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 extern int __syscall_setrlimit (unsigned int resource,
  29                                 const struct rlimit *rlimits);
  30
  31 /* Linux 2.3.25 introduced a new system call since the types used for
  32    the limits are now unsigned.  */
  33 #if !defined __ASSUME_NEW_GETRLIMIT_SYSCALL && defined __NR_ugetrlimit
  34 static int no_new_getrlimit;
  35 #else
  36 # define no_new_getrlimit       0
  37 #endif
  38
  39 int
  40 __setrlimit (resource, rlimits)
  41      enum __rlimit_resource resource;
  42      const struct rlimit *rlimits;
  43 {
  44 #ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  45   struct rlimit rlimits_small;
  46 #endif
  47
  48 #ifdef __NR_ugetrlimit
  49   if (! no_new_getrlimit)
  50     {
  51       int result = INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
  52
  53 # ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  54       /* If the system call is available return.  */
  55       if (result != -1 || errno != ENOSYS)
  56 # endif
  57         return result;
  58
  59 # ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  60       /* Remember that the system call is not available.  */
  61       no_new_getrlimit = 1;
  62 # endif
  63     }
  64 #endif
  65
  66 #ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
  67   /* We might have to correct the limits values.  Since the old values
  68      were signed the new values are too large.  */
  69   rlimits_small.rlim_cur = MIN ((unsigned long int) rlimits->rlim_cur,
  70                                 RLIM_INFINITY >> 2);
  71   rlimits_small.rlim_max = MIN ((unsigned long int) rlimits->rlim_max,
  72                                 RLIM_INFINITY >> 2);
  73
  74   /* Fall back on the old system call.  */
  75   return INLINE_SYSCALL (setrlimit, 2, resource, &rlimits_small);
  76 #endif
  77 }
  78 weak_alias (__setrlimit, setrlimit)