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