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annotate m4/dup2.m4 @ 12421:e8d2c6fc33ad

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Use spaces for indentation, not tabs.
author Bruno Haible <bruno@clisp.org>
date Thu, 10 Dec 2009 20:28:30 +0100
parents 4e193de62444
children c2cbabec01dd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #serial 10
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2 dnl Copyright (C) 2002, 2005, 2007, 2009 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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7c1a6b73f48e An autoconf macro for its associated module.
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6
7c1a6b73f48e An autoconf macro for its associated module.
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7 AC_DEFUN([gl_FUNC_DUP2],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([AC_CANONICAL_HOST])
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11 AC_CHECK_FUNCS_ONCE([dup2])
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12 if test $ac_cv_func_dup2 = no; then
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13 HAVE_DUP2=0
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14 AC_LIBOBJ([dup2])
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15 else
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16 AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
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17 [AC_RUN_IFELSE([
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18 AC_LANG_PROGRAM([[#include <unistd.h>
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19 #include <errno.h>]],
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20 [if (dup2 (1, 1) == 0)
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21 return 1;
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22 close (0);
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23 if (dup2 (0, 0) != -1)
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24 return 2;
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25 /* Many gnulib modules require POSIX conformance of EBADF. */
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26 if (dup2 (1, 1000000) == -1 && errno != EBADF)
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27 return 3;
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28 return 0;
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29 ])
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30 ],
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31 [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
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32 [case "$host_os" in
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33 mingw*) # on this platform, dup2 always returns 0 for success
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34 gl_cv_func_dup2_works=no;;
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35 cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0
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36 gl_cv_func_dup2_works=no;;
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37 linux*) # On linux between 2008-07-27 and 2009-05-11, dup2 of a
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38 # closed fd may yield -EBADF instead of -1 / errno=EBADF.
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39 gl_cv_func_dup2_works=no;;
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40 freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF.
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41 gl_cv_func_dup2_works=no;;
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42 *) gl_cv_func_dup2_works=yes;;
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43 esac])
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44 ])
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45 if test "$gl_cv_func_dup2_works" = no; then
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46 gl_REPLACE_DUP2
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47 fi
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48 fi
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49 ])
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50
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51 AC_DEFUN([gl_REPLACE_DUP2],
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52 [
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53 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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parents: 12148
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54 if test $ac_cv_func_dup2 = yes; then
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55 REPLACE_DUP2=1
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56 fi
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57 AC_LIBOBJ([dup2])
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58 ])