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87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <sysdep.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <errno.h>
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#ifndef HAVE_GNU_LD
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#define _etext etext
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#endif
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extern int _etext;
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/* Function depends on CMD:
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1 = Return the limit on the size of a file, in units of 512 bytes.
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2 = Set the limit on the size of a file to NEWLIMIT. Only the
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super-user can increase the limit.
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3 = Return the maximum possible address of the data segment.
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4 = Return the maximum number of files that the calling process
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can open.
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Returns -1 on errors. */
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long int
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DEFUN(ulimit, (cmd, newlimit),
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int cmd AND long int newlimit)
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{
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int status;
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switch (cmd)
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{
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case 1:
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{
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/* Get limit on file size. */
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struct rlimit fsize;
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status = getrlimit(RLIMIT_FSIZE, &fsize);
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if (status < 0)
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return -1;
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/* Convert from bytes to 512 byte units. */
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return fsize.rlim_cur / 512;
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}
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case 2:
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/* Set limit on file size. */
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{
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struct rlimit fsize;
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fsize.rlim_cur = newlimit * 512;
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fsize.rlim_max = newlimit * 512;
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return setrlimit(RLIMIT_FSIZE, &fsize);
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}
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case 3:
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/* Get maximum address for `brk'. */
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{
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struct rlimit dsize;
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status = getrlimit(RLIMIT_DATA, &dsize);
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if (status < 0)
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return -1;
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return ((long int) &_etext) + dsize.rlim_cur;
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}
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case 4:
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return sysconf(_SC_OPEN_MAX);
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default:
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errno = EINVAL;
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return -1;
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}
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}
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