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 mesg(5)                                                             mesg(5)
                          Tunable Kernel Parameters

 NAME    [Toc]    [Back]
      mesg - enable or disable System V IPC messages at boot time

 DESCRIPTION    [Toc]    [Back]
      The mesg tunable is obsolete.  The System V IPC message subsystem is
      always enabled.

    Overview    [Toc]    [Back]
      A System V message is just a sequence of bytes that can be passed
      between cooperating processes via a message queue.  Messages can be of
      any length up to a tunable maximum.  Messages larger than 64 bytes
      (not tunable) are stored in one or more contiguous "segments" of
      reserved kernel memory and are managed through the message segment
      map.  Messages equal to or smaller than 64 bytes are allocated with
      the message header and therefore do not consume a segment.  Each
      message is "typed" with an application-specific number.  Each message
      queue is referenced by a unique ID, and can contain multiple
      individual messages.

      The process receiving a message can get the "first" message (FIFO),
      the first of a specified type, the first of a group of types, or wait
      for a specific type to appear.

 WARNINGS    [Toc]    [Back]
      Installation of optional kernel software, from HP or other vendors,
      may cause changes to tunable parameter values.  After installation,
      some tunable parameters may no longer be at the default or recommended
      values.  For information about the effects of installation on tunable
      values, consult the documentation for the kernel software being
      installed. For information about optional kernel software that was
      factory installed on your system, see HP-UX Release Notes at

 AUTHOR    [Toc]    [Back]
      mesg was developed by AT&T.

 SEE ALSO    [Toc]    [Back]
      ipcrm(1), ipcs(1), msgctl(2), msgget(2), msgrcv(2), msgsnd(2),
      msgmap(5), msgmax(5), msgmnb(5), msgmni(5), msgseg(5), msgssz(5),

 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004
[ Back ]
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