sysdeps/unix/sysv/linux/ulimit.c

   1 /* Copyright (C) 1991, 1992, 1994, 1995 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 <ansidecl.h>
  20 #include <sysdep.h>
  21 #include <sys/resource.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24
  25 /* Function depends on CMD:
  26    1 = Return the limit on the size of a file, in units of 512 bytes.
  27    2 = Set the limit on the size of a file to NEWLIMIT.  Only the
  28        super-user can increase the limit.
  29    3 = illegal due to shared libraries; normally is
  30        (Return the maximum possible address of the data segment.)
  31    4 = Return the maximum number of files that the calling process
  32        can open.
  33    Returns -1 on errors.  */
  34 long int
  35 __ulimit (cmd, newlimit)
  36      int cmd;
  37      long int newlimit;
  38 {
  39   int status;
  40
  41   switch (cmd)
  42     {
  43     case 1:
  44       {
  45         /* Get limit on file size.  */
  46         struct rlimit fsize;
  47
  48         status = getrlimit(RLIMIT_FSIZE, &fsize);
  49         if (status < 0)
  50           return -1;
  51
  52         /* Convert from bytes to 512 byte units.  */
  53         return fsize.rlim_cur / 512;
  54       }
  55     case 2:
  56       /* Set limit on file size.  */
  57       {
  58         struct rlimit fsize;
  59         fsize.rlim_cur = newlimit * 512;
  60         fsize.rlim_max = newlimit * 512;
  61
  62         return setrlimit(RLIMIT_FSIZE, &fsize);
  63       }
  64     case 4:
  65       return sysconf(_SC_OPEN_MAX);
  66
  67     default:
  68       errno = EINVAL;
  69       return -1;
  70     }
  71 }
  72
  73 weak_alias (__ulimit, ulimit);