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| | #include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdint.h>
#include <limits.h>
#include "syscall.h"
static void dummy(void) { }
weak_alias(dummy, __vm_wait);
#define UNIT SYSCALL_MMAP2_UNIT
#define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1))
void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
{
long ret;
if (off & OFF_MASK) {
errno = EINVAL;
return MAP_FAILED;
}
if (len >= PTRDIFF_MAX) {
errno = ENOMEM;
return MAP_FAILED;
}
if (flags & MAP_FIXED) {
__vm_wait();
}
#ifdef SYS_mmap2
ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
#else
ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
#endif
/* Fixup incorrect EPERM from kernel. */
if (ret == -EPERM && !start && (flags&MAP_ANON) && !(flags&MAP_FIXED))
ret = -ENOMEM;
return (void *)__syscall_ret(ret);
}
weak_alias(__mmap, mmap);
weak_alias(mmap, mmap64);
|