mesg(5)mesg(5)NAMEmesg - 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The tunable is obsolete.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 ALSOipcrm(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)