[LTP] [PATCH 02/19] API/cgroup: Add option for specific pid to tst_cg_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 | 4 ++++
 lib/tst_cgroup.c     | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/tst_cgroup.h b/include/tst_cgroup.h
index 6ba3727f3..87e55f4df 100644
--- a/include/tst_cgroup.h
+++ b/include/tst_cgroup.h
@@ -97,6 +97,10 @@ struct tst_cg_opts {
 	 * version. Defautls to zero to accept any version.
 	 */
 	enum tst_cg_ver needs_ver;
+	/* 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 1abcbaf5a..a3416f4df 100644
--- a/lib/tst_cgroup.c
+++ b/lib/tst_cgroup.c
@@ -714,7 +714,11 @@ 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