snd_ctl_replace(9)

💖 snd_ctl_replace(9) 💖

okay bestie, so this one is from the Kernel API Manual (that's the kernel API docs, section 9, the driver-funcs girlies) and it's literally about swapping out a control instance on your sound card. very main character energy for a kernel function ngl 💅

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✨ NAME ✨

snd_ctl_replace — replace the control instance of the card 🎛️

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🎀 SYNOPSIS 🎀

int snd_ctl_replace (struct snd_card *card , struct snd_kcontrol *kcontrol , bool add_on_replace );

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🦋 ARGUMENTS 🦋

• card — the card instance. like, the sound card we're doing all this to 🎧
• kcontrol — the control instance you wanna replace, bestie
• add_on_replace — add the control if it's not already added. so like, a little bonus feature 🫶

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🌸 DESCRIPTION 🌸

So what it does: it replaces the control you handed it. If that control doesn't exist yet and you set the add_on_replace flag, then it just gets added instead — no drama. But if the control does exist? It's destroyed first. gone. reduced to atoms 💀

It also frees automatically the control that can't be added or replaced. like, if it doesn't make it in, it doesn't linger — the function cleans up after itself, we love a self-sufficient icon ✨

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⭐ RETURN ⭐

Returns zero if it slayed (successful), or a negative error code on failure 😭

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🔥 SEE ALSO 🔥

Kernel file ./sound/core/control.c — and the whole control.c friend group, fr fr:

snd_ctl_notify(9), snd_ctl_notify_one(9), snd_ctl_new(9), snd_ctl_new1(9), snd_ctl_free_one(9), snd_ctl_add(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)

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ok that's the whole page, no cap, every flag and every reference is in there 🫡

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and that's a wrap, babe 🌈✨ this one lives in ./sound/core, dated October 2026, and it goes by snd_ctl_replace(9) — mwah, go replace some controls responsibly 💋👑