sysdeps/unix/sysv/linux/ulimit.c

   1 /* Copyright (C) 1991, 92, 94, 95, 96 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <sysdep.h>
  20 #include <sys/resource.h>
  21 #include <unistd.h>
  22 #include <errno.h>
  23
  24 /* Function depends on CMD:
  25    1 = Return the limit on the size of a file, in units of 512 bytes.
  26    2 = Set the limit on the size of a file to NEWLIMIT.  Only the
  27        super-user can increase the limit.
  28    3 = illegal due to shared libraries; normally is
  29        (Return the maximum possible address of the data segment.)
  30    4 = Return the maximum number of files that the calling process
  31        can open.
  32    Returns -1 on errors.  */
  33 long int
  34 __ulimit (cmd, newlimit)
  35      int cmd;
  36      long int newlimit;
  37 {
  38   int status;
  39
  40   switch (cmd)
  41     {
  42     case 1:
  43       {
  44         /* Get limit on file size.  */
  45         struct rlimit fsize;
  46
  47         status = getrlimit (RLIMIT_FSIZE, &fsize);
  48         if (status < 0)
  49           return -1;
  50
  51         /* Convert from bytes to 512 byte units.  */
  52         return fsize.rlim_cur / 512;
  53       }
  54     case 2:
  55       /* Set limit on file size.  */
  56       {
  57         struct rlimit fsize;
  58         fsize.rlim_cur = newlimit * 512;
  59         fsize.rlim_max = newlimit * 512;
  60
  61         return setrlimit (RLIMIT_FSIZE, &fsize);
  62       }
  63     case 4:
  64       return sysconf (_SC_OPEN_MAX);
  65
  66     default:
  67       __set_errno (EINVAL);
  68       return -1;
  69     }
  70 }
  71
  72 weak_alias (__ulimit, ulimit);