runtime: don't always unblock all signals on dragonfly, freebsd and openbsd

https://golang.org/cl/10173 intrduced msigsave, ensureSigM and
_SigUnblock but didn't enable the new signal save/restore mechanism for
SIG{HUP,INT,QUIT,ABRT,TERM} on DragonFly BSD, FreeBSD and OpenBSD.

At present, it looks like they have the implementation. This change
enables the new mechanism on DragonFly BSD, FreeBSD and OpenBSD the same
as Darwin, NetBSD.

Change-Id: Ifb4b4743b3b4f50bfcdc7cf1fe1b59c377fa2a41
Reviewed-on: https://go-review.googlesource.com/18657
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

misc/cgo/test/cgo_linux_test.go

@@ -10,4 +10,3 @@ func TestSetgid(t *testing.T)      { testSetgid(t) }
 func Test6997(t *testing.T)    { test6997(t) }
 func TestBuildID(t *testing.T) { testBuildID(t) }
 func Test9400(t *testing.T)    { test9400(t) }
-func TestSigProcMask(t *testing.T) { testSigProcMask(t) }

misc/cgo/test/cgo_unix_test.go

@@ -9,3 +9,4 @@ package cgotest
 import "testing"
 
 func TestSigaltstack(t *testing.T) { testSigaltstack(t) }
+func TestSigprocmask(t *testing.T) { testSigprocmask(t) }

misc/cgo/test/sigprocmask_linux.c → misc/cgo/test/sigprocmask.c

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !windows
+
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>

misc/cgo/test/sigprocmask_linux.go → misc/cgo/test/sigprocmask.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !windows
+
 package cgotest
 
 /*
@@ -28,7 +30,7 @@ func IntoGoAndBack() {
 	blocked = C.CheckBlocked() != 0
 }
 
-func testSigProcMask(t *testing.T) {
+func testSigprocmask(t *testing.T) {
 	if r := C.RunSigThread(); r != 0 {
 		t.Error("pthread_create/pthread_join failed")
 	}

src/runtime/signal_dragonfly.go

@@ -14,14 +14,14 @@ var sigtable = [...]sigTabT{
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
 	/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
 	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
-	/* 4 */ {_SigThrow, "SIGILL: illegal instruction"},
-	/* 5 */ {_SigThrow, "SIGTRAP: trace trap"},
+	/* 4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
+	/* 5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
 	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
 	/* 7 */ {_SigThrow, "SIGEMT: emulate instruction executed"},
-	/* 8 */ {_SigPanic, "SIGFPE: floating-point exception"},
+	/* 8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
 	/* 9 */ {0, "SIGKILL: kill"},
-	/* 10 */ {_SigPanic, "SIGBUS: bus error"},
-	/* 11 */ {_SigPanic, "SIGSEGV: segmentation violation"},
+	/* 10 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
+	/* 11 */ {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},
 	/* 12 */ {_SigThrow, "SIGSYS: bad system call"},
 	/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
 	/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
@@ -30,14 +30,14 @@ var sigtable = [...]sigTabT{
 	/* 17 */ {0, "SIGSTOP: stop"},
 	/* 18 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
 	/* 19 */ {_SigNotify + _SigDefault, "SIGCONT: continue after stop"},
-	/* 20 */ {_SigNotify, "SIGCHLD: child status has changed"},
+	/* 20 */ {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},
 	/* 21 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
 	/* 22 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
 	/* 23 */ {_SigNotify, "SIGIO: i/o now possible"},
 	/* 24 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
 	/* 25 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
 	/* 26 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
-	/* 27 */ {_SigNotify, "SIGPROF: profiling alarm clock"},
+	/* 27 */ {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},
 	/* 28 */ {_SigNotify, "SIGWINCH: window size change"},
 	/* 29 */ {_SigNotify, "SIGINFO: status request from keyboard"},
 	/* 30 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},

src/runtime/signal_freebsd.go

@@ -16,14 +16,14 @@ var sigtable = [...]sigTabT{
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
 	/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
 	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
-	/* 4 */ {_SigThrow, "SIGILL: illegal instruction"},
-	/* 5 */ {_SigThrow, "SIGTRAP: trace trap"},
+	/* 4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
+	/* 5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
 	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
 	/* 7 */ {_SigThrow, "SIGEMT: emulate instruction executed"},
-	/* 8 */ {_SigPanic, "SIGFPE: floating-point exception"},
+	/* 8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
 	/* 9 */ {0, "SIGKILL: kill"},
-	/* 10 */ {_SigPanic, "SIGBUS: bus error"},
-	/* 11 */ {_SigPanic, "SIGSEGV: segmentation violation"},
+	/* 10 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
+	/* 11 */ {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},
 	/* 12 */ {_SigNotify, "SIGSYS: bad system call"},
 	/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
 	/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
@@ -32,14 +32,14 @@ var sigtable = [...]sigTabT{
 	/* 17 */ {0, "SIGSTOP: stop"},
 	/* 18 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
 	/* 19 */ {_SigNotify + _SigDefault, "SIGCONT: continue after stop"},
-	/* 20 */ {_SigNotify, "SIGCHLD: child status has changed"},
+	/* 20 */ {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},
 	/* 21 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
 	/* 22 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
 	/* 23 */ {_SigNotify, "SIGIO: i/o now possible"},
 	/* 24 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
 	/* 25 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
 	/* 26 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
-	/* 27 */ {_SigNotify, "SIGPROF: profiling alarm clock"},
+	/* 27 */ {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},
 	/* 28 */ {_SigNotify, "SIGWINCH: window size change"},
 	/* 29 */ {_SigNotify, "SIGINFO: status request from keyboard"},
 	/* 30 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},

src/runtime/signal_openbsd.go

@@ -16,14 +16,14 @@ var sigtable = [...]sigTabT{
 	/*  1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
 	/*  2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
 	/*  3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
-	/*  4 */ {_SigThrow, "SIGILL: illegal instruction"},
-	/*  5 */ {_SigThrow, "SIGTRAP: trace trap"},
+	/*  4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
+	/*  5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
 	/*  6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
 	/*  7 */ {_SigThrow, "SIGEMT: emulate instruction executed"},
-	/*  8 */ {_SigPanic, "SIGFPE: floating-point exception"},
+	/*  8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
 	/*  9 */ {0, "SIGKILL: kill"},
-	/* 10 */ {_SigPanic, "SIGBUS: bus error"},
-	/* 11 */ {_SigPanic, "SIGSEGV: segmentation violation"},
+	/* 10 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
+	/* 11 */ {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},
 	/* 12 */ {_SigThrow, "SIGSYS: bad system call"},
 	/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
 	/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
@@ -32,14 +32,14 @@ var sigtable = [...]sigTabT{
 	/* 17 */ {0, "SIGSTOP: stop"},
 	/* 18 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
 	/* 19 */ {_SigNotify + _SigDefault, "SIGCONT: continue after stop"},
-	/* 20 */ {_SigNotify, "SIGCHLD: child status has changed"},
+	/* 20 */ {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},
 	/* 21 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
 	/* 22 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
 	/* 23 */ {_SigNotify, "SIGIO: i/o now possible"},
 	/* 24 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
 	/* 25 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
 	/* 26 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
-	/* 27 */ {_SigNotify, "SIGPROF: profiling alarm clock"},
+	/* 27 */ {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},
 	/* 28 */ {_SigNotify, "SIGWINCH: window size change"},
 	/* 29 */ {_SigNotify, "SIGINFO: status request from keyboard"},
 	/* 30 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},