1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
24 #include <sys/resource.h>
26 /* Function depends on CMD:
27 1 = Return the limit on the size of a file, in units of 512 bytes.
28 2 = Set the limit on the size of a file to NEWLIMIT. Only the
29 super-user can increase the limit.
30 3 = illegal due to shared libraries; normally is
31 (Return the maximum possible address of the data segment.)
32 4 = Return the maximum number of files that the calling process
34 Returns -1 on errors. */
36 __ulimit (int cmd, ...)
47 /* Get limit on file size. */
48 if (__getrlimit (RLIMIT_FSIZE, &limit) == 0)
49 /* Convert from bytes to 512 byte units. */
50 result = (limit.rlim_cur == RLIM_INFINITY
51 ? LONG_MAX : limit.rlim_cur / 512);
55 /* Set limit on file size. */
57 long int newlimit = va_arg (va, long int);
60 if ((rlim_t) newlimit > RLIM_INFINITY / 512)
62 limit.rlim_cur = RLIM_INFINITY;
63 limit.rlim_max = RLIM_INFINITY;
68 limit.rlim_cur = newlimit * 512;
69 limit.rlim_max = newlimit * 512;
73 result = __setrlimit (RLIMIT_FSIZE, &limit);
80 result = __sysconf (_SC_OPEN_MAX);
92 weak_alias (__ulimit, ulimit);