glibc/sysdeps/unix/sysv/linux/setrlimit.c

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/* Copyright (C) 1999 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 "kernel-features.h"
extern int __syscall_setrlimit (unsigned int resource,
const struct rlimit *rlimits);
/* Linux 2.3.25 introduced a new system call since the types used for
the limits are now unsigned. */
#if !defined __ASSUME_NEW_GETRLIMIT_SYSCALL && defined __NR_ugetrlimit
static int no_new_getrlimit;
#else
# define no_new_getrlimit 0
#endif
int
__setrlimit (resource, rlimits)
enum __rlimit_resource resource;
const struct rlimit *rlimits;
{
#ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
struct rlimit rlimits_small;
#endif
#ifdef __NR_ugetrlimit
if (! no_new_getrlimit)
{
int result = INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
# ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
/* If the system call is available return. */
if (result != -1 || errno != ENOSYS)
# endif
return result;
# ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
/* Remember that the system call is not available. */
no_new_getrlimit = 1;
# endif
}
#endif
#ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
/* We might have to correct the limits values. Since the old values
were signed the new values are too large. */
rlimits_small.rlim_cur = MIN ((unsigned long int) rlimits->rlim_cur,
RLIM_INFINITY >> 2);
rlimits_small.rlim_max = MIN ((unsigned long int) rlimits->rlim_max,
RLIM_INFINITY >> 2);
/* Fall back on the old system call. */
return INLINE_SYSCALL (setrlimit, 2, resource, &rlimits_small);
#endif
}
weak_alias (__setrlimit, setrlimit)