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
 8static void dummy(void) { }
 9weak_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
14void *__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
39weak_alias(__mmap, mmap);