Module posix.poll

Synchronous I/O Multiplexing.

Examine file descriptors for events, such as readyness for I/O.

Functions

poll (fds[, timeout=-1]) Wait for events on multiple file descriptors.
rpoll (fd[, timeout=-1]) Wait for some event on a file descriptor.


Functions

poll (fds[, timeout=-1])
Wait for events on multiple file descriptors.

Parameters:

  • fds table list of file descriptors
  • timeout int maximum timeout in milliseconds, or -1 to block indefinitely (default -1)

Returns:

    int 0 if timed out, 1 if fd is ready

Or

  1. nil
  2. string error message
  3. int errnum

See also:

rpoll (fd[, timeout=-1])
Wait for some event on a file descriptor. Based on http://lua-users.org/lists/lua-l/2007-11/msg00346.html.

Parameters:

  • fd int file descriptor
  • timeout int maximum timeout in milliseconds, or -1 to block indefinitely (default -1)

Returns:

    int 0 if timed out, 1 if fd is ready

Or

  1. nil
  2. error message
  3. int errnum

See also:

Usage:

    fh = io.open "one"
    while true do
      r = rpoll (fh, 500)
      if r == 0 then
        print 'timeout'
      elseif r == 1 then
        print (fh:read ())
      else
        print "finish!"
        break
      end
    end
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