mesg man page on HP-UX

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mesg(5)								       mesg(5)

NAME
       mesg - enable or disable System V IPC messages at boot time (OBSOLETE)

DESCRIPTION
       The  tunable is obsolete.  The System V IPC message subsystem is always
       enabled.

   Overview
       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 reserved kernel memory.  Messages equal to or
       smaller than 64 bytes are allocated with the message header and	there‐
       fore  do	 not  consume  extra  kernel structure to maintain the memory.
       Each message is "typed" with an application-specific number.  Each mes‐
       sage queue is referenced by a unique ID, and can contain multiple indi‐
       vidual 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
       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  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by AT&T.

SEE ALSO
       ipcrm(1),  ipcs(1),   msgctl(2),	  msgget(2),   msgrcv(2),   msgsnd(2),
       msgmnb(5), msgmni(5), msgmbs(5), msgtql(5).

OBSOLETE		   Tunable Kernel Parameters		       mesg(5)
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