shithub: npe

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sigaction: do not crash

--- a/libnpe/sigaction.c

+++ b/libnpe/sigaction.c

@@ -4,8 +4,19 @@

 /* FIXME this only supports a single handler */

 static sa_handler last;

-sa_handler SIG_DFL = (void*)1, SIG_IGN = nil;

+static void

+_SIG_DFL(int)

+{

+}

+

+static void

+_SIG_IGN(int)

+{

+}

+

+sa_handler SIG_DFL = _SIG_DFL, SIG_IGN = _SIG_IGN;

+

 static int

 handler(void*, char *s)

 {

@@ -12,7 +23,8 @@

 	/* kill is kill */

 	if(strcmp(s, "kill") != 0 && strcmp(s, "threadint") != 0){

 		fprint(2, "%s: %s\n", threadgetname(), s);

-		last(SIGSEGV);

+		if(last != nil)

+			last(SIGTERM);

 	}

 	return 0;

 }

@@ -20,7 +32,7 @@

 void

 sigaction(int, struct sigaction *act, struct sigaction *)

 {

-	if(act != nil && last == nil){

+	if(act != nil && act->sa_handler != nil && last == nil){

 		last = act->sa_handler;

 		atnotify(handler, 1);

 	}else if(act == nil){