From: Sudhir Kumar <skumar@linux.vnet.ibm.com>

libcgroup: adds sanity check in libcgroup testcases binary

This patch adds a sanity check on cgroup file system info in testcases.
If cgroup filesystem is not mounted and script sends the info as mounted,
then the binar would have failed. This patch handles that.

Signed-off-by: Sudhir Kumar <skumar@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>


git-svn-id: https://libcg.svn.sourceforge.net/svnroot/libcg/trunk@95 4f4bb910-9a46-0410-90c8-c897d4f1cd53

2 files changed, 36 insertions, 0 deletions

diff --git a/tests/libcgrouptest.h b/tests/libcgrouptest.h
index 1efc4b8..73c4a9b 100644
--- a/tests/libcgrouptest.h
+++ b/tests/libcgrouptest.h
@@ -20,6 +20,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <mntent.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -67,6 +68,7 @@ static int set_controller(int controller, char *controller_name,
 static int group_modified(char *path_control_file, int value_type);
 struct cgroup *new_cgroup(char *group, char *controller_name,
 				 char *control_file, int value_type);
+int check_fsmounted();
 
 static inline pid_t cgrouptest_gettid()
 {
diff --git a/tests/libcgrouptest01.c b/tests/libcgrouptest01.c
index a57c3ab..2ec63ec 100644
--- a/tests/libcgrouptest01.c
+++ b/tests/libcgrouptest01.c
@@ -149,6 +149,13 @@ int main(int argc, char *argv[])
 
 	case FS_MOUNTED:
 
+		/* Do a sanity check if cgroup fs is mounted */
+		if (check_fsmounted()) {
+			printf("Sanity check fails. cgroup fs not mounted\n");
+			printf("Exiting without running this set of tests\n");
+			exit(1);
+		}
+
 		/*
 		 * Test01: call cgroup_attach_task() with null group
 		 * without calling cgroup_inti(). We can check other apis too.
@@ -570,3 +577,30 @@ struct cgroup *new_cgroup(char *group, char *controller_name,
 	}
 	return newcgroup;
 }
+
+int check_fsmounted()
+{
+	struct mntent *entry, *tmp_entry;
+	/* Need a better mechanism to decide memory allocation size here */
+	char entry_buffer[FILENAME_MAX * 4];
+	FILE *proc_file;
+
+	tmp_entry = (struct mntent *) malloc(sizeof(struct mntent *));
+	if (!tmp_entry) {
+		perror("Error: failled to mallloc for mntent\n");
+		return 1;
+	}
+
+	proc_file = fopen("/proc/mounts", "r");
+	if (!proc_file) {
+		printf("Error in opening /proc/mounts.\n");
+		return EIO;
+	}
+	while ((entry = getmntent_r(proc_file, tmp_entry, entry_buffer, FILENAME_MAX*4)) != NULL) {
+		if (!strncmp(entry->mnt_type, "cgroup", strlen("cgroup"))) {
+			printf("sanity check pass.... %s\n", entry->mnt_type);
+			return 0;
+		}
+	}
+	return 1;
+}