join_parent_cgroup(9)

💖 NAME 💖

This is join_parent_cgroup(9) from the Kernel API Manual, and it's giving tiny-but-mighty helper energy: join a cgroup in the parent process workdir. That's the whole assignment, bestie. 💅✨

✨ SYNOPSIS ✨

int join_parent_cgroup (const char *relative_path );

🎀 ARGUMENTS 🎀

• relative_path — the cgroup path, relative to the parent process workdir, to join. That's it: you're handing it the path from the parent process workdir, and it knows what to do. 🫶

🦋 DESCRIPTION 🦋

Okay so the lore is short and sweet: See join_cgroup. That's the cross-reference, bestie — this page is lowkey delegating the full story. 😌

On success, it returns 0; otherwise on failure it returns 1. No cap, those are the numbers. 💀

🌈 SEE ALSO 🌈

Kernel file: ./tools/testing/selftests/bpf/cgroup_helpers.c — noted, bestie. 🎀

Go give these friends a read, iykyk:

• enable_controllers(9)
• write_cgroup_file(9)
• write_cgroup_file_parent(9)
• setup_cgroup_environment(9)
• join_cgroup(9)
• join_root_cgroup(9)
• set_cgroup_xattr(9)
• __cleanup_cgroup_environment(9)
• cleanup_cgroup_environment(9)
• get_root_cgroup(9)
• create_and_get_cgroup(9)
• get_cgroup_id_from_path(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)

Catch you from the ./tools/testing/selftests/bpf source corner, dated October 2026, with join_parent_cgroup(9) energy forever. 💖✨