sysdeps/unix/sysv/linux/i386/getrlimit.c

   1 /* Copyright (C) 1999, 2000, 2003, 2006 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/resource.h>
  21
  22 #include <sysdep.h>
  23 #include <sys/syscall.h>
  24 #include <shlib-compat.h>
  25 #include <bp-checks.h>
  26
  27 #include <kernel-features.h>
  28
  29 extern int __new_getrlimit (enum __rlimit_resource resource,
  30                             struct rlimit *__unbounded rlimits);
  31
  32
  33 /* Linux 2.3.25 introduced a new system call since the types used for
  34    the limits are now unsigned.  */
  35 #if defined __NR_ugetrlimit && !defined __ASSUME_NEW_GETRLIMIT_SYSCALL
  36 int __have_no_new_getrlimit;
  37 #endif
  38
  39 int
  40 __new_getrlimit (enum __rlimit_resource resource, struct rlimit *rlimits)
  41 {
  42 #ifdef __ASSUME_NEW_GETRLIMIT_SYSCALL
  43   return INLINE_SYSCALL (ugetrlimit, 2, resource, CHECK_1 (rlimits));
  44 #else
  45   int result;
  46
  47 # ifdef __NR_ugetrlimit
  48   if (__have_no_new_getrlimit <= 0)
  49     {
  50       result = INLINE_SYSCALL (ugetrlimit, 2, resource, CHECK_1 (rlimits));
  51
  52       /* If the system call is available remember this fact and return.  */
  53       if (result != -1 || errno != ENOSYS)
  54         {
  55           __have_no_new_getrlimit = -1;
  56           return result;
  57         }
  58
  59       /* Remember that the system call is not available.  */
  60       __have_no_new_getrlimit = 1;
  61     }
  62 # endif
  63
  64   /* Fall back to the old system call.  */
  65   result = INLINE_SYSCALL (getrlimit, 2, resource, CHECK_1 (rlimits));
  66
  67   if (result == -1)
  68     return result;
  69
  70   /* We might have to correct the limits values.  Since the old values
  71      were signed the infinity value is too small.  */
  72   if (rlimits->rlim_cur == RLIM_INFINITY >> 1)
  73     rlimits->rlim_cur = RLIM_INFINITY;
  74   if (rlimits->rlim_max == RLIM_INFINITY >> 1)
  75     rlimits->rlim_max = RLIM_INFINITY;
  76
  77   return result;
  78 #endif
  79 }
  80
  81 weak_alias (__new_getrlimit, __getrlimit);
  82 versioned_symbol (libc, __new_getrlimit, getrlimit, GLIBC_2_2);