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The mesg tunable is obsolete.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
http://docs.hp.com.
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),
msgtql(5).
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: Sep 2004 [ Back ] |
