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
        
 0if timed out, number of fd's ready if successfulOr- nil
- string error message
- int errnum
 See also:
- rpoll (fd[, timeout=-1])
- 
    Wait for some event on a file descriptor.
Based on a lua-l list post.
    Parameters:- fd int file descriptor
- timeout
            int
         maximum timeout in milliseconds, or -1to block indefinitely (default -1)
 Returns:- 
           int
        
 0if timed out, number of fd's ready if successfulOr- nil
- error message
- int errnum
 See also:Usage:local stdio = require "posix.stdio" local fh = io.open "one" while true do local r = rpoll (stdio.fileno(fh), 500) if r == 0 then print 'timeout' elseif r == 1 then print (fh:read ()) else print "finish!" break end end