luaposix 36.2.1

• Index

Contents

• Functions

Modules

• posix
• posix.ctype
• posix.dirent
• posix.errno
• posix.fcntl
• posix.fnmatch
• posix.glob
• posix.grp
• posix.libgen
• posix.poll
• posix.pwd
• posix.sched
• posix.signal
• posix.stdio
• posix.stdlib
• posix.sys.msg
• posix.sys.resource
• posix.sys.socket
• posix.sys.stat
• posix.sys.statvfs
• posix.sys.time
• posix.sys.times
• posix.sys.utsname
• posix.sys.wait
• posix.syslog
• posix.termio
• posix.time
• posix.unistd
• posix.utime

Examples

• abstract-ns-client.lua
• abstract-ns-server.lua
• dir.lua
• dup2.lua
• fork.lua
• fork2.lua
• getopt.lua
• glob.lua
• limit.lua
• lock.lua
• netlink-uevent.lua
• packet-socket.lua
• ping.lua
• poll.lua
• rt_sched.lua
• signal.lua
• socket.lua
• termios.lua
• tree.lua

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, number of fd's ready if successful

Or

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

See also:

• poll(2)
• rpoll
• poll.lua

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 -1 to block indefinitely (default -1)

Returns:

int 0 if timed out, number of fd's ready if successful

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