refactor: simplify the Plan 9 runtime loop

main.c

@@ -7,13 +7,6 @@ Channel *dictreqc;
 Channel *dictresc;
 char *fontdir;
 
-int
-threadmaybackground(void)
-{
-	/* Keep the launcher PID stable so supervisors can own this daemon. */
-	return 0;
-}
-
 void
 usage(void)
 {
@@ -39,10 +32,9 @@ emalloc(ulong n)
 {
 	void *p;
 
-	p = malloc(n);
+	p = mallocz(n, 1);
 	if(p == nil)
 		die("out of memory");
-	memset(p, 0, n);
 	return p;
 }
 
@@ -58,9 +50,6 @@ erealloc(void *p, ulong n)
 void
 threadmain(int argc, char **argv)
 {
-	Channel *waitc;
-	uchar stop;
-
 	if(argc != 3)
 		usage();
 
@@ -81,10 +70,5 @@ threadmain(int argc, char **argv)
 		die("can't create Wayland worker");
 	if(threadcreate(dictthread, nil, 16384) < 0)
 		die("can't create dictionary worker");
-	if(threadcreate(imthread, nil, 16384) < 0)
-		die("can't create input worker");
-
-	/* Keep the supervising process and its externally visible PID alive. */
-	waitc = chancreate(sizeof stop, 0);
-	chanrecv(waitc, &stop);
+	imthread(nil);
 }