os/signal: new package

Fixes #71.

R=rsc, r
https://golang.org/cl/162056

4 files changed, 61 insertions, 23 deletions

diff --git a/src/pkg/runtime/linux/386/signal.c b/src/pkg/runtime/linux/386/signal.c
index 90685d8799..2e6c7a5ff0 100644
--- a/src/pkg/runtime/linux/386/signal.c
+++ b/src/pkg/runtime/linux/386/signal.c
@@ -33,12 +33,25 @@ extern void sigtramp(void);
 extern void sigignore(void);	// just returns
 extern void sigreturn(void);	// calls sigreturn
 
+String
+signame(int32 sig)
+{
+	if(sig < 0 || sig >= NSIG)
+		return emptystring;
+	return gostring((byte*)sigtab[sig].name);
+}
+
 void
 sighandler(int32 sig, Siginfo* info, void* context)
 {
 	Ucontext *uc;
 	Sigcontext *sc;
 
+	if(sigtab[sig].flags & SigQueue) {
+		sigsend(sig);
+		return;
+	}
+
 	if(panicking)	// traceback already printed
 		exit(2);
 	panicking = 1;
@@ -81,13 +94,15 @@ initsig(void)
 {
 	static Sigaction sa;
 
+	siginit();
+
 	int32 i;
 	sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
 	sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL;
 	sa.sa_restorer = (void*)sigreturn;
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
-			if(sigtab[i].flags & SigCatch)
+			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.k_sa_handler = (void*)sigtramp;
 			else
 				sa.k_sa_handler = (void*)sigignore;
@@ -99,4 +114,3 @@ initsig(void)
 		}
 	}
 }
-
diff --git a/src/pkg/runtime/linux/amd64/signal.c b/src/pkg/runtime/linux/amd64/signal.c
index 55215176de..693b8c7042 100644
--- a/src/pkg/runtime/linux/amd64/signal.c
+++ b/src/pkg/runtime/linux/amd64/signal.c
@@ -41,6 +41,14 @@ extern void sigtramp(void);
 extern void sigignore(void);	// just returns
 extern void sigreturn(void);	// calls sigreturn
 
+String
+signame(int32 sig)
+{
+	if(sig < 0 || sig >= NSIG)
+		return emptystring;
+	return gostring((byte*)sigtab[sig].name);
+}
+
 void
 sighandler(int32 sig, Siginfo* info, void* context)
 {
@@ -48,6 +56,11 @@ sighandler(int32 sig, Siginfo* info, void* context)
 	Mcontext *mc;
 	Sigcontext *sc;
 
+	if(sigtab[sig].flags & SigQueue) {
+		sigsend(sig);
+		return;
+	}
+
 	if(panicking)	// traceback already printed
 		exit(2);
 	panicking = 1;
@@ -91,13 +104,15 @@ initsig(void)
 {
 	static Sigaction sa;
 
+	siginit();
+
 	int32 i;
 	sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
 	sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL;
 	sa.sa_restorer = (void*)sigreturn;
 	for(i = 0; i<NSIG; i++) {
 		if(sigtab[i].flags) {
-			if(sigtab[i].flags & SigCatch)
+			if(sigtab[i].flags & (SigCatch | SigQueue))
 				sa.sa_handler = (void*)sigtramp;
 			else
 				sa.sa_handler = (void*)sigignore;
@@ -109,4 +124,3 @@ initsig(void)
 		}
 	}
 }
-
diff --git a/src/pkg/runtime/linux/arm/signal.c b/src/pkg/runtime/linux/arm/signal.c
index f14dcbf912..2400575481 100644
--- a/src/pkg/runtime/linux/arm/signal.c
+++ b/src/pkg/runtime/linux/arm/signal.c
@@ -35,6 +35,14 @@ extern void sigtramp(void);
 extern void sigignore(void);	// just returns
 extern void sigreturn(void);	// calls sigreturn
 
+String
+signame(int32 sig)
+{
+	if(sig < 0 || sig >= NSIG)
+		return emptystring;
+	return gostring((byte*)sigtab[sig].name);
+}
+
 void sighandler(void) {}
 // void
 // sighandler(int32 sig, Siginfo* info, void* context)
diff --git a/src/pkg/runtime/linux/signals.h b/src/pkg/runtime/linux/signals.h
index 8f1112b991..883ac4e04a 100644
--- a/src/pkg/runtime/linux/signals.h
+++ b/src/pkg/runtime/linux/signals.h
@@ -5,11 +5,12 @@
 #define C SigCatch
 #define I SigIgnore
 #define R SigRestart
+#define Q SigQueue
 
 static SigTab sigtab[] = {
 	/* 0 */	0, "SIGNONE: no trap",
-	/* 1 */	0, "SIGHUP: terminal line hangup",
-	/* 2 */	0, "SIGINT: interrupt",
+	/* 1 */	Q+R, "SIGHUP: terminal line hangup",
+	/* 2 */	Q+R, "SIGINT: interrupt",
 	/* 3 */	C, "SIGQUIT: quit",
 	/* 4 */	C, "SIGILL: illegal instruction",
 	/* 5 */	C, "SIGTRAP: trace trap",
@@ -17,31 +18,32 @@ static SigTab sigtab[] = {
 	/* 7 */	C, "SIGBUS: bus error",
 	/* 8 */	C, "SIGFPE: floating-point exception",
 	/* 9 */	0, "SIGKILL: kill",
-	/* 10 */	0, "SIGUSR1: user-defined signal 1",
+	/* 10 */	Q+R, "SIGUSR1: user-defined signal 1",
 	/* 11 */	C, "SIGSEGV: segmentation violation",
-	/* 12 */	0, "SIGUSR2: user-defined signal 2",
+	/* 12 */	Q+R, "SIGUSR2: user-defined signal 2",
 	/* 13 */	I, "SIGPIPE: write to broken pipe",
-	/* 14 */	0, "SIGALRM: alarm clock",
-	/* 15 */	0, "SIGTERM: termination",
-	/* 16 */	0, "SIGSTKFLT: stack fault",
-	/* 17 */	I+R, "SIGCHLD: child status has changed",
+	/* 14 */	Q+R, "SIGALRM: alarm clock",
+	/* 15 */	Q+R, "SIGTERM: termination",
+	/* 16 */	Q+R, "SIGSTKFLT: stack fault",
+	/* 17 */	Q+R, "SIGCHLD: child status has changed",
 	/* 18 */	0, "SIGCONT: continue",
 	/* 19 */	0, "SIGSTOP: stop, unblockable",
-	/* 20 */	0, "SIGTSTP: keyboard stop",
-	/* 21 */	0, "SIGTTIN: background read from tty",
-	/* 22 */	0, "SIGTTOU: background write to tty",
-	/* 23 */	0, "SIGURG: urgent condition on socket",
-	/* 24 */	0, "SIGXCPU: cpu limit exceeded",
-	/* 25 */	0, "SIGXFSZ: file size limit exceeded",
-	/* 26 */	0, "SIGVTALRM: virtual alarm clock",
-	/* 27 */	0, "SIGPROF: profiling alarm clock",
-	/* 28 */	I+R, "SIGWINCH: window size change",
-	/* 29 */	0, "SIGIO: i/o now possible",
-	/* 30 */	0, "SIGPWR: power failure restart",
+	/* 20 */	Q+R, "SIGTSTP: keyboard stop",
+	/* 21 */	Q+R, "SIGTTIN: background read from tty",
+	/* 22 */	Q+R, "SIGTTOU: background write to tty",
+	/* 23 */	Q+R, "SIGURG: urgent condition on socket",
+	/* 24 */	Q+R, "SIGXCPU: cpu limit exceeded",
+	/* 25 */	Q+R, "SIGXFSZ: file size limit exceeded",
+	/* 26 */	Q+R, "SIGVTALRM: virtual alarm clock",
+	/* 27 */	Q+R, "SIGPROF: profiling alarm clock",
+	/* 28 */	Q+R, "SIGWINCH: window size change",
+	/* 29 */	Q+R, "SIGIO: i/o now possible",
+	/* 30 */	Q+R, "SIGPWR: power failure restart",
 	/* 31 */	C, "SIGSYS: bad system call",
 };
 #undef C
 #undef I
 #undef R
+#undef Q
 
 #define	NSIG 32