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