From: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Date: Fri, 27 Sep 2024 06:45:09 +0000 (+0530)
Subject: api.c: add support to build procs path for cgroup.thread
X-Git-Tag: v3.2.0~44
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=48f3ceb7b4329e311b3682679826486e5a3e152e;p=thirdparty%2Flibcgroup.git

api.c: add support to build procs path for cgroup.thread

In cgroup_build_tid_path(), add support for building path to write
tid into cgroup.thread instead of cgroup.procs, if the calling function
is cgroup_attach_thread_tid() or else build path to write into
cgroup.procs.

Fixes: https://github.com/libcgroup/libcgroup/issues/441
Reported-by: Adriaan Schmidt <adriaan.schmidt@siemens.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
---

diff --git a/src/api.c b/src/api.c
index 49ee1501..e3644ffc 100644
--- a/src/api.c
+++ b/src/api.c
@@ -2021,6 +2021,7 @@ err:
 
 static int cgroup_build_tid_path(const char * const ctrl_name, char *path)
 {
+	char cg_type[CGV2_CONTROLLERS_LL_MAX];
 	enum cg_version_t version;
 	size_t len;
 	int ret;
@@ -2029,6 +2030,25 @@ static int cgroup_build_tid_path(const char * const ctrl_name, char *path)
 	if (ret)
 		return ret;
 
+	if (version == CGROUP_V2) {
+
+		len = strlen(path) - 12;
+		if (strncmp(path + len, "cgroup.procs", 12) != 0) {
+			ret = ECGOTHER;
+			return ret;
+		}
+
+		/* right trim cgroup.procs file name in the path */
+		path[len] = '\0';
+
+		ret = cgroup_get_cg_type(path, cg_type, sizeof(cg_type), 1);
+		if (ret)
+			return ret;
+
+		strncat(path, cg_type, FILENAME_MAX - (len + 1));
+		path[FILENAME_MAX - 1] = '\0';
+	}
+
 	if (version != CGROUP_V1)
 		return ret;