sysdeps/unix/sysv/linux/ulimit.c

   1 /* Copyright (C) 1991,92,1994-1998,2000,2001 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 <stdarg.h>
  21 #include <sysdep.h>
  22 #include <ulimit.h>
  23 #include <unistd.h>
  24 #include <sys/resource.h>
  25
  26 /* Function depends on CMD:
  27    1 = Return the limit on the size of a file, in units of 512 bytes.
  28    2 = Set the limit on the size of a file to NEWLIMIT.  Only the
  29        super-user can increase the limit.
  30    3 = illegal due to shared libraries; normally is
  31        (Return the maximum possible address of the data segment.)
  32    4 = Return the maximum number of files that the calling process
  33        can open.
  34    Returns -1 on errors.  */
  35 long int
  36 __ulimit (int cmd, ...)
  37 {
  38   struct rlimit limit;
  39   va_list va;
  40   long int result = -1;
  41
  42   va_start (va, cmd);
  43
  44   switch (cmd)
  45     {
  46     case UL_GETFSIZE:
  47       /* Get limit on file size.  */
  48       if (__getrlimit (RLIMIT_FSIZE, &limit) == 0)
  49         /* Convert from bytes to 512 byte units.  */
  50         result =  limit.rlim_cur / 512;
  51       break;
  52
  53     case UL_SETFSIZE:
  54       /* Set limit on file size.  */
  55       {
  56         long int newlimit = va_arg (va, long int);
  57
  58         if ((rlim_t) newlimit > RLIM_INFINITY / 512)
  59           {
  60             limit.rlim_cur = RLIM_INFINITY;
  61             limit.rlim_max = RLIM_INFINITY;
  62           }
  63         else
  64           {
  65             limit.rlim_cur = newlimit * 512;
  66             limit.rlim_max = newlimit * 512;
  67           }
  68
  69         result = __setrlimit (RLIMIT_FSIZE, &limit);
  70       }
  71       break;
  72
  73     case __UL_GETOPENMAX:
  74       result = __sysconf (_SC_OPEN_MAX);
  75       break;
  76
  77     default:
  78       __set_errno (EINVAL);
  79     }
  80
  81   va_end (va);
  82
  83   return result;
  84 }
  85
  86 weak_alias (__ulimit, ulimit);