qa: nested_note checks that notes are enqueued in kernel

qa/kern/build.json

@@ -5,7 +5,8 @@
 		],
 		"Install": "/arch/$ARCH/qa/kern",
 		"Post": [
-			"cp *.rc $JEHANNE/arch/$ARCH/qa/kern/"
+			"cp *.rc $JEHANNE/arch/$ARCH/qa/kern/",
+			"cp *.runner $JEHANNE/arch/$ARCH/qa/kern/"
 		],
 		"SourceFilesCmd": [
 			"alarm.c",
@@ -26,6 +27,7 @@
 			"mixedfloat.c",
 			"noexecmem.c",
 			"notify.c",
+			"nested_note.c",
 			"nsec.c",
 			"pipering.c",
 			"postnote.c",

qa/kern/nested_note.c

@@ -0,0 +1,48 @@
+#include <u.h>
+#include <lib9.h>
+
+int done;
+int waited;
+
+void
+handler(void *v, char *s)
+{
+	int i;
+	if(strcmp(s, "stop") == 0){
+		done = 1;
+		noted(NCONT);
+	}
+	print("waiting after %s", s);
+	for(i = 0; i < 1000*1000; ++i)
+		if(i % 4999 == 0)
+			print(".");
+	print("\n");
+	print("wait after %s terminated\n", s);
+	waited++;
+	noted(NCONT);
+}
+
+void
+main(int argc, char**argv)
+{
+	int fd;
+	if(argc > 1){
+		fd = ocreate(argv[1], OWRITE, 0666);
+		dup(fd, 1);
+		close(fd);
+	}
+
+	if (notify(handler)){
+		fprint(2, "%r\n");
+		exits("notify fails");
+	}
+
+	print("note handler installed\n");
+
+	while(!done)
+		sleep(100);
+	if(waited == 2){
+		print("PASS\n");
+		exits(0);
+	}
+}

qa/kern/nested_note.runner

@@ -0,0 +1,35 @@
+#!/cmd/rc
+
+# this test ensure that notes are enqueued in kernel
+
+runner=$0
+test = `{echo $runner|sed 's/.runner//'}
+test_output = /tmp/output-`{basename $test}
+
+if ( test -e $test_output) rm $test_output
+
+$test $test_output &
+testpid = $apid
+
+while ( ! test -e $test_output ) { sleep 2 }
+
+echo $test started, output to $test_output, kill at /proc/$testpid/ctl
+
+echo -n first > /proc/$testpid/note
+echo -n second > /proc/$testpid/note
+echo -n stop > /proc/$testpid/note
+
+wait $testpid
+
+if ( cat $test_output | grep 'waiting after first.........................................................................................................................................................................................................' > /dev/null ) {
+if ( cat $test_output | grep 'waiting after second.........................................................................................................................................................................................................' > /dev/null ) {
+if ( cat $test_output | grep 'PASS' > /dev/null ) {
+	rm $test_output
+	echo PASS
+	exit PASS
+}
+}
+}
+cat $test_output
+echo FAIL
+exit FAIL