sysdeps/unix/sysv/linux/setrlimit.c

   1 /* Copyright (C) 1999 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/param.h>
  21 #include <sys/resource.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #include "kernel-features.h"
  27
  28
  29 /* Linux 2.3.25 introduced a new system call since the types used for
  30    the limits are now unsigned.  */
  31 #if !defined __ASSUME_NEW_GETRLIMIT_SYSCALL && defined __NR_ugetrlimit
  32 static int no_new_getrlimit;
  33 #else
  34 # define no_new_getrlimit       0
  35 #endif
  36
  37 int
  38 __setrlimit (resource, rlimits)
  39      enum __rlimit_resource resource;
  40      const struct rlimit *rlimits;
  41 {
  42 #ifdef __NR_ugetrlimit
  43   if (! no_new_getrlimit)
  44     {
  45       int result = INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
  46
  47 # ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  48       /* If the system call is available return.  */
  49       if (result != -1 || errno != ENOSYS)
  50 # endif
  51         return result;
  52
  53 # ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  54       /* Remember that the system call is not available.  */
  55       no_new_getrlimit = 1;
  56 # endif
  57     }
  58 #endif
  59
  60 #ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  61   /* We might have to correct the limits values.  Since the old values
  62      were signed the new values are too large.  */
  63   rlimits.rlim_cur = MIN ((unsigned long int) rlimits.rlim_cur,
  64                           RLIM_INFINITY >> 2);
  65   rlimits.rlim_max = MIN ((unsigned long int) rlimits.rlim_max,
  66                           RLIM_INFINITY >> 2);
  67
  68   /* Fall back on the old system call.  */
  69   return INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
  70 #endif
  71 }
  72 weak_alias (__setrlimit, setrlimit)