glibc/sysdeps/unix/sysv/linux/getrlimit64.c

/* Copyright (C) 2010-2015 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, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sysdep.h>
#include <kernel-features.h>

/* Put the soft and hard limits for RESOURCE in *RLIMITS.
   Returns 0 if successful, -1 if not (and sets errno).  */
int
__getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
{
#ifdef __ASSUME_PRLIMIT64
  return INLINE_SYSCALL_RETURN (prlimit64, 4, int, 0, resource,
				NULL, rlimits);
#else
# ifdef __NR_prlimit64
  INTERNAL_SYSCALL_DECL (err);
  int res = INTERNAL_SYSCALL (prlimit64, err, 4, 0, resource, NULL,
			      rlimits);
  if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))
      || INTERNAL_SYSCALL_ERRNO (res, err) != ENOSYS)
    return res;
# endif
  struct rlimit rlimits32;

  if (__getrlimit (resource, &rlimits32) < 0)
    return -1;

  if (rlimits32.rlim_cur == RLIM_INFINITY)
    rlimits->rlim_cur = RLIM64_INFINITY;
  else
    rlimits->rlim_cur = rlimits32.rlim_cur;
  if (rlimits32.rlim_max == RLIM_INFINITY)
    rlimits->rlim_max = RLIM64_INFINITY;
  else
    rlimits->rlim_max = rlimits32.rlim_max;

  return 0;
#endif
}
libc_hidden_def (__getrlimit64)
#ifndef getrlimit64
weak_alias (__getrlimit64, getrlimit64)
libc_hidden_weak (getrlimit64)
#endif