1 diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c
5 +++ b/gzip/lib/getdtablesize.c
7 +/* getdtablesize() function for platforms that don't have it.
8 + Copyright (C) 2008-2010 Free Software Foundation, Inc.
9 + Written by Bruno Haible <bruno@clisp.org>, 2008.
11 + This program is free software: you can redistribute it and/or modify
12 + it under the terms of the GNU General Public License as published by
13 + the Free Software Foundation; either version 3 of the License, or
14 + (at your option) any later version.
16 + This program is distributed in the hope that it will be useful,
17 + but WITHOUT ANY WARRANTY; without even the implied warranty of
18 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 + GNU General Public License for more details.
21 + You should have received a copy of the GNU General Public License
22 + along with this program. If not, see <http://www.gnu.org/licenses/>. */
29 +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
33 +/* Cache for the previous getdtablesize () result. */
34 +static int dtablesize;
39 + if (dtablesize == 0)
41 + /* We are looking for the number N such that the valid file descriptors
42 + are 0..N-1. It can be obtained through a loop as follows:
45 + for (fd = 3; fd < 65536; fd++)
46 + if (dup2 (0, fd) == -1)
50 + On Windows XP, the result is 2048.
51 + The drawback of this loop is that it allocates memory for a libc
52 + internal array that is never freed.
54 + The number N can also be obtained as the upper bound for
55 + _getmaxstdio (). _getmaxstdio () returns the maximum number of open
56 + FILE objects. The sanity check in _setmaxstdio reveals the maximum
57 + number of file descriptors. This too allocates memory, but it is
58 + freed when we call _setmaxstdio with the original value. */
59 + int orig_max_stdio = _getmaxstdio ();
61 + for (bound = 0x10000; _setmaxstdio (bound) < 0; bound = bound / 2)
63 + _setmaxstdio (orig_max_stdio);
70 diff --git a/gzip/m4/getdtablesize.m4 b/gzip/m4/getdtablesize.m4
72 index 0000000..d238628
74 +++ b/gzip/m4/getdtablesize.m4
76 +# getdtablesize.m4 serial 1
77 +dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
78 +dnl This file is free software; the Free Software Foundation
79 +dnl gives unlimited permission to copy and/or distribute it,
80 +dnl with or without modifications, as long as this notice is preserved.
82 +AC_DEFUN([gl_FUNC_GETDTABLESIZE],
84 + AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
85 + AC_CHECK_FUNCS_ONCE([getdtablesize])
86 + if test $ac_cv_func_getdtablesize != yes; then
87 + HAVE_GETDTABLESIZE=0
88 + AC_LIBOBJ([getdtablesize])