Macro: ac_sys_dev_poll

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Synopsis

  `AC_SYS_DEV_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])`

Version

  1.1 (2001/07/26) Miscellaneous @ ac-archive-0.5.39

Author

  Dave Benson <daveb@ffem.org>

Description

  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.

M4 Source Code

      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]
          )
        )
      ])