try to implement the daemonize hack.

1 files changed, 43 insertions, 1 deletions

diff --git a/src/libthread/main.c b/src/libthread/main.c
index 83ee177c..ec085430 100644
--- a/src/libthread/main.c
+++ b/src/libthread/main.c
@@ -11,7 +11,11 @@ struct Mainarg
 	char **argv;
 };
 
+int _threadmainpid;
 int mainstacksize;
+int _callsthreaddaemonize;
+static int passtomainpid;
+
 extern void (*_sysfatal)(char*, va_list);
 
 static void
@@ -25,15 +29,53 @@ mainlauncher(void *arg)
 	threadexits("threadmain");
 }
 
+static void
+passer(void *x, char *msg)
+{
+	USED(x);
+	Waitmsg *w;
+
+	if(strcmp(msg, "sys: usr2") == 0)
+		_exit(0);	/* daemonize */
+	else if(strcmp(msg, "sys: child") == 0){
+		w = wait();
+		if(w == nil)
+			_exit(1);
+		_exit(atoi(w->msg));
+	}else
+		postnote(PNPROC, passtomainpid, msg);
+}
+
 int
 main(int argc, char **argv)
 {
+	int pid;
 	Mainarg a;
 	Proc *p;
+	sigset_t mask;
 
 	/*
-	 * XXX Do daemonize hack here.
+	 * Do daemonize hack here.
 	 */
+	if(_callsthreaddaemonize){
+		passtomainpid = getpid();
+		switch(pid = fork()){
+		case -1:
+			sysfatal("fork: %r");
+
+		case 0:
+			/* continue executing */
+			_threadmainpid = getppid();
+			break;
+
+		default:
+			/* wait for signal USR2 */
+			notify(passer);
+			for(;;)
+				pause();
+			_exit(0);
+		}
+	}
 
 	/*
 	 * Instruct QLock et al. to use our scheduling functions