This is patch

[ 559250 ] more POSIX signal stuff

Adds support (and docs and tests and autoconfery) for posix signal
mask handling -- sigpending, sigprocmask and sigsuspend.
diff --git a/Misc/NEWS b/Misc/NEWS
index f544af4..85da0d3 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -106,6 +106,9 @@
   of sizeof(int)!=sizeof(long)!=sizeof(void*) is delayed until dl.open
   is called.
 
+- signal.sigpending, signal.sigprocmask and signal.sigsuspend have
+  been added where available.
+
 Library
 
 - added degree/radian conversion functions to the math module.