1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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 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.
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 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <limits.h>
19 #include <unistd.h>
20 #include <sys/resource.h>
21
22 /* Return the maximum number of file descriptors
23 the current process could possibly have. */
24 int
__getdtablesize(void)25 __getdtablesize (void)
26 {
27 struct rlimit ru;
28
29 /* This should even work if `getrlimit' is not implemented. POSIX.1
30 does not define this function but we will generate a stub which
31 returns -1. */
32 return __getrlimit (RLIMIT_NOFILE, &ru) < 0 ? OPEN_MAX : ru.rlim_cur;
33 }
34
35 weak_alias (__getdtablesize, getdtablesize)
36