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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
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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 | |
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5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
478b92f0 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
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18 | #include <errno.h> |
19 | #include <fcntl.h> | |
20 | #include <limits.h> | |
21 | #include <unistd.h> | |
22 | ||
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23 | /* Duplicate FD to FD2, closing the old FD2 and making FD2 be |
24 | open the same file as FD is. Return FD2 or -1. */ | |
25 | int | |
bd2260a2 | 26 | __dup2 (int fd, int fd2) |
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27 | { |
28 | int save; | |
29 | ||
30 | if (fd2 < 0 | |
31 | #ifdef OPEN_MAX | |
32 | || fd2 >= OPEN_MAX | |
33 | #endif | |
34 | ) | |
35 | { | |
c4029823 | 36 | __set_errno (EBADF); |
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37 | return -1; |
38 | } | |
39 | ||
40 | /* Check if FD is kosher. */ | |
41 | if (fcntl (fd, F_GETFL) < 0) | |
42 | return -1; | |
43 | ||
44 | if (fd == fd2) | |
45 | return fd2; | |
46 | ||
47 | /* This is not atomic. */ | |
48 | ||
49 | save = errno; | |
50 | (void) close (fd2); | |
c4029823 | 51 | __set_errno (save); |
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52 | |
53 | return fcntl (fd, F_DUPFD, fd2); | |
54 | } | |
37ba7d66 | 55 | libc_hidden_def (__dup2) |
28f540f4 | 56 | weak_alias (__dup2, dup2) |