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glibc/sysdeps/unix/sysv/linux/ulimit.c
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/* Copyright (C) 1991,92,1994-1998,2000,2001,2008 | |
Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <errno.h> | |
#include <stdarg.h> | |
#include <sysdep.h> | |
#include <ulimit.h> | |
#include <unistd.h> | |
#include <sys/resource.h> | |
/* Function depends on CMD: | |
1 = Return the limit on the size of a file, in units of 512 bytes. | |
2 = Set the limit on the size of a file to NEWLIMIT. Only the | |
super-user can increase the limit. | |
3 = illegal due to shared libraries; normally is | |
(Return the maximum possible address of the data segment.) | |
4 = Return the maximum number of files that the calling process | |
can open. | |
Returns -1 on errors. */ | |
long int | |
__ulimit (int cmd, ...) | |
{ | |
struct rlimit limit; | |
va_list va; | |
long int result = -1; | |
va_start (va, cmd); | |
switch (cmd) | |
{ | |
case UL_GETFSIZE: | |
/* Get limit on file size. */ | |
if (__getrlimit (RLIMIT_FSIZE, &limit) == 0) | |
/* Convert from bytes to 512 byte units. */ | |
result = (limit.rlim_cur == RLIM_INFINITY | |
? LONG_MAX : limit.rlim_cur / 512); | |
break; | |
case UL_SETFSIZE: | |
/* Set limit on file size. */ | |
{ | |
long int newlimit = va_arg (va, long int); | |
long int newlen; | |
if ((rlim_t) newlimit > RLIM_INFINITY / 512) | |
{ | |
limit.rlim_cur = RLIM_INFINITY; | |
limit.rlim_max = RLIM_INFINITY; | |
newlen = LONG_MAX; | |
} | |
else | |
{ | |
limit.rlim_cur = newlimit * 512; | |
limit.rlim_max = newlimit * 512; | |
newlen = newlimit; | |
} | |
result = __setrlimit (RLIMIT_FSIZE, &limit); | |
if (result != -1) | |
result = newlen; | |
} | |
break; | |
case __UL_GETOPENMAX: | |
result = __sysconf (_SC_OPEN_MAX); | |
break; | |
default: | |
__set_errno (EINVAL); | |
} | |
va_end (va); | |
return result; | |
} | |
weak_alias (__ulimit, ulimit); |