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glibc/sysdeps/unix/sysv/linux/i386/setrlimit.c
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/* Copyright (C) 1999, 2000 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 Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <sys/param.h> | |
#include <sys/resource.h> | |
#include <sysdep.h> | |
#include <sys/syscall.h> | |
#include <shlib-compat.h> | |
#include <bp-checks.h> | |
#include "kernel-features.h" | |
extern int __syscall_setrlimit (unsigned int resource, | |
const struct rlimit *__unbounded rlimits); | |
extern int __syscall_ugetrlimit (unsigned int resource, | |
const struct rlimit *__unbounded rlimits); | |
extern int __new_setrlimit (enum __rlimit_resource resource, | |
const struct rlimit *__unboundedrlimits); | |
/* Linux 2.3.25 introduced a new system call since the types used for | |
the limits are now unsigned. */ | |
#if defined __NR_ugetrlimit && !defined __ASSUME_NEW_GETRLIMIT_SYSCALL | |
extern int __have_no_new_getrlimit; /* from getrlimit.c */ | |
#endif | |
int | |
__new_setrlimit (enum __rlimit_resource resource, const struct rlimit *rlimits) | |
{ | |
#ifdef __ASSUME_NEW_GETRLIMIT_SYSCALL | |
return INLINE_SYSCALL (setrlimit, 2, resource, CHECK_1 (rlimits)); | |
#else | |
struct rlimit rlimits_small; | |
# ifdef __NR_ugetrlimit | |
if (__have_no_new_getrlimit == 0) | |
{ | |
/* Check if the new ugetrlimit syscall exists. We must do this | |
first because older kernels don't reject negative rlimit | |
values in setrlimit. */ | |
int result = INLINE_SYSCALL (ugetrlimit, 2, resource, __ptrvalue (&rlimits_small)); | |
if (result != -1 || errno != ENOSYS) | |
/* The syscall exists. */ | |
__have_no_new_getrlimit = -1; | |
else | |
/* The syscall does not exist. */ | |
__have_no_new_getrlimit = 1; | |
} | |
if (__have_no_new_getrlimit < 0) | |
return INLINE_SYSCALL (setrlimit, 2, resource, CHECK_1 (rlimits)); | |
# endif | |
/* We might have to correct the limits values. Since the old values | |
were signed the new values might be too large. */ | |
rlimits_small.rlim_cur = MIN ((unsigned long int) rlimits->rlim_cur, | |
RLIM_INFINITY >> 1); | |
rlimits_small.rlim_max = MIN ((unsigned long int) rlimits->rlim_max, | |
RLIM_INFINITY >> 1); | |
/* Use the adjusted values. */ | |
return INLINE_SYSCALL (setrlimit, 2, resource, __ptrvalue (&rlimits_small)); | |
#endif | |
} | |
weak_alias (__new_setrlimit, __setrlimit); | |
versioned_symbol (libc, __new_setrlimit, setrlimit, GLIBC_2_2); |