mirror of https://github.com/mkerrisk/man-pages
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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@ -336,14 +336,20 @@ and
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.B SIGNO
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Signal number to be used for
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.BR SIGEV_SIGNAL .
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.SS Polling message queue descriptors
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On Linux, a message queue descriptor is actually a file descriptor,
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and can be monitored using
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.SS Linux implementation of message queue descriptors
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On Linux, a message queue descriptor is actually a file descriptor.
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(POSIX does not require such an implementation.)
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This means that a message queue descriptor can be monitored using
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.BR select (2),
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.BR poll (2),
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or
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.BR epoll (7).
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This is not portable.
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The close-on-exec flag (see
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.BR open (2))
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is automatically set on the file descriptor returned by
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.BR mq_open (2).
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.SS IPC namespaces
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For a discussion of the interaction of System V IPC objects and
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IPC namespaces, see
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