1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"
int __dup3(int old, int new, int flags)
{
int r;
#ifdef SYS_dup2
if (old==new) return __syscall_ret(-EINVAL);
if (flags) {
while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
if (r!=-ENOSYS) return __syscall_ret(r);
if (flags & ~O_CLOEXEC) return __syscall_ret(-EINVAL);
}
while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
if (r >= 0 && (flags & O_CLOEXEC))
__syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
#else
while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
#endif
return __syscall_ret(r);
}
weak_alias(__dup3, dup3);
|