1 diff --git a/configure.ac b/configure.ac
2 index 818dbd9..0919132 100644
5 @@ -129,6 +129,12 @@ if test "$gl_gcc_warnings" = yes; then
6 AC_SUBST([GNULIB_WARN_CFLAGS])
10 +if test $HAVE_GETDTABLESIZE = 0; then
11 + AC_LIBOBJ([getdtablesize])
13 +gl_UNISTD_MODULE_INDICATOR([getdtablesize])
15 # cc -E produces incorrect asm files on SVR4, so postprocess it.
16 ASCPPPOST="sed '/^ *#/d; s,//.*,,; s/% /%/g; s/\\. /./g'"
18 diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c
20 index 0000000..60e7f5a
22 +++ b/lib/getdtablesize.c
24 +/* getdtablesize() function for platforms that don't have it.
25 + Copyright (C) 2008-2011 Free Software Foundation, Inc.
26 + Written by Bruno Haible <bruno@clisp.org>, 2008.
28 + This program is free software: you can redistribute it and/or modify
29 + it under the terms of the GNU General Public License as published by
30 + the Free Software Foundation; either version 3 of the License, or
31 + (at your option) any later version.
33 + This program is distributed in the hope that it will be useful,
34 + but WITHOUT ANY WARRANTY; without even the implied warranty of
35 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
36 + GNU General Public License for more details.
38 + You should have received a copy of the GNU General Public License
39 + along with this program. If not, see <http://www.gnu.org/licenses/>. */
46 +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
50 +/* Cache for the previous getdtablesize () result. */
51 +static int dtablesize;
56 + if (dtablesize == 0)
58 + /* We are looking for the number N such that the valid file descriptors
59 + are 0..N-1. It can be obtained through a loop as follows:
62 + for (fd = 3; fd < 65536; fd++)
63 + if (dup2 (0, fd) == -1)
67 + On Windows XP, the result is 2048.
68 + The drawback of this loop is that it allocates memory for a libc
69 + internal array that is never freed.
71 + The number N can also be obtained as the upper bound for
72 + _getmaxstdio (). _getmaxstdio () returns the maximum number of open
73 + FILE objects. The sanity check in _setmaxstdio reveals the maximum
74 + number of file descriptors. This too allocates memory, but it is
75 + freed when we call _setmaxstdio with the original value. */
76 + int orig_max_stdio = _getmaxstdio ();
78 + for (bound = 0x10000; _setmaxstdio (bound) < 0; bound = bound / 2)
80 + _setmaxstdio (orig_max_stdio);
87 diff --git a/m4/getdtablesize.m4 b/m4/getdtablesize.m4
89 index 0000000..40a598b
91 +++ b/m4/getdtablesize.m4
93 +# getdtablesize.m4 serial 2
94 +dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
95 +dnl This file is free software; the Free Software Foundation
96 +dnl gives unlimited permission to copy and/or distribute it,
97 +dnl with or without modifications, as long as this notice is preserved.
99 +AC_DEFUN([gl_FUNC_GETDTABLESIZE],
101 + AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
102 + AC_CHECK_FUNCS_ONCE([getdtablesize])
103 + if test $ac_cv_func_getdtablesize != yes; then
104 + HAVE_GETDTABLESIZE=0