AC_SUBST([GNULIB_WARN_CFLAGS])
fi
+gl_FUNC_GETDTABLESIZE
+if test $HAVE_GETDTABLESIZE = 0; then
+ AC_LIBOBJ([getdtablesize])
+fi
+gl_UNISTD_MODULE_INDICATOR([getdtablesize])
+
# cc -E produces incorrect asm files on SVR4, so postprocess it.
ASCPPPOST="sed '/^ *#/d; s,//.*,,; s/% /%/g; s/\\. /./g'"
AC_SUBST([ASCPPPOST])
--- /dev/null
+/* getdtablesize() function for platforms that don't have it.
+ Copyright (C) 2008-2011 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
--- /dev/null
+# getdtablesize.m4 serial 2
+dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_GETDTABLESIZE],
+[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([getdtablesize])
+ if test $ac_cv_func_getdtablesize != yes; then
+ HAVE_GETDTABLESIZE=0
+ fi
+])