| 1 | #include <unistd.h> |
| 2 | #include <sys/mman.h> |
| 3 | #include <errno.h> |
| 4 | #include <stdint.h> |
| 5 | #include <limits.h> |
| 6 | #include "syscall.h" |
| 7 | |
| 8 | static void dummy(void) { } |
| 9 | weak_alias(dummy, __vm_wait); |
| 10 | |
| 11 | #define UNIT SYSCALL_MMAP2_UNIT |
| 12 | #define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1)) |
| 13 | |
| 14 | void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off) |
| 15 | { |
| 16 | long ret; |
| 17 | if (off & OFF_MASK) { |
| 18 | errno = EINVAL; |
| 19 | return MAP_FAILED; |
| 20 | } |
| 21 | if (len >= PTRDIFF_MAX) { |
| 22 | errno = ENOMEM; |
| 23 | return MAP_FAILED; |
| 24 | } |
| 25 | if (flags & MAP_FIXED) { |
| 26 | __vm_wait(); |
| 27 | } |
| 28 | #ifdef SYS_mmap2 |
| 29 | ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT); |
| 30 | #else |
| 31 | ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off); |
| 32 | #endif |
| 33 | /* Fixup incorrect EPERM from kernel. */ |
| 34 | if (ret == -EPERM && !start && (flags&MAP_ANON) && !(flags&MAP_FIXED)) |
| 35 | ret = -ENOMEM; |
| 36 | return (void *)__syscall_ret(ret); |
| 37 | } |
| 38 | |
| 39 | weak_alias(__mmap, mmap); |