cgroup_get_from_fd(9)

💜 cgroup_get_from_fd(9) — Kernel API Manual ✨

hiii welcome to the Kernel API Manual bestie 🫶 we're doing cgroup stuff today and honestly it's a short one, so grab your lil iced coffee and let's go 🧚

🌸 NAME 🌸

cgroup_get_from_fd — okay so it's literally the same as cgroup_v1v2_get_from_fd, except this one only supports cgroup2. that's it. that's the whole personality 💅 ("but only supports cgroup2.")

✨ SYNOPSIS ✨

struct cgroup * cgroup_get_from_fd (int fd );

🎀 ARGUMENTS 🎀

• fd — a file descriptor you got from open(cgroup2_dir) 👑 that's the whole vibe. hand it a cgroup2 dir fd and you're good.

🦋 SEE ALSO 🦋

Kernel file ./kernel/cgroup/cgroup.c — and ngl, the friends list here is long, so buckle up bestie, we're going down the whole group chat 😭 every single one of these is invited to the party:

cgroup_ssid_enabled(9), cgroup_on_dfl(9), cgroup_e_css_by_mask(9), cgroup_e_css(9), cgroup_get_e_css(9), __cgroup_task_count(9), cgroup_task_count(9), for_each_css(9), do_each_subsys_mask(9), css_set_populated(9), css_update_populated(9), css_set_update_populated(9), css_set_move_task(9), compare_css_sets(9), find_existing_css_set(9), allocate_cgrp_cset_links(9), link_css_set(9), find_css_set(9), cgroup_file_mode(9), cgroup_calc_subtree_ss_mask(9), cgroup_kn_unlock(9), cgroup_kn_lock_live(9), css_clear_dir(9), css_populate_dir(9), cgroup_attach_lock(9), cgroup_attach_unlock(9), cgroup_migrate_add_task(9), cgroup_taskset_first(9), cgroup_taskset_next(9), cgroup_migrate_execute(9), cgroup_migrate_vet_dst(9), cgroup_migrate_finish(9), cgroup_migrate_add_src(9), cgroup_migrate_prepare_dst(9), cgroup_migrate(9), cgroup_attach_task(9), cgroup_update_dfl_csses(9), cgroup_lock_and_drain_offline(9), cgroup_save_control(9), cgroup_propagate_control(9), cgroup_restore_control(9), cgroup_apply_control_enable(9), cgroup_apply_control_disable(9), cgroup_apply_control(9), cgroup_finalize_control(9), cgroup_enable_threaded(9), cgroup_tryget_css(9), cgroup_addrm_files(9), cgroup_rm_cftypes(9), cgroup_add_cftypes(9), cgroup_add_dfl_cftypes(9), cgroup_add_legacy_cftypes(9), cgroup_file_notify(9), cgroup_file_show(9), css_next_child(9), css_next_descendant_pre(9), css_rightmost_descendant(9), css_next_descendant_post(9), css_has_online_children(9), css_task_iter_advance_css_set(9), css_task_iter_start(9), css_task_iter_next(9), css_task_iter_end(9), css_create(9), kill_css_sync(9), kill_css_finish(9), cgroup_destroy_locked(9), cgroup_init_early(9), cgroup_init(9), cgroup_fork(9), cgroup_v1v2_get_from_file(9), cgroup_get_from_file(9), cgroup_css_set_fork(9), cgroup_css_set_put_fork(9), cgroup_can_fork(9), cgroup_cancel_fork(9), cgroup_post_fork(9), cgroup_task_exit(9), css_tryget_online_from_dir(9), css_from_id(9), cgroup_get_from_path(9), cgroup_v1v2_get_from_fd(9), cgroup_parse_float(9)

like I said. the whole group chat 💀 ily though. read every single one, iykyk 🔥

🎀 reminder bestie: this one is cgroup2-only, so if you're living that cgroup v1 life, cgroup_get_from_fd is not the function for you — go say hi to cgroup_v1v2_get_from_fd(9) instead. no cap. 💅

that's the page!! mwah 💖 this has been cgroup_get_from_fd(9) from the Kernel API Manual, sourced from ./kernel/cgroup, dated October 2026 — slay, go touch some cgroups, periodt ✨👑