DevinLeamy commented on code in PR #549:
URL: https://github.com/apache/mesos/pull/549#discussion_r1553739387
##########
src/linux/cgroups2.cpp:
##########
@@ -306,6 +308,45 @@ bool exists(const string& cgroup)
}
+Try<set<string>> get(const string& cgroup)
+{
+ const string& path = cgroups2::path(cgroup);
+ char* paths[] = {const_cast<char*>(path.c_str()), nullptr};
+
+ FTS* tree = fts_open(paths, FTS_NOCHDIR, nullptr);
+ if (tree == nullptr) {
+ return ErrnoError("Failed to start traversing filesystem");
+ }
+
+ FTSENT* node;
+ set<string> cgroups;
+ while ((node = fts_read(tree)) != nullptr) {
+ // Use post-order walk here. fts_level is the depth of the traversal,
+ // numbered from -1 to N, where the file/dir was found. The traversal root
+ // itself is numbered 0. fts_info includes flags for the current node.
+ // FTS_DP indicates a directory being visited in postorder.
+ if (node->fts_level > 0 && node->fts_info & FTS_DP) {
+ string _cgroup = strings::trim(
+ node->fts_path + MOUNT_POINT.length(), "/");
+ cgroups.insert(_cgroup);
+ }
+ }
+
+ if (errno != 0) {
+ Error error =
+ ErrnoError("Failed to read a node while traversing the filesystem");
+ fts_close(tree);
+ return error;
+ }
+
+ if (fts_close(tree) != 0) {
+ return ErrnoError("Failed to stop traversing file system");
+ }
+
+ return cgroups;
+}
Review Comment:
`cgroups::get`:
https://github.com/apache/mesos/blob/b23908fa9c520a941111bf4c56ceee64d14331f1/src/linux/cgroups.cpp#L770
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