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Autoconf Macro: ac_sys_dev_poll
</title>
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<h1>
ac_sys_dev_poll
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_SYS_DEV_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This macro tests for the presence of /dev/poll support in the build
environment. It checks that the needed structure (dvpoll) is available,
with the standard fields. /dev/poll is most often seen under Solaris.
</p>
<p>
Note that it does not attempt to actually open /dev/poll -- you should test
for errors when you open it and then fall back to poll() if it is
unavailable.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Dave Benson <daveb@ffem.org>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2003-10-29
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_SYS_DEV_POLL], [AC_CACHE_CHECK(for /dev/poll support, ac_cv_dev_poll,
AC_TRY_COMPILE([#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/devpoll.h>],
[
struct dvpoll p;
p.dp_timeout = 0;
p.dp_nfds = 0;
p.dp_fds = (struct pollfd *) 0;
return 0;
],
ac_cv_dev_poll=yes
[$1],
ac_cv_dev_poll=no
[$2]
)
)
])
</pre>
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