-# poll.m4 serial 7
-dnl Copyright (c) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
+# poll.m4 serial 13
+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
+ ac_cv_func_poll=no
gl_cv_func_poll=no
else
- AC_CHECK_FUNC(poll,
+ 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_TRY_RUN([
+ 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 (ufd.fd < 0)
- /* If /dev/null does not exist, it's not MacOS X nor AIX. */
- return 0;
- ufd.events = POLLIN;
- ufd.revents = 0;
- if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
- return 1;
+ /* 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 (ufd.fd < 0)
- /* If /dev/null does not exist, it's not MacOS X nor AIX. */
- return 0;
- ufd.events = POLLOUT;
- ufd.revents = 0;
- if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
- return 1;
+ /* 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 0;
- }],
+ return result;
+ }]])],
[gl_cv_func_poll=yes],
[gl_cv_func_poll=no],
[# When cross-compiling, assume that poll() works everywhere except on
#endif
], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
fi
- if test $gl_cv_func_poll = yes; then
- AC_DEFINE([HAVE_POLL], 1,
- [Define to 1 if you have the 'poll' function and it works.])
- POLL_H=
- else
- AC_LIBOBJ(poll)
- AC_DEFINE(poll, rpl_poll,
- [Define to poll if the replacement function should be used.])
+ 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
+ AC_LIBOBJ([poll])
gl_PREREQ_POLL
- POLL_H=poll.h
+ else
+ AC_DEFINE([HAVE_POLL], [1],
+ [Define to 1 if you have the 'poll' function and it works.])
fi
- AC_SUBST([POLL_H])
])
# Prerequisites of lib/poll.c.
AC_DEFUN([gl_PREREQ_POLL],
[
- AC_CHECK_HEADERS_ONCE(sys/ioctl.h sys/filio.h)
+ AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/filio.h])
])