[LTP] [PATCH 3/6] API/cgroup: Add option for specific pid to tst_cgroup_opts

[Luke Nowakowski-Krijger]

Add an option that would allow to create a test directory with a
specified pid, as opposed to the calling processes pid.

Signed-off-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger@canonical.com>
---
 include/tst_cgroup.h | 3 +++
 lib/tst_cgroup.c     | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/tst_cgroup.h b/include/tst_cgroup.h
index 632050e86..cfcc189ee 100644
--- a/include/tst_cgroup.h
+++ b/include/tst_cgroup.h
@@ -98,6 +98,9 @@ struct tst_cgroup_opts {
 	 * only indicates that we should mount V1 controllers if
 	 * nothing is present. By default we try to mount V2 first. */
 	int only_mount_v1:1;
+	/* Pass in a specific pid to create and identify the test
+	 * directory as opposed to the default pid of the calling process. */
+	int test_pid;
 };
 
 /* A Control Group in LTP's aggregated hierarchy */
diff --git a/lib/tst_cgroup.c b/lib/tst_cgroup.c
index b06ae6ab7..1cec3e722 100644
--- a/lib/tst_cgroup.c
+++ b/lib/tst_cgroup.c
@@ -713,7 +713,11 @@ mkdirs:
 
 	cgroup_dir_mk(&root->ltp_dir, cgroup_ltp_drain_dir, &root->drain_dir);
 
-	sprintf(cgroup_test_dir, "test-%d", getpid());
+	if (options->test_pid)
+		sprintf(cgroup_test_dir, "test-%d", options->test_pid);
+	else
+		sprintf(cgroup_test_dir, "test-%d", getpid());
+
 	cgroup_dir_mk(&root->ltp_dir, cgroup_test_dir, &root->test_dir);
 }
 
-- 
2.32.0