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