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signal.7: Add subsection on queuing and delivery semantics for standard signals 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2019-07-13 11:42:09 -06:00
parent ed386413f8
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@ -308,6 +308,16 @@ by default on those other UNIX systems where it appears.
(which is not specified in POSIX.1-2001) is ignored by default
on several other UNIX systems.
.\"
.SS Queueing and delivery semantics for standard signals
If multiple standard signals are pending for a process,
the order in which the signals are delivered is unspecified.
.PP
Standard signals do not queue.
If multiple instances of a standard signal are generated while
that signal is blocked,
then only one instance of the signal is marked as pending
(and the signal will be delivered just once when it is unblocked).
.\"
.SS Signal numbering for standard signals
The numeric value for each signal is given in the table below.
As shown in the table, many signals have different numeric values