get_cgroup_id_from_path(9)

💖 get_cgroup_id_from_path(9) 💖

Bestie, welcome to the get_cgroup_id_from_path(9) page from the Kernel API Manual ✨ this one is short and sweet, and we are literally getting a cgroup id from a path. Slay.

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✨ NAME ✨

get_cgroup_id_from_path — get the cgroup id for a particular cgroup path 🎀

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🌸 SYNOPSIS 🌸

unsigned long long get_cgroup_id_from_path (const char *cgroup_workdir
);

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🦋 ARGUMENTS 🦋

• cgroup_workdir — the absolute cgroup path, no cap. That's the whole argument, bestie 💅

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🔥 DESCRIPTION 🔥

Okay so on success, it returns the cgroup id, periodt ✨

On failure it returns 0, which is an invalid cgroup id — so do not treat that like a real one, fr fr 🙈

If there is a failure, it prints the error to stderr 💀

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👑 SEE ALSO 👑

Kernel file ./tools/testing/selftests/bpf/cgroup_helpers.c — iykyk 🫶

• enable_controllers(9)
• write_cgroup_file(9)
• write_cgroup_file_parent(9)
• setup_cgroup_environment(9)
• join_cgroup(9)
• join_root_cgroup(9)
• join_parent_cgroup(9)
• set_cgroup_xattr(9)
• __cleanup_cgroup_environment(9)
• cleanup_cgroup_environment(9)
• get_root_cgroup(9)
• create_and_get_cgroup(9)
• setup_classid_environment(9)
• set_classid(9)
• join_classid(9)
• cleanup_classid_environment(9)
• get_classid_cgroup_id(9)
• get_cgroup1_hierarchy_id(9)
• open_classid(9)

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Signing off with source/version ./tools/testing/selftests/bpf, dated October 2026, for get_cgroup_id_from_path(9) — mwah 💋💖