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Document SIGEV_NONE and SIGEV_SIGNAL.

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This commit is contained in:
David Xu 2005-12-05 04:44:39 +00:00
parent 052ea11c71
commit 8c1e5ef215
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=153101
1 changed files with 15 additions and 0 deletions
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15
lib/libc/sys/mq_notify.2
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@ -56,6 +56,21 @@ If the calling process or any other process has already
registered for notification of message arrival at the specified message
queue, subsequent attempts to register for that message queue will fail.
.Pp
The
.Fa notification
argument points to a
.Vt sigevent
structure that defines how the calling process will be notified.
If notification->sigev_notify is
.Dv SIGEV_NONE ,
then no signal will be posted, but the error status and the return status
for the operation will be set appropriately.
If notification->sigev_notify is SIGEV_SIGNAL, then the signal specified
in notification->sigev_signo will be sent to the process.
The signal will be queued to the process and the value specified in
notification->sigev_value will be the si_value component of the generated
signal.
.Pp
If
.Fa notification
is