trigger_data_alloc(9)

💖 trigger_data_alloc(9) — Kernel API Manual 💖

okay so bestie, welcome to the Kernel API Manual entry for trigger_data_alloc(9) — manual name folded in, cute little header moment, we move 💅. This page is literally about allocating and initializing an event_trigger_data for a trigger.

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🌸 NAME 🌸

trigger_data_alloc — allocate and init event_trigger_data for a trigger.

✨ SYNOPSIS ✨

the signature, no cap:

struct event_trigger_data * trigger_data_alloc (struct event_command
       *cmd_ops , char *cmd , char *param , void *private_data );

🎀 ARGUMENTS 🎀

• cmd_ops — the event_command operations for the trigger.
• cmd — the cmd string.
• param — the param string.
• private_data — user data to associate with the event trigger.

🦋 DESCRIPTION 🦋

so what it does: it allocates an event_trigger_data instance and initializes it ✨. The cmd_ops defines how the trigger will operate.

If param is set, and cmd_ops->trigger_ops->count_func is non-NULL, then data->count is set to param, and before the trigger is executed, the cmd_ops->trigger_ops->count_func is called. If that function returns false, the cmd_ops->trigger_ops->trigger function will not be called. important caveat energy: that's the actual behavior, don't skip the check 😭.

private_data can also be passed in and associated with the event_trigger_data.

Use trigger_data_free to free an event_trigger_data object. free your stuff, bestie 🫶.

🌈 RETURN 🌈

On success, the trigger_data object; otherwise NULL 😭. That's the whole vibe.

👑 SEE ALSO 👑

Kernel file ./kernel/trace/trace_events_trigger.c — the source, iykyk. And peep these too:

• 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)
• register_trigger(9)
• unregister_trigger(9)
• event_trigger_check_remove(9)
• event_trigger_empty_param(9)
• event_trigger_separate_filter(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)

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byeee 💋 — source/version ./kernel/trace, date October 2026 🎀