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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
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<head>
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<title>luaposix 33.3.0 Reference</title>
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<link rel="stylesheet" href="../ldoc.css" type="text/css" />
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</head>
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<body>
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<big></big>
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luaposix 33.3.0
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Index
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Contents
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Functions
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Constants
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Modules
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posix
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posix.ctype
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posix.curses
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posix.dirent
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posix.errno
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posix.fcntl
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posix.fnmatch
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posix.getopt
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posix.glob
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posix.grp
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posix.libgen
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posix.poll
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posix.pwd
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posix.sched
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posix.signal
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posix.stdio
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posix.stdlib
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posix.sys.msg
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posix.sys.resource
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posix.sys.socket
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posix.sys.stat
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posix.sys.statvfs
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posix.sys.time
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posix.sys.times
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posix.sys.utsname
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posix.sys.wait
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posix.syslog
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posix.termio
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posix.time
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posix.unistd
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posix.utime
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Classes
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posix.curses.chstr
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posix.curses.window
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Examples
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curses.lua
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dir.lua
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fork.lua
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fork2.lua
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getopt.lua
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glob.lua
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limit.lua
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lock.lua
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netlink-uevent.lua
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ping.lua
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poll.lua
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rt_sched.lua
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signal.lua
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socket.lua
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termios.lua
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tree.lua
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Module posix.sys.msg
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Sys V Message Queue Operations.
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Where supported by the underlying system, functions to send and receive
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interprocess messages. If the module loads successfully, but there is
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no system support, then posix.sys.msg.version will be set, but the
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unsupported APIs wil be nil.
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msgget (key[, flags=0])
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Get a message queue identifier
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msgrcv (id, size, type[, flags=0])
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Receive message from a message queue
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msgsnd (id, type, message[, flags=0])
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Send message to a message queue
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posix.sys.msg
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Message constants.
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Functions
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msgget (key[, flags=0])
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Get a message queue identifier
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Parameters:
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key
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int
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message queue id, or IPC_PRIVATE for a new queue
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flags
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int
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bitwise OR of zero or more from IPC_CREAT and IPC_EXCL,
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and access permissions S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH
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and S_IWOTH (from posix.sys.stat)
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(default 0)
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Returns:
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int
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message queue identifier, if successful
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Or
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nil
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string
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error message
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int
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errnum
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See also:
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msgget(2)
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msgrcv (id, size, type[, flags=0])
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Receive message from a message queue
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Parameters:
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id
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int
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message queue identifier returned by msgget
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size
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int
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maximum message size
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type
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int
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message type (optional, default - 0)
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flags
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int
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bitwise OR of zero or more of IPC_NOWAIT, MSG_EXCEPT
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and MSG_NOERROR
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(default 0)
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Returns:
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int
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message type from msgsnd
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string
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message text, if successful
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Or
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nil
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string
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error message
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int
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errnum
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See also:
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msgrcv(2)
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msgsnd (id, type, message[, flags=0])
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Send message to a message queue
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Parameters:
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id
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int
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message queue identifier returned by msgget
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type
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int
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arbitrary message type
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message
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string
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content
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flags
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int
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optionally IPC_NOWAIT
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(default 0)
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Returns:
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int
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0, if successful
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Or
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nil
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string
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error message
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int
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errnum
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See also:
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msgsnd(2)
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Constants
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posix.sys.msg
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Message constants.
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Any constants not available in the underlying system will be nil valued.
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Fields:
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IPC_CREAT
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int
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create entry if key does not exist
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IPC_EXCL
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int
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fail if key exists
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IPC_PRIVATE
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int
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private key
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IPC_NOWAIT
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int
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error if request must wait
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MSG_EXCEPT
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int
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read messages with differing type
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MSG_NOERROR
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int
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truncate received message rather than erroring
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Usage:
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for name, value in pairs (require "posix.sys.msg") do
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if type (value) == "number" then
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print (name, value)
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end
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end
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generated by LDoc 1.4.3
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Last updated 2015-03-01 09:06:02
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</body>
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</html>
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