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From: Ngie Cooper <ngie@FreeBSD.org>
Date: Sat, 3 Sep 2016 00:47:55 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject: svn commit: r305314 -
 projects/netbsd-tests-update-12/contrib/netbsd-tests/lib/libc/sys
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Author: ngie
Date: Sat Sep  3 00:47:54 2016
New Revision: 305314
URL: https://svnweb.freebsd.org/changeset/base/305314

Log:
  Don't dedupe signals less than SIGRTMIN
  
  FreeBSD always delivers all signals sent with sigqueue, except when
  dealing with low memory conditions according to kib (see
  bug # 212173 comment # 5).
  
  In collaboration with:	kib
  PR:	212173
  Sponsored by:	EMC / Isilon Storage Division

Modified:
  projects/netbsd-tests-update-12/contrib/netbsd-tests/lib/libc/sys/t_sigqueue.c

Modified: projects/netbsd-tests-update-12/contrib/netbsd-tests/lib/libc/sys/t_sigqueue.c
==============================================================================
--- projects/netbsd-tests-update-12/contrib/netbsd-tests/lib/libc/sys/t_sigqueue.c	Sat Sep  3 00:27:41 2016	(r305313)
+++ projects/netbsd-tests-update-12/contrib/netbsd-tests/lib/libc/sys/t_sigqueue.c	Sat Sep  3 00:47:54 2016	(r305314)
@@ -151,6 +151,23 @@ sigorder(int *ordered, const int *tosend
 	if (len == 1)
 		return len;
 
+#ifdef __FreeBSD__
+	/*
+	 * Don't dedupe signal numbers (bug 212173)
+	 *
+	 * Per kib's comment..
+	 *
+	 * "
+	 * OTOH, FreeBSD behaviour is to treat all signals as realtime while
+	 * there is no mem shortage and siginfo can be allocated.  In
+	 * particular, signals < SIGRTMIN are not collapsed when queued more
+	 * than once.
+	 * "
+	 */
+
+	return len;
+#else
+
 	size_t i, j;
 	for (i = 0, j = 0; i < len - 1; i++) {
 		if (ordered[i] >= SIGRTMIN)
@@ -164,6 +181,7 @@ sigorder(int *ordered, const int *tosend
 		ordered[i + 1] = ordered[j];
 	}
 	return i + 1;
+#endif
 }
 
 ATF_TC(sigqueue_rt);