/* Copyright (C) 1991-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stdarg.h>

#include <sysdep.h>

#include <ulimit.h>

#include <unistd.h>

#include <limits.h>

#include <sys/resource.h>

/* 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 = illegal due to shared libraries; normally is

       (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 int

__ulimit (int cmd, ...)

{

  struct rlimit limit;

  va_list va;

  long int result = -1;

  va_start (va, cmd);

  switch (cmd)

    {

    case UL_GETFSIZE:

      /* Get limit on file size.  */

      if (__getrlimit (RLIMIT_FSIZE, &limit) == 0)

	/* Convert from bytes to 512 byte units.  */

	result =  (limit.rlim_cur == RLIM_INFINITY

		   ? LONG_MAX : limit.rlim_cur / 512);

      break;

    case UL_SETFSIZE:

      /* Set limit on file size.  */

      {

	long int newlimit = va_arg (va, long int);

	long int newlen;

	if ((rlim_t) newlimit > RLIM_INFINITY / 512)

	  {

	    limit.rlim_cur = RLIM_INFINITY;

	    limit.rlim_max = RLIM_INFINITY;

	    newlen = LONG_MAX;

	  }

	else

	  {

	    limit.rlim_cur = newlimit * 512;

	    limit.rlim_max = newlimit * 512;

	    newlen = newlimit;

	  }

	result = __setrlimit (RLIMIT_FSIZE, &limit);

	if (result != -1)

	  result = newlen;

      }

      break;

    case __UL_GETOPENMAX:

      result = __sysconf (_SC_OPEN_MAX);

      break;

    default:

      __set_errno (EINVAL);

    }

  va_end (va);

  return result;

}

weak_alias (__ulimit, ulimit);