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