Commit 79313d844f96f9f661cd2621a33890cefa8fb859 | zig

author	Brandon Black <bblack@wikimedia.org> 2025-09-08 13:33:00-05:00
committer	Brandon Black <bblack@wikimedia.org> 2025-09-08 14:45:51-05:00
log	79313d844f96f9f661cd2621a33890cefa8fb859
tree	b215bc2e0e3e5d8dfe3c5270186f3858a9d77079
parent	05cff8a558fda0e974ea7d00f26f8f4ff6e1195f

socketpair: posix wrapper, void on windows

socketpair is something like a pipe2() for sockets, and generally
only works for AF_UNIX sockets for most platforms.  Winsock2
explicitly does not support this call, even though it does have
AF_UNIX sockets.

2 files changed, 47 insertions(+), 1 deletions(-)

lib
- std
  - c.zig
  - posix.zig

lib/std/c.zig+7-1

lib/std/posix.zig+40

...	@@ -3671,6 +3671,46 @@ pub fn socket(domain: u32, socket_type: u32, protocol: u32) SocketError!socket_t	...	@@ -3671,6 +3671,46 @@ pub fn socket(domain: u32, socket_type: u32, protocol: u32) SocketError!socket_t
3671	}	3671	}
3672	}	3672	}
3673		3673
		3674	pub fn socketpair(domain: u32, socket_type: u32, protocol: u32) SocketError![2]socket_t {
		3675	// Note to the future: we could provide a shim here for e.g. windows which
		3676	// creates a listening socket, then creates a second socket and connects it
		3677	// to the listening socket, and then returns the two.
		3678	if (@TypeOf(system.socketpair) == void)
		3679	@compileError("socketpair() not supported by this OS");
		3680
		3681	// I'm not really sure if haiku supports flags here. I'm following the
		3682	// existing filter here from pipe2(), because it sure seems like it
		3683	// supports flags there too, but haiku can be hard to understand.
		3684	const have_sock_flags = !builtin.target.os.tag.isDarwin() and native_os != .haiku;
		3685	const filtered_sock_type = if (!have_sock_flags)
		3686	socket_type & ~@as(u32, SOCK.NONBLOCK \| SOCK.CLOEXEC)
		3687	else
		3688	socket_type;
		3689	var socks: [2]socket_t = undefined;
		3690	const rc = system.socketpair(domain, filtered_sock_type, protocol, &socks);
		3691	switch (errno(rc)) {
		3692	.SUCCESS => {
		3693	errdefer close(socks[0]);
		3694	errdefer close(socks[1]);
		3695	if (!have_sock_flags) {
		3696	try setSockFlags(socks[0], socket_type);
		3697	try setSockFlags(socks[1], socket_type);
		3698	}
		3699	return socks;
		3700	},
		3701	.ACCES => return error.AccessDenied,
		3702	.AFNOSUPPORT => return error.AddressFamilyNotSupported,
		3703	.INVAL => return error.ProtocolFamilyNotAvailable,
		3704	.MFILE => return error.ProcessFdQuotaExceeded,
		3705	.NFILE => return error.SystemFdQuotaExceeded,
		3706	.NOBUFS => return error.SystemResources,
		3707	.NOMEM => return error.SystemResources,
		3708	.PROTONOSUPPORT => return error.ProtocolNotSupported,
		3709	.PROTOTYPE => return error.SocketTypeNotSupported,
		3710	else => \|err\| return unexpectedErrno(err),
		3711	}
		3712	}
		3713
3674	pub const ShutdownError = error{	3714	pub const ShutdownError = error{
3675	ConnectionAborted,	3715	ConnectionAborted,
3676		3716

...	@@ -10599,6 +10599,12 @@ pub const socket = switch (native_os) {	...	@@ -10599,6 +10599,12 @@ pub const socket = switch (native_os) {
10599	else => private.socket,	10599	else => private.socket,
10600	};	10600	};
10601		10601
		10602	pub const socketpair = switch (native_os) {
		10603	// https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/#unsupported\unavailable:
		10604	.windows => void,
		10605	else => private.socketpair,
		10606	};
		10607
10602	pub const stat = switch (native_os) {	10608	pub const stat = switch (native_os) {
10603	.macos => switch (native_arch) {	10609	.macos => switch (native_arch) {
10604	.x86_64 => private.@"stat$INODE64",	10610	.x86_64 => private.@"stat$INODE64",
...	@@ -10740,7 +10746,6 @@ pub extern "c" fn uname(buf: *utsname) c_int;	...	@@ -10740,7 +10746,6 @@ pub extern "c" fn uname(buf: *utsname) c_int;
10740	pub extern "c" fn gethostname(name: [*]u8, len: usize) c_int;	10746	pub extern "c" fn gethostname(name: [*]u8, len: usize) c_int;
10741	pub extern "c" fn shutdown(socket: fd_t, how: c_int) c_int;	10747	pub extern "c" fn shutdown(socket: fd_t, how: c_int) c_int;
10742	pub extern "c" fn bind(socket: fd_t, address: ?*const sockaddr, address_len: socklen_t) c_int;	10748	pub extern "c" fn bind(socket: fd_t, address: ?*const sockaddr, address_len: socklen_t) c_int;
10743	pub extern "c" fn socketpair(domain: c_uint, sock_type: c_uint, protocol: c_uint, sv: *[2]fd_t) c_int;
10744	pub extern "c" fn listen(sockfd: fd_t, backlog: c_uint) c_int;	10749	pub extern "c" fn listen(sockfd: fd_t, backlog: c_uint) c_int;
10745	pub extern "c" fn getsockname(sockfd: fd_t, noalias addr: sockaddr, noalias addrlen: socklen_t) c_int;	10750	pub extern "c" fn getsockname(sockfd: fd_t, noalias addr: sockaddr, noalias addrlen: socklen_t) c_int;
10746	pub extern "c" fn getpeername(sockfd: fd_t, noalias addr: sockaddr, noalias addrlen: socklen_t) c_int;	10751	pub extern "c" fn getpeername(sockfd: fd_t, noalias addr: sockaddr, noalias addrlen: socklen_t) c_int;
...	@@ -11429,6 +11434,7 @@ const private = struct {	...	@@ -11429,6 +11434,7 @@ const private = struct {
11429	extern "c" fn sigismember(set: ?*const sigset_t, signo: c_int) c_int;	11434	extern "c" fn sigismember(set: ?*const sigset_t, signo: c_int) c_int;
11430	extern "c" fn sigprocmask(how: c_int, noalias set: ?const sigset_t, noalias oset: ?sigset_t) c_int;	11435	extern "c" fn sigprocmask(how: c_int, noalias set: ?const sigset_t, noalias oset: ?sigset_t) c_int;
11431	extern "c" fn socket(domain: c_uint, sock_type: c_uint, protocol: c_uint) c_int;	11436	extern "c" fn socket(domain: c_uint, sock_type: c_uint, protocol: c_uint) c_int;
		11437	extern "c" fn socketpair(domain: c_uint, sock_type: c_uint, protocol: c_uint, sv: *[2]fd_t) c_int;
11432	extern "c" fn stat(noalias path: [:0]const u8, noalias buf: Stat) c_int;	11438	extern "c" fn stat(noalias path: [:0]const u8, noalias buf: Stat) c_int;
11433	extern "c" fn sigaltstack(ss: ?stack_t, old_ss: ?stack_t) c_int;	11439	extern "c" fn sigaltstack(ss: ?stack_t, old_ss: ?stack_t) c_int;
11434	extern "c" fn sysconf(sc: c_int) c_long;	11440	extern "c" fn sysconf(sc: c_int) c_long;