acinclude.m4 revision 77683534 
1dnl ---------------------------------------------------------------------------
2dnl
3dnl Copyright 2006-2009,2010 by Thomas E. Dickey
4dnl
5dnl                         All Rights Reserved
6dnl
7dnl Permission to use, copy, modify, and distribute this software and its
8dnl documentation for any purpose and without fee is hereby granted,
9dnl provided that the above copyright notice appear in all copies and that
10dnl both that copyright notice and this permission notice appear in
11dnl supporting documentation, and that the name of the above listed
12dnl copyright holder(s) not be used in advertising or publicity pertaining
13dnl to distribution of the software without specific, written prior
14dnl permission.
15dnl
16dnl THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD
17dnl TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
18dnl AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
19dnl LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
22dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23dnl
24dnl ---------------------------------------------------------------------------
25
26dnl ---------------------------------------------------------------------------
27dnl CF_FUNC_POLL version: 4 updated: 2006/12/16 12:33:30
28dnl ------------
29dnl See if the poll function really works.  Some platforms have poll(), but
30dnl it does not work for terminals or files.
31AC_DEFUN([CF_FUNC_POLL],[
32AC_CACHE_CHECK(if poll really works,cf_cv_working_poll,[
33AC_TRY_RUN([
34#include <stdio.h>
35#ifdef HAVE_POLL_H
36#include <poll.h>
37#else
38#include <sys/poll.h>
39#endif
40int main() {
41	struct pollfd myfds;
42	int ret;
43
44	myfds.fd = 0;
45	myfds.events = POLLIN;
46
47	ret = poll(&myfds, 1, 100);
48	${cf_cv_main_return:-return}(ret != 0);
49}],
50	[cf_cv_working_poll=yes],
51	[cf_cv_working_poll=no],
52	[cf_cv_working_poll=unknown])])
53test "$cf_cv_working_poll" = "yes" && AC_DEFINE(HAVE_WORKING_POLL, 1, [poll() works])
54])dnl
55
56dnl ---------------------------------------------------------------------------
57dnl CF_SIGWINCH version: 1 updated: 2006/04/02 16:41:09
58dnl -----------
59dnl Use this macro after CF_XOPEN_SOURCE, but do not require it (not all
60dnl programs need this test).
61dnl
62dnl This is really a MacOS X 10.4.3 workaround.  Defining _POSIX_C_SOURCE
63dnl forces SIGWINCH to be undefined (breaks xterm, ncurses).  Oddly, the struct
64dnl winsize declaration is left alone - we may revisit this if Apple choose to
65dnl break that part of the interface as well.
66AC_DEFUN([CF_SIGWINCH],
67[
68AC_CACHE_CHECK(if SIGWINCH is defined,cf_cv_define_sigwinch,[
69	AC_TRY_COMPILE([
70#include <sys/types.h>
71#include <sys/signal.h>
72],[int x = SIGWINCH],
73	[cf_cv_define_sigwinch=yes],
74	[AC_TRY_COMPILE([
75#undef _XOPEN_SOURCE
76#undef _POSIX_SOURCE
77#undef _POSIX_C_SOURCE
78#include <sys/types.h>
79#include <sys/signal.h>
80],[int x = SIGWINCH],
81	[cf_cv_define_sigwinch=maybe],
82	[cf_cv_define_sigwinch=no])
83])
84])
85
86if test "$cf_cv_define_sigwinch" = maybe ; then
87AC_CACHE_CHECK(for actual SIGWINCH definition,cf_cv_fixup_sigwinch,[
88cf_cv_fixup_sigwinch=unknown
89cf_sigwinch=32
90while test $cf_sigwinch != 1
91do
92	AC_TRY_COMPILE([
93#undef _XOPEN_SOURCE
94#undef _POSIX_SOURCE
95#undef _POSIX_C_SOURCE
96#include <sys/types.h>
97#include <sys/signal.h>
98],[
99#if SIGWINCH != $cf_sigwinch
100make an error
101#endif
102int x = SIGWINCH],
103	[cf_cv_fixup_sigwinch=$cf_sigwinch
104	 break])
105
106cf_sigwinch=`expr $cf_sigwinch - 1`
107done
108])
109
110	if test "$cf_cv_fixup_sigwinch" != unknown ; then
111		CPPFLAGS="$CPPFLAGS -DSIGWINCH=$cf_cv_fixup_sigwinch"
112	fi
113fi
114])dnl
115
116
117