alarm_handle_timer(9)

💅 alarm_handle_timer(9) — like, the kernel API manual, but make it make sense

okay so bestie, welcome to the Kernel API Manual, section 9, and today's main character is alarm_handle_timer ✨ she's a callback, she's a posix timer girlie, and she's literally the one who gets pinged when your alarm goes off. let's get into it 🎀

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🦋 SYNOPSIS

void alarm_handle_timer (struct alarm *alarm , ktime_t now );

look at her. two args, returns nothing, void energy, unbothered, moisturized, in her lane 💅

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✨ ARGUMENTS

• alarm — the alarm that fired 🔔 like, the actual one that went off. that's her.
• now — the time at the timer expiration ⏰ so you know exactly when the thing popped. timestamped, no cap.

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🌸 DESCRIPTION

okay so real talk: this is the posix timer callback for expired alarm timers. that's the whole vibe. when an alarm timer expires, this is the function that gets called to handle it 🫶 short, sweet, iconic. she doesn't do small talk, she just handles the timer. periodt.

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💜 SEE ALSO

bestie there is a whole friend group here, and honestly the lore is deep. go check the kernel file ./kernel/time/alarmtimer.c and then say hi to the whole crew:

• struct alarm_base(9)
• alarmtimer_get_rtcdev(9)
• alarmtimer_enqueue(9)
• alarmtimer_dequeue(9)
• alarmtimer_fired(9)
• alarmtimer_suspend(9)
• alarm_init(9)
• alarm_start_timer(9)
• alarm_try_to_cancel(9)
• alarm_cancel(9)
• clock2alarm(9)
• alarm_timer_rearm(9)
• alarm_timer_forward(9)
• alarm_timer_remaining(9)
• alarm_timer_try_to_cancel(9)
• alarm_timer_wait_running(9)
• alarm_timer_arm(9)
• alarm_clock_getres(9)
• alarm_clock_get_timespec(9)
• alarm_clock_get_ktime(9)
• alarm_timer_create(9)
• alarmtimer_nsleep_wakeup(9)
• alarmtimer_do_nsleep(9)
• alarm_timer_nsleep_restart(9)
• alarm_timer_nsleep(9)
• alarmtimer_init(9)

like. the whole squad. iykyk 💀🔥

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ngl, that's genuinely the entire page. she's a small function with a big job and a very long contact list.

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and that's the tea, bestie 🍓 this little gem lives over in ./kernel/time, dated October 2026, and she's page alarm_handle_timer(9) of the Kernel API Manual. go handle those timers, queen 👑💖