Migration with vfork

This is old missed test. Fail expected.
Signed-off-by: Pavel Ganyushin <pganyushin@odin.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -142,6 +142,7 @@ TST_NOFILE	=				\
 		different_creds			\
 		vsx				\
 		bridge				\
+		vfork00				\
 #		jobctl00			\
 
 TST_FILE	=				\

test/zdtm/live/static/vfork00.c

+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <string.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Block migration by a pending (non-exec()-ed) vfork()";
+const char *test_author	= "Pavel Emelianov <xemul@sw.ru>";
+
+int main(int argc, char ** argv)
+{
+	int ret = 0;
+	pid_t pid;
+
+	test_init(argc, argv);
+
+	/* vfork() won't let us control the test, so fork() first, and vfork()
+	 * in the child */
+	pid = fork();
+	if (pid < 0) {
+		err("fork failed: %m");
+		exit(1);
+	}
+
+	if (pid == 0) {
+		int ret2;
+
+		pid = vfork();
+		if (pid < 0)
+			ret = errno;
+
+		/* wait for signal in _both_ branches */
+		test_waitsig();
+
+		/* vforked guy shouldn't return, hence we exec() */
+		if (pid == 0)
+			execlp("/bin/true", "true", NULL);
+
+		if (wait(&ret2) != pid)
+			ret = errno;
+
+		_exit(ret);
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	/* signal the whole process group, because our child is suspended until
+	 * the grand-child has exec()-ed, but we don't know the pid of the
+	 * latter */
+	if (kill(0, SIGTERM)) {
+		fail("terminating the children failed: %m");
+		exit(1);
+	}
+
+	if (wait(&ret) != pid) {
+		fail("wait() returned wrong pid: %m");
+		exit(1);
+	}
+
+	if (WIFEXITED(ret)) {
+		ret = WEXITSTATUS(ret);
+		if (ret) {
+			fail("child exited with nonzero code %d (%s)", ret, strerror(ret));
+			exit(1);
+		}
+	}
+	if (WIFSIGNALED(ret)) {
+		fail("child exited on unexpected signal %d", WTERMSIG(ret));
+		exit(1);
+	}
+
+	pass();
+	return 0;
+}

test/zdtm/live/static/vfork00.desc

+{'flags': 'noauto'}