zdtm: Test for UTS namespace

Plus a small infrastructure change to fork a test task
in a desired namespace.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

test/zdtm.sh

@@ -28,6 +28,9 @@ $ZP/static/zombie00
 $ZP/static/cmdlinenv00
 $ZP/static/socket_listen"
 
+NS_TEST_LIST="\
+$ZP/static/utsname"
+
 CRTOOLS=`pwd`/`dirname $0`/../crtools
 
 run_test()
@@ -43,13 +46,13 @@ run_test()
 	dump_path=`pwd`"/"$ddump
 	mkdir -p $ddump
 	ls -l /proc/$pid/fd/
-	setsid $CRTOOLS dump -D $ddump -o dump.log -t $pid || return 1
+	setsid $CRTOOLS dump -D $ddump -o dump.log -t $pid $2 || return 1
 	while :; do
 		killall -9 $tname &> /dev/null || break;
 		echo Waiting...
 		sleep 1
 	done
-	setsid $CRTOOLS restore -D $ddump -o restore.log -d -t $pid || return 2
+	setsid $CRTOOLS restore -D $ddump -o restore.log -d -t $pid $2 || return 2
 	ls -l /proc/$pid/fd/
 	make -C $tdir $tname.out
 	for i in `seq 50`; do
@@ -65,12 +68,20 @@ cd `dirname $0` || exit 1
 
 if [ $# -eq 0 ]; then
 	for t in $TEST_LIST; do
-		run_test $t || exit 1
+		run_test $t "" || exit 1
+	done
+	for t in $NS_TEST_LIST; do
+		run_test $t "-n" || exit 1
 	done
 elif [ "$1" == "-l" ]; then
 	echo $TEST_LIST | sed -e "s#$ZP/##g" -e 's/ /\n/g'
+	echo $NS_TEST_LIST | sed -e "s#$ZP/##g" -e 's/ /\n/g'
 else
-	run_test $ZP/$1 && exit 0
+	if echo "$NS_TEST_LIST" | fgrep -q "$1" ; then
+		run_test "$ZP/$1" "-n" && exit 0
+	else
+		run_test "$ZP/$1" && exit 0
+	fi
 	result=$?
 	echo "====================== ERROR ======================"
 	if [ $result == 1 ]; then

test/zdtm/lib/test.c

@@ -7,6 +7,7 @@
 #include <time.h>
 #include <sys/wait.h>
 #include <fcntl.h>
+#include <sys/mman.h>
 
 #include "zdtmtst.h"
 
@@ -153,6 +154,113 @@ void test_init(int argc, char **argv)
 	srand48(time(NULL));	/* just in case we need it */
 }
 
+#define STACK_SIZE	(8 * 4096)
+
+struct zdtm_clone_arg {
+	int pidf;
+	void (*fn)(void);
+};
+
+static int do_test_fn(void *_arg)
+{
+	struct zdtm_clone_arg *ca = _arg;
+	struct sigaction sa;
+
+	/* record the test pid to remember the ownership of the pidfile */
+	master_pid = getpid();
+
+	fclose(ca->pidf);
+
+	sigemptyset(&sa.sa_mask);
+	sa.sa_handler = SIG_DFL;
+	if (sigaction(SIGCHLD, &sa, NULL)) {
+		err("Can't reset SIGCHLD handler: %m\n");
+		exit(1);
+	}
+
+	if (setsid() < 0) {
+		err("Can't become session group leader: %m\n");
+		exit(1);
+	}
+
+	srand48(time(NULL));	/* just in case we need it */
+
+	ca->fn();
+	exit(0);
+}
+
+void test_init_ns(int argc, char **argv, unsigned long clone_flags, void (*fn)(void))
+{
+	extern void parseargs(int, char **);
+
+	pid_t pid;
+	static FILE *pidf;
+	struct sigaction sa = {
+		.sa_handler	= sig_hand,
+	};
+	struct zdtm_clone_arg ca;
+	void *stack;
+
+	sigemptyset(&sa.sa_mask);
+
+	if (sigaction(SIGTERM, &sa, NULL)) {
+		fprintf(stderr, "Can't set SIGTERM handler: %m\n");
+		exit(1);
+	}
+
+	if (sigaction(SIGCHLD, &sa, NULL)) {
+		fprintf(stderr, "Can't set SIGCHLD handler: %m\n");
+		exit(1);
+	}
+
+	parseargs(argc, argv);
+
+	setup_outfile();
+	redir_stdfds();
+
+	pidf = fopen(pidfile, "wx");
+	if (!pidf) {
+		err("Can't create pid file %s: %m\n", pidfile);
+		exit(1);
+	}
+
+	stack = mmap(NULL, STACK_SIZE, PROT_WRITE | PROT_READ,
+			MAP_PRIVATE | MAP_GROWSDOWN | MAP_ANONYMOUS, -1, 0);
+	if (stack == MAP_FAILED) {
+		err("Can't map stack\n");
+		exit(1);
+	}
+
+	ca.pidf = pidf;
+	ca.fn = fn;
+	pid = clone(do_test_fn, stack + STACK_SIZE, clone_flags | SIGCHLD, &ca);
+	if (pid < 0) {
+		err("Daemonizing failed: %m\n");
+		exit(1);
+	}
+
+	/* parent will exit when the child is ready */
+	test_waitsig();
+
+	if (sig_received == SIGCHLD) {
+		int ret;
+		waitpid(pid, &ret, 0);
+
+		if (WIFEXITED(ret)) {
+			err("Test exited with unexpectedly with code %d\n", WEXITSTATUS(ret));
+			exit(0);
+		}
+		if (WIFSIGNALED(ret)) {
+			err("Test exited on unexpected signal %d\n", WTERMSIG(ret));
+			exit(0);
+		}
+	}
+
+	fprintf(pidf, "%d\n", pid);
+	fclose(pidf);
+	_exit(0);
+}
+
 void test_daemon()
 {
 	pid_t ppid;

test/zdtm/lib/zdtmtst.h

@@ -5,6 +5,12 @@
 
 /* set up test */
 extern void test_init(int argc, char **argv);
+extern void test_init_ns(int argc, char **argv, unsigned long clone_flags, void (*fn)(void));
+
+#ifndef CLONE_NEWUTS
+#define CLONE_NEWUTS 0x04000000
+#endif
+
 /*wrapper for fork: init log offset*/
 extern int test_fork();
 /* finish setting up the test, write out pid file, and go to background */

test/zdtm/live/static/Makefile

@@ -28,6 +28,7 @@ TST_NOFILE	=				\
 		pthread00			\
 		vdso00				\
 		cmdlinenv00			\
+		utsname				\
 #		jobctl00			\
 
 TST_FILE	=				\