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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* Copyright (C) 1991,1992,1994-1998,2001,2005 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdarg.h>
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#include <sysdep.h>
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#include <ulimit.h>
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#include <unistd.h>
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#include <sys/resource.h>
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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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ulimit (int cmd, ...)
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{
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struct rlimit limit;
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va_list va;
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long int result = -1;
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va_start (va, cmd);
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switch (cmd)
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{
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case UL_GETFSIZE:
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/* Get limit on file size. */
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if (getrlimit (RLIMIT_FSIZE, &limit) == 0)
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/* Convert from bytes to 512 byte units. */
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result = limit.rlim_cur / 512;
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break;
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case UL_SETFSIZE:
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/* Set limit on file size. */
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{
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long int newlimit = va_arg (va, long int);
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if ((rlim_t) newlimit > RLIM_INFINITY / 512)
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{
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limit.rlim_cur = RLIM_INFINITY;
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limit.rlim_max = RLIM_INFINITY;
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}
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else
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{
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limit.rlim_cur = newlimit * 512;
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limit.rlim_max = newlimit * 512;
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}
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result = setrlimit (RLIMIT_FSIZE, &limit);
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}
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break;
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case __UL_GETMAXBRK:
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/* Get maximum address for `brk'. */
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if (getrlimit (RLIMIT_DATA, &limit) == 0)
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result = ((long int) &_etext) + limit.rlim_cur;
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break;
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case __UL_GETOPENMAX:
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result = sysconf (_SC_OPEN_MAX);
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break;
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default:
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__set_errno (EINVAL);
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}
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va_end (va);
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return result;
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}
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