sysdeps/unix/bsd/ulimit.c

   1 /* Copyright (C) 1991, 1992, 1994, 1996 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 #ifndef  HAVE_GNU_LD
  25 #define  _etext etext
  26 #endif
  27
  28 extern int _etext;
  29
  30 /* Function depends on CMD:
  31    1 = Return the limit on the size of a file, in units of 512 bytes.
  32    2 = Set the limit on the size of a file to NEWLIMIT.  Only the
  33        super-user can increase the limit.
  34    3 = Return the maximum possible address of the data segment.
  35    4 = Return the maximum number of files that the calling process
  36        can open.
  37    Returns -1 on errors.  */
  38 long int
  39 ulimit (cmd, newlimit)
  40      int cmd;
  41      long int newlimit;
  42 {
  43   int status;
  44
  45   switch (cmd)
  46     {
  47     case 1:
  48       {
  49         /* Get limit on file size.  */
  50         struct rlimit fsize;
  51
  52         status = getrlimit (RLIMIT_FSIZE, &fsize);
  53         if (status < 0)
  54           return -1;
  55
  56         /* Convert from bytes to 512 byte units.  */
  57         return fsize.rlim_cur / 512;
  58       }
  59     case 2:
  60       /* Set limit on file size.  */
  61       {
  62         struct rlimit fsize;
  63         fsize.rlim_cur = newlimit * 512;
  64         fsize.rlim_max = newlimit * 512;
  65
  66         return setrlimit (RLIMIT_FSIZE, &fsize);
  67       }
  68     case 3:
  69       /* Get maximum address for `brk'.  */
  70       {
  71         struct rlimit dsize;
  72
  73         status = getrlimit (RLIMIT_DATA, &dsize);
  74         if (status < 0)
  75           return -1;
  76
  77         return ((long int) &_etext) + dsize.rlim_cur;
  78       }
  79     case 4:
  80       return sysconf (_SC_OPEN_MAX);
  81
  82     default:
  83       __set_errno (EINVAL);
  84       return -1;
  85     }
  86 }