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mq_overview.7: Note that the close-on-exec flag is automatically set on MQ descriptors 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-02-06 15:19:39 +01:00
parent 6b1e34f2a4
commit 785008cd99
1 changed files with 9 additions and 3 deletions
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man7/mq_overview.7
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@ -336,14 +336,20 @@ and
.B SIGNO .B SIGNO
Signal number to be used for Signal number to be used for
.BR SIGEV_SIGNAL . .BR SIGEV_SIGNAL .
.SS Polling message queue descriptors .SS Linux implementation of message queue descriptors
On Linux, a message queue descriptor is actually a file descriptor, On Linux, a message queue descriptor is actually a file descriptor.
and can be monitored using (POSIX does not require such an implementation.)
This means that a message queue descriptor can be monitored using
.BR select (2), .BR select (2),
.BR poll (2), .BR poll (2),
or or
.BR epoll (7). .BR epoll (7).
This is not portable. This is not portable.
The close-on-exec flag (see
.BR open (2))
is automatically set on the file descriptor returned by
.BR mq_open (2).
.SS IPC namespaces .SS IPC namespaces
For a discussion of the interaction of System V IPC objects and For a discussion of the interaction of System V IPC objects and
IPC namespaces, see IPC namespaces, see