From: Michael Hudson-Doyle <michael.hudson@canonical.com>
Date: Thu, 12 Nov 2015 19:55:44 +0000 (+1300)
Subject: runtime: ignore rt_sigaction error if it is for SIGRTMAX
X-Git-Tag: go1.6beta1~496
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d10675089d74db0408f2432eae3bd89a8e1c2d6a;p=gostls13.git

runtime: ignore rt_sigaction error if it is for SIGRTMAX

A forward port of https://codereview.appspot.com/124900043/ which somehow
got lost somewhere.

Fixes #13024

Change-Id: Iab128899e65c51d90f6704e3e1b2fc9326e3a1c2
Reviewed-on: https://go-review.googlesource.com/16853
Reviewed-by: Russ Cox <rsc@golang.org>
---

diff --git a/src/runtime/os1_linux.go b/src/runtime/os1_linux.go
index d59ca3915e..aa62faa0f1 100644
--- a/src/runtime/os1_linux.go
+++ b/src/runtime/os1_linux.go
@@ -293,7 +293,8 @@ func setsig(i int32, fn uintptr, restart bool) {
 		fn = funcPC(sigtramp)
 	}
 	sa.sa_handler = fn
-	if rt_sigaction(uintptr(i), &sa, nil, unsafe.Sizeof(sa.sa_mask)) != 0 {
+	// Qemu rejects rt_sigaction of SIGRTMAX (64).
+	if rt_sigaction(uintptr(i), &sa, nil, unsafe.Sizeof(sa.sa_mask)) != 0 && i != 64 {
 		throw("rt_sigaction failure")
 	}
 }