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6d7e8eda | 1 | /* Copyright (C) 1991-2023 Free Software Foundation, Inc. |
478b92f0 | 2 | This file is part of the GNU C Library. |
d2f5be2a | 3 | |
478b92f0 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
d2f5be2a | 8 | |
478b92f0 UD |
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. |
d2f5be2a | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
d2f5be2a | 17 | |
9756dfe1 UD |
18 | #include <errno.h> |
19 | #include <stdarg.h> | |
d2f5be2a | 20 | #include <sysdep.h> |
af69217f | 21 | #include <ulimit.h> |
d2f5be2a | 22 | #include <unistd.h> |
92a601b8 | 23 | #include <limits.h> |
9756dfe1 | 24 | #include <sys/resource.h> |
d2f5be2a UD |
25 | |
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 | |
33 | can open. | |
34 | Returns -1 on errors. */ | |
35 | long int | |
9756dfe1 | 36 | __ulimit (int cmd, ...) |
d2f5be2a | 37 | { |
9756dfe1 UD |
38 | struct rlimit limit; |
39 | va_list va; | |
40 | long int result = -1; | |
41 | ||
42 | va_start (va, cmd); | |
d2f5be2a UD |
43 | |
44 | switch (cmd) | |
45 | { | |
9756dfe1 UD |
46 | case UL_GETFSIZE: |
47 | /* Get limit on file size. */ | |
50304ef0 | 48 | if (__getrlimit (RLIMIT_FSIZE, &limit) == 0) |
d2f5be2a | 49 | /* Convert from bytes to 512 byte units. */ |
dbb6ab3e UD |
50 | result = (limit.rlim_cur == RLIM_INFINITY |
51 | ? LONG_MAX : limit.rlim_cur / 512); | |
9756dfe1 UD |
52 | break; |
53 | ||
54 | case UL_SETFSIZE: | |
d2f5be2a UD |
55 | /* Set limit on file size. */ |
56 | { | |
9756dfe1 | 57 | long int newlimit = va_arg (va, long int); |
dbb6ab3e | 58 | long int newlen; |
9756dfe1 | 59 | |
61423e13 UD |
60 | if ((rlim_t) newlimit > RLIM_INFINITY / 512) |
61 | { | |
62 | limit.rlim_cur = RLIM_INFINITY; | |
63 | limit.rlim_max = RLIM_INFINITY; | |
dbb6ab3e | 64 | newlen = LONG_MAX; |
61423e13 UD |
65 | } |
66 | else | |
67 | { | |
68 | limit.rlim_cur = newlimit * 512; | |
69 | limit.rlim_max = newlimit * 512; | |
dbb6ab3e | 70 | newlen = newlimit; |
61423e13 | 71 | } |
c4029823 | 72 | |
4aebaa6b | 73 | result = __setrlimit (RLIMIT_FSIZE, &limit); |
dbb6ab3e UD |
74 | if (result != -1) |
75 | result = newlen; | |
d2f5be2a | 76 | } |
9756dfe1 UD |
77 | break; |
78 | ||
79 | case __UL_GETOPENMAX: | |
50304ef0 | 80 | result = __sysconf (_SC_OPEN_MAX); |
9756dfe1 | 81 | break; |
d2f5be2a UD |
82 | |
83 | default: | |
c4029823 | 84 | __set_errno (EINVAL); |
d2f5be2a | 85 | } |
9756dfe1 UD |
86 | |
87 | va_end (va); | |
88 | ||
89 | return result; | |
d2f5be2a UD |
90 | } |
91 | ||
92 | weak_alias (__ulimit, ulimit); |