Mercurial > hg > octave-lojdl > gnulib-hg

annotate m4/poll.m4 @ 6749:912476e213eb

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Rearrange code.
author Bruno Haible <bruno@clisp.org>
date Mon, 24 Apr 2006 11:33:54 +0000
parents 427cd89c6d7b
children 8eedfb060b79
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6748
427cd89c6d7b AIX 5.3 also has a broken poll(), reported Ralf Wildenhues.
Bruno Haible <bruno@clisp.org>
parents: 6679
diff changeset
1 # poll.m4 serial 6
6679
41b90d084576 (gl_FUNC_POLL): If we deem poll(2) unacceptable, use
Paul Eggert <eggert@cs.ucla.edu>
parents: 5989
diff changeset
2 dnl Copyright (c) 2003, 2005, 2006 Free Software Foundation, Inc.
5611
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4384
diff changeset
3 dnl This file is free software; the Free Software Foundation
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4384
diff changeset
4 dnl gives unlimited permission to copy and/or distribute it,
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
Paul Eggert <eggert@cs.ucla.edu>
parents: 4384
diff changeset
5 dnl with or without modifications, as long as this notice is preserved.
4242
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
6
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
7 AC_DEFUN([gl_FUNC_POLL],
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
8 [
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
9 AC_CHECK_HEADERS(poll.h)
4384
4bf5f9b5190a Make .h file creation more reliable.
Bruno Haible <bruno@clisp.org>
parents: 4242
diff changeset
10 if test "$ac_cv_header_poll_h" = no; then
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
11 gl_cv_func_poll=no
4384
4bf5f9b5190a Make .h file creation more reliable.
Bruno Haible <bruno@clisp.org>
parents: 4242
diff changeset
12 else
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
13 AC_CHECK_FUNC(poll,
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
14 [# Check whether poll() works on special files (like /dev/null) and
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
15 # and ttys (like /dev/tty). On MacOS X 10.4.0 and AIX 5.3, it doesn't.
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
16 AC_TRY_RUN([
5989
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
17 #include <fcntl.h>
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
18 #include <poll.h>
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
19 int main()
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
20 {
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
21 struct pollfd ufd;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
22 /* Try /dev/null for reading. */
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
23 ufd.fd = open ("/dev/null", O_RDONLY);
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
24 if (ufd.fd < 0)
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
25 /* If /dev/null does not exist, it's not MacOS X nor AIX. */
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
26 return 0;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
27 ufd.events = POLLIN;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
28 ufd.revents = 0;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
29 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
30 return 1;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
31 /* Try /dev/null for writing. */
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
32 ufd.fd = open ("/dev/null", O_WRONLY);
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
33 if (ufd.fd < 0)
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
34 /* If /dev/null does not exist, it's not MacOS X nor AIX. */
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
35 return 0;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
36 ufd.events = POLLOUT;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
37 ufd.revents = 0;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
38 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
39 return 1;
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
40 /* Trying /dev/tty may be too environment dependent. */
5989
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
41 return 0;
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
42 }],
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
43 [gl_cv_func_poll=yes],
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
44 [gl_cv_func_poll=no],
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
45 [# When cross-compiling, assume that poll() works everywhere except on
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
46 # MacOS X or AIX, regardless of its version.
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
47 AC_EGREP_CPP([MacOSX], [
6748
427cd89c6d7b AIX 5.3 also has a broken poll(), reported Ralf Wildenhues.
Bruno Haible <bruno@clisp.org>
parents: 6679
diff changeset
48 #if (defined(__APPLE__) && defined(__MACH__)) || defined(_AIX)
427cd89c6d7b AIX 5.3 also has a broken poll(), reported Ralf Wildenhues.
Bruno Haible <bruno@clisp.org>
parents: 6679
diff changeset
49 This is MacOSX or AIX
5989
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
50 #endif
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
51 ], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
52 fi
5989
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
53 if test $gl_cv_func_poll = yes; then
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
54 AC_DEFINE([HAVE_POLL], 1,
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
55 [Define to 1 if you have the 'poll' function and it works.])
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
56 POLL_H=
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
57 else
5989
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
58 AC_LIBOBJ(poll)
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
59 AC_DEFINE(poll, rpl_poll,
c0415917431f Don't use poll() on MacOS X 10.4.
Bruno Haible <bruno@clisp.org>
parents: 5611
diff changeset
60 [Define to poll if the replacement function should be used.])
4242
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
61 gl_PREREQ_POLL
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
62 POLL_H=poll.h
4242
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
63 fi
6749
912476e213eb Rearrange code.
Bruno Haible <bruno@clisp.org>
parents: 6748
diff changeset
64 AC_SUBST([POLL_H])
4242
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
65 ])
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
66
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
67 # Prerequisites of lib/poll.c.
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
68 AC_DEFUN([gl_PREREQ_POLL],
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
69 [
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
70 AC_REQUIRE([AC_HEADER_TIME])
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
71 AC_CHECK_HEADERS_ONCE(sys/time.h)
eec6ba9ed532 New module poll, from Paolo Bonzini <bonzini@gnu.org>.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
72 ])