snd_ctl_notify(9)

🌸 NAME 🌸

okay bestie, welcome to the snd_ctl_notify(9) page from the Kernel API Manual 💖

<pink>snd_ctl_notify</pink> — Send notification to user-space for a control change. that's the whole vibe: control change happens, user-space gets notified, slay.

✨ SYNOPSIS ✨

void snd_ctl_notify (struct snd_card *card , unsigned int mask , struct
       snd_ctl_elem_id *id );

🎀 ARGUMENTS 🎀

• card — the card to send notification. yes, this card.
• mask — the event mask, SNDRV_CTL_EVENT_*.
• id — the ctl element id to send notification.

🦋 DESCRIPTION 🦋

ok so real talk: this function adds an event record with the given id and mask, appends it to the list, and wakes up user-space for notification. it's giving “I made a change and I need everyone to know” 💅

🚨 the important caveat, no cap: this can be called in the atomic context. iconic, but please respect it.

🌈 SEE ALSO 🌈

start with the kernel file: ./sound/core/control.c — then the whole bestie lineup:

• snd_ctl_notify_one(9)
• snd_ctl_new(9)
• snd_ctl_new1(9)
• snd_ctl_free_one(9)
• snd_ctl_add(9)
• snd_ctl_replace(9)
• snd_ctl_remove(9)
• snd_ctl_remove_id(9)
• snd_ctl_remove_user_ctl(9)
• snd_ctl_activate_id(9)
• snd_ctl_rename_id(9)
• snd_ctl_rename(9)
• snd_ctl_find_numid(9)
• snd_ctl_find_id(9)
• snd_ctl_register_ioctl(9)
• snd_ctl_register_ioctl_compat(9)
• snd_ctl_unregister_ioctl(9)
• snd_ctl_unregister_ioctl_compat(9)
• snd_ctl_request_layer(9)
• snd_ctl_register_layer(9)
• snd_ctl_disconnect_layer(9)
• snd_ctl_boolean_mono_info(9)
• snd_ctl_boolean_stereo_info(9)
• snd_ctl_enum_info(9)

💌 cute sign-off: source/version is ./sound/core, and the date is October 2026. mwah, bestie 🫶