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signal.7: Note when Linux added realtime signals 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2015-02-18 20:48:44 +01:00
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@ -344,6 +344,7 @@ is synonymous with
.B SIGSYS
on most architectures.
.SS Real-time signals
Starting with version 2.2,
Linux supports real-time signals as originally defined in the POSIX.1b
real-time extensions (and now included in POSIX.1-2001).
The range of supported real-time signals is defined by the macros