-# poll.m4 serial 2
-dnl Copyright (c) 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License. As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of the program.
+# poll.m4 serial 14
+dnl Copyright (c) 2003, 2005-2007, 2009-2011 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_POLL],
[
- AC_CHECK_HEADERS(poll.h)
+ AC_REQUIRE([gl_POLL_H])
if test "$ac_cv_header_poll_h" = no; then
- POLL_H=poll.h
+ ac_cv_func_poll=no
+ gl_cv_func_poll=no
else
- POLL_H=
+ AC_CHECK_FUNC([poll],
+ [# Check whether poll() works on special files (like /dev/null) and
+ # and ttys (like /dev/tty). On MacOS X 10.4.0 and AIX 5.3, it doesn't.
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <fcntl.h>
+#include <poll.h>
+ int main()
+ {
+ int result = 0;
+ struct pollfd ufd;
+ /* Try /dev/null for reading. */
+ ufd.fd = open ("/dev/null", O_RDONLY);
+ /* If /dev/null does not exist, it's not MacOS X nor AIX. */
+ if (ufd.fd >= 0)
+ {
+ ufd.events = POLLIN;
+ ufd.revents = 0;
+ if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
+ result |= 1;
+ }
+ /* Try /dev/null for writing. */
+ ufd.fd = open ("/dev/null", O_WRONLY);
+ /* If /dev/null does not exist, it's not MacOS X nor AIX. */
+ if (ufd.fd >= 0)
+ {
+ ufd.events = POLLOUT;
+ ufd.revents = 0;
+ if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
+ result |= 2;
+ }
+ /* Trying /dev/tty may be too environment dependent. */
+ return result;
+ }]])],
+ [gl_cv_func_poll=yes],
+ [gl_cv_func_poll=no],
+ [# When cross-compiling, assume that poll() works everywhere except on
+ # MacOS X or AIX, regardless of its version.
+ AC_EGREP_CPP([MacOSX], [
+#if (defined(__APPLE__) && defined(__MACH__)) || defined(_AIX)
+This is MacOSX or AIX
+#endif
+], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
fi
- AC_SUBST([POLL_H])
-
- AC_REPLACE_FUNCS(poll)
- if test $ac_cv_func_poll = no; then
- gl_PREREQ_POLL
+ if test $gl_cv_func_poll != yes; then
+ AC_CHECK_FUNC([poll], [ac_cv_func_poll=yes], [ac_cv_func_poll=no])
+ if test $ac_cv_func_poll = no; then
+ HAVE_POLL=0
+ else
+ REPLACE_POLL=1
+ fi
+ fi
+ if test $HAVE_POLL = 0 || test $REPLACE_POLL = 1; then
+ :
+ else
+ AC_DEFINE([HAVE_POLL], [1],
+ [Define to 1 if you have the 'poll' function and it works.])
fi
])
# Prerequisites of lib/poll.c.
AC_DEFUN([gl_PREREQ_POLL],
[
- AC_REQUIRE([AC_HEADER_TIME])
- AC_CHECK_HEADERS_ONCE(sys/time.h)
+ AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/filio.h])
])