]>
Commit | Line | Data |
---|---|---|
c4029823 | 1 | /* Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc. |
28f540f4 RM |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
28f540f4 RM |
19 | #include <errno.h> |
20 | #include <fcntl.h> | |
21 | #include <limits.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | ||
25 | /* Duplicate FD to FD2, closing the old FD2 and making FD2 be | |
26 | open the same file as FD is. Return FD2 or -1. */ | |
27 | int | |
c4029823 UD |
28 | __dup2 (fd, fd2) |
29 | int fd; | |
30 | int fd2; | |
28f540f4 RM |
31 | { |
32 | int save; | |
33 | ||
34 | if (fd2 < 0 | |
35 | #ifdef OPEN_MAX | |
36 | || fd2 >= OPEN_MAX | |
37 | #endif | |
38 | ) | |
39 | { | |
c4029823 | 40 | __set_errno (EBADF); |
28f540f4 RM |
41 | return -1; |
42 | } | |
43 | ||
44 | /* Check if FD is kosher. */ | |
45 | if (fcntl (fd, F_GETFL) < 0) | |
46 | return -1; | |
47 | ||
48 | if (fd == fd2) | |
49 | return fd2; | |
50 | ||
51 | /* This is not atomic. */ | |
52 | ||
53 | save = errno; | |
54 | (void) close (fd2); | |
c4029823 | 55 | __set_errno (save); |
28f540f4 RM |
56 | |
57 | return fcntl (fd, F_DUPFD, fd2); | |
58 | } | |
59 | ||
60 | weak_alias (__dup2, dup2) |