zdtm: check, that stopped tasks are restored correctly

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -94,6 +94,7 @@ static/sk-netlink
 static/proc-self
 static/grow_map
 static/grow_map02
+static/stopped
 static/chroot
 static/chroot-file
 "

test/zdtm/live/static/Makefile

@@ -102,6 +102,7 @@ TST_NOFILE	=				\
 		grow_map			\
 		grow_map02			\
 		tun				\
+		stopped				\
 #		jobctl00			\
 
 TST_FILE	=				\

test/zdtm/live/static/stopped.c

@@ -0,0 +1,67 @@
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check, that stopped tasts are restored correctly";
+const char *test_author	= "Andrew Vagin <avagin@parallels.com>";
+
+int main(int argc, char **argv)
+{
+	pid_t pid;
+	int p[2], ret, status;
+
+	test_init(argc, argv);
+
+	if (pipe(p)) {
+		err("Unable to create pipe");
+		return 1;
+	}
+
+	pid = test_fork();
+	if (pid < 0)
+		return -1;
+	else if (pid == 0) {
+		char c;
+
+		close(p[1]);
+		ret = read(p[0], &c, 1);
+		if (ret != 1) {
+			err("Unable to read: %d", ret);
+			return 1;
+		}
+
+		ret = read(p[0], &c, 1);
+		if (ret != 0) {
+			err("Unable to read: %d", ret);
+			return 1;
+		}
+
+		return 0;
+	}
+	close(p[0]);
+
+	kill(pid, SIGSTOP);
+	write(p[1], "0", 1);
+
+	test_daemon();
+	test_waitsig();
+
+	kill(pid, SIGCONT);
+	if (waitpid(pid, &status, WCONTINUED) == -1) {
+		err("Unable to wait child");
+		goto out;
+	}
+
+	if (WIFCONTINUED(status))
+		pass();
+	else
+		fail("The process doesn't continue");
+out:
+	close(p[1]);
+	waitpid(pid, &status, 0);
+
+	return 0;
+}