| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1991-2016 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 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <errno.h> |
| 19 | #include <stdarg.h> |
| 20 | #include <sysdep.h> |
| 21 | #include <ulimit.h> |
| 22 | #include <unistd.h> |
| 23 | #include <limits.h> |
| 24 | #include <sys/resource.h> |
| 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 |
| 36 | __ulimit (int cmd, ...) |
| 37 | { |
| 38 | struct rlimit limit; |
| 39 | va_list va; |
| 40 | long int result = -1; |
| 41 | |
| 42 | va_start (va, cmd); |
| 43 | |
| 44 | switch (cmd) |
| 45 | { |
| 46 | case UL_GETFSIZE: |
| 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); |
| 52 | break; |
| 53 | |
| 54 | case UL_SETFSIZE: |
| 55 | /* Set limit on file size. */ |
| 56 | { |
| 57 | long int newlimit = va_arg (va, long int); |
| 58 | long int newlen; |
| 59 | |
| 60 | if ((rlim_t) newlimit > RLIM_INFINITY / 512) |
| 61 | { |
| 62 | limit.rlim_cur = RLIM_INFINITY; |
| 63 | limit.rlim_max = RLIM_INFINITY; |
| 64 | newlen = LONG_MAX; |
| 65 | } |
| 66 | else |
| 67 | { |
| 68 | limit.rlim_cur = newlimit * 512; |
| 69 | limit.rlim_max = newlimit * 512; |
| 70 | newlen = newlimit; |
| 71 | } |
| 72 | |
| 73 | result = __setrlimit (RLIMIT_FSIZE, &limit); |
| 74 | if (result != -1) |
| 75 | result = newlen; |
| 76 | } |
| 77 | break; |
| 78 | |
| 79 | case __UL_GETOPENMAX: |
| 80 | result = __sysconf (_SC_OPEN_MAX); |
| 81 | break; |
| 82 | |
| 83 | default: |
| 84 | __set_errno (EINVAL); |
| 85 | } |
| 86 | |
| 87 | va_end (va); |
| 88 | |
| 89 | return result; |
| 90 | } |
| 91 | |
| 92 | weak_alias (__ulimit, ulimit); |