Only catch all signals if os/signal package imported.

Fixes #776.

R=rsc
CC=golang-dev
https://golang.org/cl/1745041

src/pkg/runtime/darwin/386/signal.c

@@ -129,7 +129,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	int32 i;
 	static Sigaction sa;
@@ -141,6 +141,8 @@ initsig(void)
 	sa.sa_tramp = sigtramp;	// sigtramp's job is to call into real handler
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue)) {
 				sa.__sigaction_u.__sa_sigaction = sighandler;
 			} else {

src/pkg/runtime/darwin/amd64/signal.c

@@ -138,7 +138,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	int32 i;
 	static Sigaction sa;
@@ -150,6 +150,8 @@ initsig(void)
 	sa.sa_tramp = sigtramp;	// sigtramp's job is to call into real handler
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue)) {
 				sa.__sigaction_u.__sa_sigaction = sighandler;
 			} else {

src/pkg/runtime/freebsd/386/signal.c

@@ -124,7 +124,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	static Sigaction sa;
 
@@ -136,6 +136,8 @@ initsig(void)
 	
 	for(i = 0; i < NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.__sigaction_u.__sa_sigaction = (void*) sigtramp;
 			else

src/pkg/runtime/freebsd/amd64/signal.c

@@ -132,7 +132,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	static Sigaction sa;
 
@@ -144,6 +144,8 @@ initsig(void)
 	
 	for(i = 0; i < NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.__sigaction_u.__sa_sigaction = (void*) sigtramp;
 			else

src/pkg/runtime/linux/386/signal.c

@@ -116,7 +116,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	static Sigaction sa;
 
@@ -128,6 +128,8 @@ initsig(void)
 	sa.sa_restorer = (void*)sigreturn;
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.k_sa_handler = (void*)sigtramp;
 			else

src/pkg/runtime/linux/amd64/signal.c

@@ -126,7 +126,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	static Sigaction sa;
 
@@ -138,6 +138,8 @@ initsig(void)
 	sa.sa_restorer = (void*)sigreturn;
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.sa_handler = (void*)sigtramp;
 			else

src/pkg/runtime/linux/arm/signal.c

@@ -120,7 +120,7 @@ signalstack(byte *p, int32 n)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 	static Sigaction sa;
 
@@ -133,6 +133,8 @@ initsig(void)
 	sa.sa_restorer = (void*)sigreturn;
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
+			if((sigtab[i].flags & SigQueue) != queue)
+				continue;
 			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.sa_handler = (void*)sigtramp;
 			else

src/pkg/runtime/nacl/386/signal.c

@@ -8,7 +8,7 @@
 #include "os.h"
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 }
 

src/pkg/runtime/runtime.c

@@ -278,7 +278,7 @@ check(void)
 	if(z != 4)
 		throw("cas4");
 
-	initsig();
+	initsig(0);
 }
 
 /*

src/pkg/runtime/runtime.h

@@ -389,7 +389,7 @@ String	catstring(String, String);
 String	gostring(byte*);
 String	gostringnocopy(byte*);
 String	gostringw(uint16*);
-void	initsig(void);
+void	initsig(int32);
 int32	gotraceback(void);
 void	traceback(uint8 *pc, uint8 *sp, uint8 *lr, G* gp);
 void	tracebackothers(G*);

src/pkg/runtime/sigqueue.goc

@@ -94,5 +94,6 @@ func Signame(sig int32) (name String) {
 }
 
 func Siginit() {
+	initsig(SigQueue);
 	sig.inuse = true;	// enable reception of signals; cannot disable
 }

src/pkg/runtime/tiny/thread.c

@@ -17,7 +17,7 @@ osinit(void)
 }
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 }
 

src/pkg/runtime/windows/386/signal.c

@@ -3,6 +3,6 @@
 // license that can be found in the LICENSE file.
 
 void
-initsig(void)
+initsig(int32 queue)
 {
 }