register_trigger(9)

💅 register_trigger(9)

okay so you're in the Kernel API Manual bestie, welcome to the register_trigger page — yes it's a section 9 (kernel API) situation, we're deep in the kernel internals and honestly? iconic behavior.

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✨ NAME ✨

register_trigger — the generic event_command @reg implementation. that's it, that's the vibe 🎀

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🦋 SYNOPSIS 🦋

int register_trigger (char *glob , struct event_trigger_data *data ,
struct trace_event_file *file );

like, three args, one int out, no drama 💅

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🌸 ARGUMENTS 🌸

• glob — the raw string you used to register the trigger. just the raw string, bestie, no filter, no hot take
• data — the trigger-specific data you wanna associate with the trigger 🫶
• file — the trace_event_file that's associated with the event

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💖 DESCRIPTION 💖

so this is the common implementation for event trigger registration. lowkey the main character of the registration flow ✨

usually it's used directly as the reg method in event command implementations — like, not even wrapped, just plugged straight in. it's giving "I don't need a middleman" energy fr fr.

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🔥 RETURN 🔥

• 0 on success 🎉
• errno otherwise 😭

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👑 SEE ALSO 👑

okay this list is LONG but I'm not skipping a single one, we respect every function in this house 🫶

• the kernel file ./kernel/trace/trace_events_trigger.c
• event_triggers_call(9)
• event_triggers_post_call(9)
• event_trigger_count(9)
• event_trigger_print(9)
• event_trigger_init(9)
• event_trigger_free(9)
• clear_event_triggers(9)
• update_cond_flag(9)
• unregister_trigger(9)
• event_trigger_check_remove(9)
• event_trigger_empty_param(9)
• event_trigger_separate_filter(9)
• trigger_data_alloc(9)
• event_trigger_parse_num(9)
• event_trigger_set_filter(9)
• event_trigger_reset_filter(9)
• event_trigger_register(9)
• event_trigger_unregister(9)
• event_trigger_parse(9)
• set_trigger_filter(9)
• find_named_trigger(9)
• is_named_trigger(9)
• save_named_trigger(9)
• del_named_trigger(9)
• pause_named_trigger(9)
• unpause_named_trigger(9)
• set_named_trigger_data(9)

like, the whole friend group showed up. no cap 🌈

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ngl, if you got here by accident looking for userspace stuff — you're in the kernel trace trigger lore now. there's no going back 💀

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and that's the page!! 🎀 this one lives in ./kernel/trace and it's dated October 2026 — mwah, sending you off with a register_trigger(9) and a lil kiss 💋✨