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6793dd51 | 1 | /* File descriptor validity check for posix_spawn file actions. |
04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
6793dd51 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "spawn_int.h" | |
20 | ||
21 | #include <unistd.h> | |
22 | ||
23 | bool | |
6793dd51 FW |
24 | __spawn_valid_fd (int fd) |
25 | { | |
26 | long maxfd = __sysconf (_SC_OPEN_MAX); | |
27 | return __glibc_likely (fd >= 0) | |
28 | && (__glibc_unlikely (maxfd < 0) /* No limit set. */ | |
29 | || __glibc_likely (fd < maxfd)); | |
30 | } |