zdtm: Stupid test for task-in-cgroup

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -137,6 +137,7 @@ transition/ipc
 ns/static/tun
 static/netns-nf
 static/netns
+static/cgroup00
 "
 
 TEST_CR_KERNEL="
@@ -166,6 +167,7 @@ tempfs
 bind-mount
 mountpoints
 inotify_irmap
+cgroup00
 "
 
 source $(readlink -f `dirname $0`/env.sh) || exit 1

test/zdtm/live/static/Makefile

@@ -154,6 +154,7 @@ TST_DIR		=				\
 		overmount_sock			\
 		tempfs				\
 		bind-mount			\
+		cgroup00			\
 
 TST_DIR_FILE	=				\
 		chroot				\

test/zdtm/live/static/cgroup00.c

+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that cgroups layout is preserved";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "cgroup directory name", 1);
+static const char *cgname = "zdtmtst";
+static const char *subname = "subcg";
+
+int main(int argc, char **argv)
+{
+	int cgfd, l, ret = 1;
+	char aux[32], paux[1024];
+	FILE *cgf;
+
+	test_init(argc, argv);
+
+	if (mkdir(dirname, 0700) < 0) {
+		err("Can't make dir");
+		goto out;
+	}
+
+	sprintf(aux, "none,name=%s", cgname);
+	if (mount("none", dirname, "cgroup", 0, aux)) {
+		err("Can't mount cgroups");
+		goto out_rd;
+	}
+
+	sprintf(paux, "%s/%s", dirname, subname);
+	mkdir(paux, 0600);
+
+	l = sprintf(aux, "%d", getpid());
+	sprintf(paux, "%s/%s/tasks", dirname, subname);
+
+	cgfd = open(paux, O_WRONLY);
+	if (cgfd < 0) {
+		err("Can't open tasks");
+		goto out_rs;
+	}
+
+	l = write(cgfd, aux, l);
+	close(cgfd);
+
+	if (l < 0) {
+		err("Can't move self to subcg");
+		goto out_rs;
+	}
+
+	close(cgfd);
+
+	test_daemon();
+	test_waitsig();
+
+	cgf = fopen("/proc/self/cgroup", "r");
+	if (cgf == NULL) {
+		fail("No cgroups file");
+		goto out_rs;
+	}
+
+	sprintf(aux, "name=%s:/%s\n", cgname, subname);
+	while (fgets(paux, sizeof(paux), cgf)) {
+		char *s;
+
+		s = strchr(paux, ':') + 1;
+		test_msg("CMP [%s] vs [%s]\n", s, aux);
+		if (!strcmp(s, aux)) {
+			ret = 0;
+			break;
+		}
+	}
+
+	fclose(cgf);
+
+	if (!ret)
+		pass();
+	else
+		fail("Task is not in subgroups");
+
+out_rs:
+	sprintf(paux, "%s/%s", dirname, subname);
+	rmdir(paux);
+	umount(dirname);
+out_rd:
+	rmdir(dirname);
+out:
+	return ret;
+}