ac_sys_dev_poll

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.

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.

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]
    )
  )
])

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