linux-master/fs/file.c

1354 static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
1363 	if (unlikely(oldfd == newfd))
1371 	file = files_lookup_fd_locked(files, oldfd);
1388 SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags)
1390 	return ksys_dup3(oldfd, newfd, flags);
1393 SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
1395 	if (unlikely(newfd == oldfd)) { /* corner case */
1398 		int retval = oldfd;
1401 		f = __fget_files_rcu(files, oldfd, 0);
1409 	return ksys_dup3(oldfd, newfd, 0);