Various additions and fixes.

src/lib9/notify.c

@@ -0,0 +1,83 @@
+#include <signal.h>
+
+#include <u.h>
+#define NOPLAN9DEFINES
+#include <libc.h>
+#include "9proc.h"
+
+extern char *_p9sigstr(int, char*);
+
+static int sigs[] = {
+	SIGHUP,
+	SIGINT,
+	SIGQUIT,
+	SIGILL,
+	SIGTRAP,
+	SIGABRT,
+	SIGEMT,
+	SIGFPE,
+	SIGBUS,
+	SIGSEGV,
+	SIGSYS,
+	SIGPIPE,
+	SIGALRM,
+	SIGTERM,
+	SIGTSTP,
+	SIGTTIN,
+	SIGTTOU,
+	SIGXCPU,
+	SIGXFSZ,
+	SIGVTALRM,
+	SIGUSR1,
+	SIGUSR2,
+};
+
+static void (*notifyf)(void*, char*);
+
+static void
+notifysigf(int sig)
+{
+	int v;
+	char tmp[64];
+	Uproc *up;
+
+	up = _p9uproc();
+	v = p9setjmp(up->notejb);
+	if(v == 0 && notifyf)
+		(*notifyf)(nil, _p9sigstr(sig, tmp));
+	else if(v == 2){
+if(0)print("HANDLED %d\n", sig);
+		return;
+	}
+if(0)print("DEFAULT %d\n", sig);
+	signal(sig, SIG_DFL);
+	kill(getpid(), sig);
+}
+	
+int
+notify(void (*f)(void*, char*))
+{
+	int i;
+	void (*sf)(int);
+
+	if(f == nil)
+		sf = SIG_DFL;
+	else{
+		notifyf = f;
+		sf = notifysigf;
+	}
+	for(i=0; i<nelem(sigs); i++)
+		signal(sigs[i], sf);
+	return 0;
+}
+
+int
+noted(int v)
+{
+	Uproc *up;
+
+	up = _p9uproc();
+	p9longjmp(up->notejb, v==NCONT ? 2 : 1);
+	abort();
+	return 0;
+}