-const socklen_t = freebsd.socklen_t;
-const iovec = freebsd.iovec;
-
-pub const SYS_syscall = 0;
-pub const SYS_exit = 1;
-pub const SYS_fork = 2;
-pub const SYS_read = 3;
-pub const SYS_write = 4;
-pub const SYS_open = 5;
-pub const SYS_close = 6;
-pub const SYS_wait4 = 7;
-// 8 is old creat
-pub const SYS_link = 9;
-pub const SYS_unlink = 10;
-// 11 is obsolete execv
-pub const SYS_chdir = 12;
-pub const SYS_fchdir = 13;
-pub const SYS_freebsd11_mknod = 14;
-pub const SYS_chmod = 15;
-pub const SYS_chown = 16;
-pub const SYS_break = 17;
-// 18 is freebsd4 getfsstat
-// 19 is old lseek
-pub const SYS_getpid = 20;
-pub const SYS_mount = 21;
-pub const SYS_unmount = 22;
-pub const SYS_setuid = 23;
-pub const SYS_getuid = 24;
-pub const SYS_geteuid = 25;
-pub const SYS_ptrace = 26;
-pub const SYS_recvmsg = 27;
-pub const SYS_sendmsg = 28;
-pub const SYS_recvfrom = 29;
-pub const SYS_accept = 30;
-pub const SYS_getpeername = 31;
-pub const SYS_getsockname = 32;
-pub const SYS_access = 33;
-pub const SYS_chflags = 34;
-pub const SYS_fchflags = 35;
-pub const SYS_sync = 36;
-pub const SYS_kill = 37;
-// 38 is old stat
-pub const SYS_getppid = 39;
-// 40 is old lstat
-pub const SYS_dup = 41;
-pub const SYS_freebsd10_pipe = 42;
-pub const SYS_getegid = 43;
-pub const SYS_profil = 44;
-pub const SYS_ktrace = 45;
-// 46 is old sigaction
-pub const SYS_getgid = 47;
-// 48 is old sigprocmask
-pub const SYS_getlogin = 49;
-pub const SYS_setlogin = 50;
-pub const SYS_acct = 51;
-// 52 is old sigpending
-pub const SYS_sigaltstack = 53;
-pub const SYS_ioctl = 54;
-pub const SYS_reboot = 55;
-pub const SYS_revoke = 56;
-pub const SYS_symlink = 57;
-pub const SYS_readlink = 58;
-pub const SYS_execve = 59;
-pub const SYS_umask = 60;
-pub const SYS_chroot = 61;
-// 62 is old fstat
-// 63 is old getkerninfo
-// 64 is old getpagesize
-pub const SYS_msync = 65;
-pub const SYS_vfork = 66;
-// 67 is obsolete vread
-// 68 is obsolete vwrite
-pub const SYS_sbrk = 69;
-pub const SYS_sstk = 70;
-// 71 is old mmap
-pub const SYS_vadvise = 72;
-pub const SYS_munmap = 73;
-pub const SYS_mprotect = 74;
-pub const SYS_madvise = 75;
-// 76 is obsolete vhangup
-// 77 is obsolete vlimit
-pub const SYS_mincore = 78;
-pub const SYS_getgroups = 79;
-pub const SYS_setgroups = 80;
-pub const SYS_getpgrp = 81;
-pub const SYS_setpgid = 82;
-pub const SYS_setitimer = 83;
-// 84 is old wait
-pub const SYS_swapon = 85;
-pub const SYS_getitimer = 86;
-// 87 is old gethostname
-// 88 is old sethostname
-pub const SYS_getdtablesize = 89;
-pub const SYS_dup2 = 90;
-pub const SYS_fcntl = 92;
-pub const SYS_select = 93;
-pub const SYS_fsync = 95;
-pub const SYS_setpriority = 96;
-pub const SYS_socket = 97;
-pub const SYS_connect = 98;
-// 99 is old accept
-pub const SYS_getpriority = 100;
-// 101 is old send
-// 102 is old recv
-// 103 is old sigreturn
-pub const SYS_bind = 104;
-pub const SYS_setsockopt = 105;
-pub const SYS_listen = 106;
-// 107 is obsolete vtimes
-// 108 is old sigvec
-// 109 is old sigblock
-// 110 is old sigsetmask
-// 111 is old sigsuspend
-// 112 is old sigstack
-// 113 is old recvmsg
-// 114 is old sendmsg
-// 115 is obsolete vtrace
-pub const SYS_gettimeofday = 116;
-pub const SYS_getrusage = 117;
-pub const SYS_getsockopt = 118;
-pub const SYS_readv = 120;
-pub const SYS_writev = 121;
-pub const SYS_settimeofday = 122;
-pub const SYS_fchown = 123;
-pub const SYS_fchmod = 124;
-// 125 is old recvfrom
-pub const SYS_setreuid = 126;
-pub const SYS_setregid = 127;
-pub const SYS_rename = 128;
-// 129 is old truncate
-// 130 is old ftruncate
-pub const SYS_flock = 131;
-pub const SYS_mkfifo = 132;
-pub const SYS_sendto = 133;
-pub const SYS_shutdown = 134;
-pub const SYS_socketpair = 135;
-pub const SYS_mkdir = 136;
-pub const SYS_rmdir = 137;
-pub const SYS_utimes = 138;
-// 139 is obsolete 4.2 sigreturn
-pub const SYS_adjtime = 140;
-// 141 is old getpeername
-// 142 is old gethostid
-// 143 is old sethostid
-// 144 is old getrlimit
-// 145 is old setrlimit
-// 146 is old killpg
-pub const SYS_setsid = 147;
-pub const SYS_quotactl = 148;
-// 149 is old quota
-// 150 is old getsockname
-pub const SYS_nlm_syscall = 154;
-pub const SYS_nfssvc = 155;
-// 156 is old getdirentries
-// 157 is freebsd4 statfs
-// 158 is freebsd4 fstatfs
-pub const SYS_lgetfh = 160;
-pub const SYS_getfh = 161;
-// 162 is freebsd4 getdomainname
-// 163 is freebsd4 setdomainname
-// 164 is freebsd4 uname
-pub const SYS_sysarch = 165;
-pub const SYS_rtprio = 166;
-pub const SYS_semsys = 169;
-pub const SYS_msgsys = 170;
-pub const SYS_shmsys = 171;
-// 173 is freebsd6 pread
-// 174 is freebsd6 pwrite
-pub const SYS_setfib = 175;
-pub const SYS_ntp_adjtime = 176;
-pub const SYS_setgid = 181;
-pub const SYS_setegid = 182;
-pub const SYS_seteuid = 183;
-pub const SYS_freebsd11_stat = 188;
-pub const SYS_freebsd11_fstat = 189;
-pub const SYS_freebsd11_lstat = 190;
-pub const SYS_pathconf = 191;
-pub const SYS_fpathconf = 192;
-pub const SYS_getrlimit = 194;
-pub const SYS_setrlimit = 195;
-pub const SYS_freebsd11_getdirentries = 196;
-// 197 is freebsd6 mmap
-pub const SYS___syscall = 198;
-// 199 is freebsd6 lseek
-// 200 is freebsd6 truncate
-// 201 is freebsd6 ftruncate
-pub const SYS___sysctl = 202;
-pub const SYS_mlock = 203;
-pub const SYS_munlock = 204;
-pub const SYS_undelete = 205;
-pub const SYS_futimes = 206;
-pub const SYS_getpgid = 207;
-pub const SYS_poll = 209;
-pub const SYS_freebsd7___semctl = 220;
-pub const SYS_semget = 221;
-pub const SYS_semop = 222;
-pub const SYS_freebsd7_msgctl = 224;
-pub const SYS_msgget = 225;
-pub const SYS_msgsnd = 226;
-pub const SYS_msgrcv = 227;
-pub const SYS_shmat = 228;
-pub const SYS_freebsd7_shmctl = 229;
-pub const SYS_shmdt = 230;
-pub const SYS_shmget = 231;
-pub const SYS_clock_gettime = 232;
-pub const SYS_clock_settime = 233;
-pub const SYS_clock_getres = 234;
-pub const SYS_ktimer_create = 235;
-pub const SYS_ktimer_delete = 236;
-pub const SYS_ktimer_settime = 237;
-pub const SYS_ktimer_gettime = 238;
-pub const SYS_ktimer_getoverrun = 239;
-pub const SYS_nanosleep = 240;
-pub const SYS_ffclock_getcounter = 241;
-pub const SYS_ffclock_setestimate = 242;
-pub const SYS_ffclock_getestimate = 243;
-pub const SYS_clock_nanosleep = 244;
-pub const SYS_clock_getcpuclockid2 = 247;
-pub const SYS_ntp_gettime = 248;
-pub const SYS_minherit = 250;
-pub const SYS_rfork = 251;
-// 252 is obsolete openbsd_poll
-pub const SYS_issetugid = 253;
-pub const SYS_lchown = 254;
-pub const SYS_aio_read = 255;
-pub const SYS_aio_write = 256;
-pub const SYS_lio_listio = 257;
-pub const SYS_freebsd11_getdents = 272;
-pub const SYS_lchmod = 274;
-pub const SYS_netbsd_lchown = 275;
-pub const SYS_lutimes = 276;
-pub const SYS_netbsd_msync = 277;
-pub const SYS_freebsd11_nstat = 278;
-pub const SYS_freebsd11_nfstat = 279;
-pub const SYS_freebsd11_nlstat = 280;
-pub const SYS_preadv = 289;
-pub const SYS_pwritev = 290;
-// 297 is freebsd4 fhstatfs
-pub const SYS_fhopen = 298;
-pub const SYS_freebsd11_fhstat = 299;
-pub const SYS_modnext = 300;
-pub const SYS_modstat = 301;
-pub const SYS_modfnext = 302;
-pub const SYS_modfind = 303;
-pub const SYS_kldload = 304;
-pub const SYS_kldunload = 305;
-pub const SYS_kldfind = 306;
-pub const SYS_kldnext = 307;
-pub const SYS_kldstat = 308;
-pub const SYS_kldfirstmod = 309;
-pub const SYS_getsid = 310;
-pub const SYS_setresuid = 311;
-pub const SYS_setresgid = 312;
-// 313 is obsolete signanosleep
-pub const SYS_aio_return = 314;
-pub const SYS_aio_suspend = 315;
-pub const SYS_aio_cancel = 316;
-pub const SYS_aio_error = 317;
-// 318 is freebsd6 aio_read
-// 319 is freebsd6 aio_write
-// 320 is freebsd6 lio_listio
-pub const SYS_yield = 321;
-// 322 is obsolete thr_sleep
-// 323 is obsolete thr_wakeup
-pub const SYS_mlockall = 324;
-pub const SYS_munlockall = 325;
-pub const SYS___getcwd = 326;
-pub const SYS_sched_setparam = 327;
-pub const SYS_sched_getparam = 328;
-pub const SYS_sched_setscheduler = 329;
-pub const SYS_sched_getscheduler = 330;
-pub const SYS_sched_yield = 331;
-pub const SYS_sched_get_priority_max = 332;
-pub const SYS_sched_get_priority_min = 333;
-pub const SYS_sched_rr_get_interval = 334;
-pub const SYS_utrace = 335;
-// 336 is freebsd4 sendfile
-pub const SYS_kldsym = 337;
-pub const SYS_jail = 338;
-pub const SYS_nnpfs_syscall = 339;
-pub const SYS_sigprocmask = 340;
-pub const SYS_sigsuspend = 341;
-// 342 is freebsd4 sigaction
-pub const SYS_sigpending = 343;
-// 344 is freebsd4 sigreturn
-pub const SYS_sigtimedwait = 345;
-pub const SYS_sigwaitinfo = 346;
-pub const SYS___acl_get_file = 347;
-pub const SYS___acl_set_file = 348;
-pub const SYS___acl_get_fd = 349;
-pub const SYS___acl_set_fd = 350;
-pub const SYS___acl_delete_file = 351;
-pub const SYS___acl_delete_fd = 352;
-pub const SYS___acl_aclcheck_file = 353;
-pub const SYS___acl_aclcheck_fd = 354;
-pub const SYS_extattrctl = 355;
-pub const SYS_extattr_set_file = 356;
-pub const SYS_extattr_get_file = 357;
-pub const SYS_extattr_delete_file = 358;
-pub const SYS_aio_waitcomplete = 359;
-pub const SYS_getresuid = 360;
-pub const SYS_getresgid = 361;
-pub const SYS_kqueue = 362;
-pub const SYS_freebsd11_kevent = 363;
-pub const SYS_extattr_set_fd = 371;
-pub const SYS_extattr_get_fd = 372;
-pub const SYS_extattr_delete_fd = 373;
-pub const SYS___setugid = 374;
-pub const SYS_eaccess = 376;
-pub const SYS_afs3_syscall = 377;
-pub const SYS_nmount = 378;
-pub const SYS___mac_get_proc = 384;
-pub const SYS___mac_set_proc = 385;
-pub const SYS___mac_get_fd = 386;
-pub const SYS___mac_get_file = 387;
-pub const SYS___mac_set_fd = 388;
-pub const SYS___mac_set_file = 389;
-pub const SYS_kenv = 390;
-pub const SYS_lchflags = 391;
-pub const SYS_uuidgen = 392;
-pub const SYS_sendfile = 393;
-pub const SYS_mac_syscall = 394;
-pub const SYS_freebsd11_getfsstat = 395;
-pub const SYS_freebsd11_statfs = 396;
-pub const SYS_freebsd11_fstatfs = 397;
-pub const SYS_freebsd11_fhstatfs = 398;
-pub const SYS_ksem_close = 400;
-pub const SYS_ksem_post = 401;
-pub const SYS_ksem_wait = 402;
-pub const SYS_ksem_trywait = 403;
-pub const SYS_ksem_init = 404;
-pub const SYS_ksem_open = 405;
-pub const SYS_ksem_unlink = 406;
-pub const SYS_ksem_getvalue = 407;
-pub const SYS_ksem_destroy = 408;
-pub const SYS___mac_get_pid = 409;
-pub const SYS___mac_get_link = 410;
-pub const SYS___mac_set_link = 411;
-pub const SYS_extattr_set_link = 412;
-pub const SYS_extattr_get_link = 413;
-pub const SYS_extattr_delete_link = 414;
-pub const SYS___mac_execve = 415;
-pub const SYS_sigaction = 416;
-pub const SYS_sigreturn = 417;
-pub const SYS_getcontext = 421;
-pub const SYS_setcontext = 422;
-pub const SYS_swapcontext = 423;
-pub const SYS_swapoff = 424;
-pub const SYS___acl_get_link = 425;
-pub const SYS___acl_set_link = 426;
-pub const SYS___acl_delete_link = 427;
-pub const SYS___acl_aclcheck_link = 428;
-pub const SYS_sigwait = 429;
-pub const SYS_thr_create = 430;
-pub const SYS_thr_exit = 431;
-pub const SYS_thr_self = 432;
-pub const SYS_thr_kill = 433;
-pub const SYS_jail_attach = 436;
-pub const SYS_extattr_list_fd = 437;
-pub const SYS_extattr_list_file = 438;
-pub const SYS_extattr_list_link = 439;
-pub const SYS_ksem_timedwait = 441;
-pub const SYS_thr_suspend = 442;
-pub const SYS_thr_wake = 443;
-pub const SYS_kldunloadf = 444;
-pub const SYS_audit = 445;
-pub const SYS_auditon = 446;
-pub const SYS_getauid = 447;
-pub const SYS_setauid = 448;
-pub const SYS_getaudit = 449;
-pub const SYS_setaudit = 450;
-pub const SYS_getaudit_addr = 451;
-pub const SYS_setaudit_addr = 452;
-pub const SYS_auditctl = 453;
-pub const SYS__umtx_op = 454;
-pub const SYS_thr_new = 455;
-pub const SYS_sigqueue = 456;
-pub const SYS_kmq_open = 457;
-pub const SYS_kmq_setattr = 458;
-pub const SYS_kmq_timedreceive = 459;
-pub const SYS_kmq_timedsend = 460;
-pub const SYS_kmq_notify = 461;
-pub const SYS_kmq_unlink = 462;
-pub const SYS_abort2 = 463;
-pub const SYS_thr_set_name = 464;
-pub const SYS_aio_fsync = 465;
-pub const SYS_rtprio_thread = 466;
-pub const SYS_sctp_peeloff = 471;
-pub const SYS_sctp_generic_sendmsg = 472;
-pub const SYS_sctp_generic_sendmsg_iov = 473;
-pub const SYS_sctp_generic_recvmsg = 474;
-pub const SYS_pread = 475;
-pub const SYS_pwrite = 476;
-pub const SYS_mmap = 477;
-pub const SYS_lseek = 478;
-pub const SYS_truncate = 479;
-pub const SYS_ftruncate = 480;
-pub const SYS_thr_kill2 = 481;
-pub const SYS_shm_open = 482;
-pub const SYS_shm_unlink = 483;
-pub const SYS_cpuset = 484;
-pub const SYS_cpuset_setid = 485;
-pub const SYS_cpuset_getid = 486;
-pub const SYS_cpuset_getaffinity = 487;
-pub const SYS_cpuset_setaffinity = 488;
-pub const SYS_faccessat = 489;
-pub const SYS_fchmodat = 490;
-pub const SYS_fchownat = 491;
-pub const SYS_fexecve = 492;
-pub const SYS_freebsd11_fstatat = 493;
-pub const SYS_futimesat = 494;
-pub const SYS_linkat = 495;
-pub const SYS_mkdirat = 496;
-pub const SYS_mkfifoat = 497;
-pub const SYS_freebsd11_mknodat = 498;
-pub const SYS_openat = 499;
-pub const SYS_readlinkat = 500;
-pub const SYS_renameat = 501;
-pub const SYS_symlinkat = 502;
-pub const SYS_unlinkat = 503;
-pub const SYS_posix_openpt = 504;
-pub const SYS_gssd_syscall = 505;
-pub const SYS_jail_get = 506;
-pub const SYS_jail_set = 507;
-pub const SYS_jail_remove = 508;
-pub const SYS_closefrom = 509;
-pub const SYS___semctl = 510;
-pub const SYS_msgctl = 511;
-pub const SYS_shmctl = 512;
-pub const SYS_lpathconf = 513;
-// 514 is obsolete cap_new
-pub const SYS___cap_rights_get = 515;
-pub const SYS_cap_enter = 516;
-pub const SYS_cap_getmode = 517;
-pub const SYS_pdfork = 518;
-pub const SYS_pdkill = 519;
-pub const SYS_pdgetpid = 520;
-pub const SYS_pselect = 522;
-pub const SYS_getloginclass = 523;
-pub const SYS_setloginclass = 524;
-pub const SYS_rctl_get_racct = 525;
-pub const SYS_rctl_get_rules = 526;
-pub const SYS_rctl_get_limits = 527;
-pub const SYS_rctl_add_rule = 528;
-pub const SYS_rctl_remove_rule = 529;
-pub const SYS_posix_fallocate = 530;
-pub const SYS_posix_fadvise = 531;
-pub const SYS_wait6 = 532;
-pub const SYS_cap_rights_limit = 533;
-pub const SYS_cap_ioctls_limit = 534;
-pub const SYS_cap_ioctls_get = 535;
-pub const SYS_cap_fcntls_limit = 536;
-pub const SYS_cap_fcntls_get = 537;
-pub const SYS_bindat = 538;
-pub const SYS_connectat = 539;
-pub const SYS_chflagsat = 540;
-pub const SYS_accept4 = 541;
-pub const SYS_pipe2 = 542;
-pub const SYS_aio_mlock = 543;
-pub const SYS_procctl = 544;
-pub const SYS_ppoll = 545;
-pub const SYS_futimens = 546;
-pub const SYS_utimensat = 547;
-pub const SYS_numa_getaffinity = 548;
-pub const SYS_numa_setaffinity = 549;
-pub const SYS_fdatasync = 550;
-pub const SYS_fstat = 551;
-pub const SYS_fstatat = 552;
-pub const SYS_fhstat = 553;
-pub const SYS_getdirentries = 554;
-pub const SYS_statfs = 555;
-pub const SYS_fstatfs = 556;
-pub const SYS_getfsstat = 557;
-pub const SYS_fhstatfs = 558;
-pub const SYS_mknodat = 559;
-pub const SYS_kevent = 560;
-pub const SYS_MAXSYSCALL = 561;
-
-pub const O_CREAT = 0o100;
-pub const O_EXCL = 0o200;
-pub const O_NOCTTY = 0o400;
-pub const O_TRUNC = 0o1000;
-pub const O_APPEND = 0o2000;
-pub const O_NONBLOCK = 0o4000;
-pub const O_DSYNC = 0o10000;
-pub const O_SYNC = 0o4010000;
-pub const O_RSYNC = 0o4010000;
-pub const O_DIRECTORY = 0o200000;
-pub const O_NOFOLLOW = 0o400000;
-pub const O_CLOEXEC = 0o2000000;
-
-pub const O_ASYNC = 0o20000;
-pub const O_DIRECT = 0o40000;
-pub const O_LARGEFILE = 0;
-pub const O_NOATIME = 0o1000000;
-pub const O_PATH = 0o10000000;
-pub const O_TMPFILE = 0o20200000;
-pub const O_NDELAY = O_NONBLOCK;
-
-pub const F_DUPFD = 0;
-pub const F_GETFD = 1;
-pub const F_SETFD = 2;
-pub const F_GETFL = 3;
-pub const F_SETFL = 4;
-
-pub const F_SETOWN = 8;
-pub const F_GETOWN = 9;
-pub const F_SETSIG = 10;
-pub const F_GETSIG = 11;
-
-pub const F_GETLK = 5;
-pub const F_SETLK = 6;
-pub const F_SETLKW = 7;
-
-pub const F_SETOWN_EX = 15;
-pub const F_GETOWN_EX = 16;
-
-pub const F_GETOWNER_UIDS = 17;
-
-pub fn syscall0(number: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall1(number: usize, arg1: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1),
-          [arg2] "{rsi}" (arg2)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1),
-          [arg2] "{rsi}" (arg2),
-          [arg3] "{rdx}" (arg3)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1),
-          [arg2] "{rsi}" (arg2),
-          [arg3] "{rdx}" (arg3),
-          [arg4] "{r10}" (arg4)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1),
-          [arg2] "{rsi}" (arg2),
-          [arg3] "{rdx}" (arg3),
-          [arg4] "{r10}" (arg4),
-          [arg5] "{r8}" (arg5)
-        : "rcx", "r11"
-    );
-}
-
-pub fn syscall6(
-    number: usize,
-    arg1: usize,
-    arg2: usize,
-    arg3: usize,
-    arg4: usize,
-    arg5: usize,
-    arg6: usize,
-) usize {
-    return asm volatile ("syscall"
-        : [ret] "={rax}" (-> usize)
-        : [number] "{rax}" (number),
-          [arg1] "{rdi}" (arg1),
-          [arg2] "{rsi}" (arg2),
-          [arg3] "{rdx}" (arg3),
-          [arg4] "{r10}" (arg4),
-          [arg5] "{r8}" (arg5),
-          [arg6] "{r9}" (arg6)
-        : "rcx", "r11"
-    );
-}
-
-pub nakedcc fn restore_rt() void {
-    asm volatile ("syscall"
-        :
-        : [number] "{rax}" (usize(SYS_rt_sigreturn))
-        : "rcx", "r11"
-    );
-}
-
-pub const msghdr = extern struct {
-    msg_name: &u8,
-    msg_namelen: socklen_t,
-    msg_iov: &iovec,
-    msg_iovlen: i32,
-    __pad1: i32,
-    msg_control: &u8,
-    msg_controllen: socklen_t,
-    __pad2: socklen_t,
-    msg_flags: i32,
-};
-
-/// Renamed to Stat to not conflict with the stat function.
-pub const Stat = extern struct {
-    dev: u64,
-    ino: u64,
-    nlink: usize,
-
-    mode: u32,
-    uid: u32,
-    gid: u32,
-    __pad0: u32,
-    rdev: u64,
-    size: i64,
-    blksize: isize,
-    blocks: i64,
-
-    atim: timespec,
-    mtim: timespec,
-    ctim: timespec,
-    __unused: [3]isize,
-};
-
-pub const timespec = extern struct {
-    tv_sec: isize,
-    tv_nsec: isize,
-};