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-rw-r--r--gl/getdtablesize.c63
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diff --git a/gl/getdtablesize.c b/gl/getdtablesize.c
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-/* getdtablesize() function for platforms that don't have it.
- Copyright (C) 2008-2010 Free Software Foundation, Inc.
- Written by Bruno Haible <bruno@clisp.org>, 2008.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-/* Specification. */
-#include <unistd.h>
-
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
-
-#include <stdio.h>
-
-/* Cache for the previous getdtablesize () result. */
-static int dtablesize;
-
-int
-getdtablesize (void)
-{
- if (dtablesize == 0)
- {
- /* We are looking for the number N such that the valid file descriptors
- are 0..N-1. It can be obtained through a loop as follows:
- {
- int fd;
- for (fd = 3; fd < 65536; fd++)
- if (dup2 (0, fd) == -1)
- break;
- return fd;
- }
- On Windows XP, the result is 2048.
- The drawback of this loop is that it allocates memory for a libc
- internal array that is never freed.
-
- The number N can also be obtained as the upper bound for
- _getmaxstdio (). _getmaxstdio () returns the maximum number of open
- FILE objects. The sanity check in _setmaxstdio reveals the maximum
- number of file descriptors. This too allocates memory, but it is
- freed when we call _setmaxstdio with the original value. */
- int orig_max_stdio = _getmaxstdio ();
- unsigned int bound;
- for (bound = 0x10000; _setmaxstdio (bound) < 0; bound = bound / 2)
- ;
- _setmaxstdio (orig_max_stdio);
- dtablesize = bound;
- }
- return dtablesize;
-}
-
-#endif