-# poll.m4 serial 5
-dnl Copyright (c) 2003, 2005, 2006 Free Software Foundation, Inc.
+# poll.m4 serial 17
+dnl Copyright (c) 2003, 2005-2007, 2009-2014 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)
- if test "$ac_cv_header_poll_h" = no; then
- POLL_H=poll.h
+ AC_REQUIRE([gl_POLL_H])
+ AC_REQUIRE([gl_SOCKETS])
+ if test $ac_cv_header_poll_h = no; then
+ ac_cv_func_poll=no
+ gl_cv_func_poll=no
else
- POLL_H=
- fi
- AC_SUBST([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, it doesn't.
- AC_TRY_RUN([
+ AC_CHECK_FUNC([poll],
+ [# Check whether poll() works on special files (like /dev/null) and
+ # and ttys (like /dev/tty). On Mac OS 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()
- {
- 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. */
- return 0;
- ufd.events = POLLIN;
- ufd.revents = 0;
- if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
- return 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. */
- return 0;
- ufd.events = POLLOUT;
- ufd.revents = 0;
- if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
- return 1;
- /* Trying /dev/tty may be too environment dependent. */
- return 0;
- }],
- [gl_cv_func_poll=yes],
- [gl_cv_func_poll=no],
- [# When cross-compiling, assume that poll() works everywhere except on
- # MacOS X, regardless of its version.
- AC_EGREP_CPP([MacOSX], [
-#if defined(__APPLE__) && defined(__MACH__)
-This is MacOSX
+ 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 Mac OS 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 Mac OS 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
+ # Mac OS 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])])])
- if test $gl_cv_func_poll = yes; then
- AC_DEFINE([HAVE_POLL], 1,
+ fi
+ 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
- if test $gl_cv_func_poll = no; then
- POLL_H=poll.h # Avoid differing declaration from a system header.
- AC_LIBOBJ(poll)
- AC_DEFINE(poll, rpl_poll,
- [Define to poll if the replacement function should be used.])
- gl_PREREQ_POLL
+ dnl Determine the needed libraries.
+ LIB_POLL="$LIBSOCKET"
+ if test $HAVE_POLL = 0 || test $REPLACE_POLL = 1; then
+ case "$host_os" in
+ mingw*)
+ dnl On the MSVC platform, the function MsgWaitForMultipleObjects
+ dnl (used in lib/poll.c) requires linking with -luser32. On mingw,
+ dnl it is implicit.
+ AC_LINK_IFELSE(
+ [AC_LANG_SOURCE([[
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+int
+main ()
+{
+ MsgWaitForMultipleObjects (0, NULL, 0, 0, 0);
+ return 0;
+}]])],
+ [],
+ [LIB_POLL="$LIB_POLL -luser32"])
+ ;;
+ esac
fi
+ AC_SUBST([LIB_POLL])
])
# 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])
])
projects / gnulib.git / blobdiff