-# poll.m4 serial 9
-dnl Copyright (c) 2003, 2005, 2006, 2007, 2009, 2010 Free Software Foundation,
-dnl Inc.
+# 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
+ ac_cv_func_poll=no
gl_cv_func_poll=no
else
AC_CHECK_FUNC([poll],
#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],
#endif
], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
fi
- if test $gl_cv_func_poll = yes; then
+ 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.])
- POLL_H=
- else
- AC_LIBOBJ([poll])
- AC_DEFINE([poll], [rpl_poll],
- [Define to poll if the replacement function should be used.])
- gl_PREREQ_POLL
- POLL_H=poll.h
fi
- AC_SUBST([POLL_H])
])
# Prerequisites of lib/poll.c.