snd_ctl_sync_vmaster(9)

💅 snd_ctl_sync_vmaster(9) 💅

okay bestie, welcome to the Kernel API Manual — yes we're in kernel land now, and yes you're gonna slay it 🫶 this one's all about snd_ctl_sync_vmaster, and it's honestly such a vibe once you get it.

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🌸 NAME 🌸

snd_ctl_sync_vmaster — sync the vmaster followers and the hook, like a little group-chat refresh for your audio controls ✨

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🎀 SYNOPSIS 🎀

void snd_ctl_sync_vmaster(struct snd_kcontrol *kcontrol, bool hook_only);

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🦋 ARGUMENTS 🦋

• kcontrol — the vmaster kctl element 💖 this is your main character, the one doing the syncing.
• hook_only — sync only the hook 🙈 like, just the hook, nothing else, thank you very much.

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✨ DESCRIPTION ✨

so here's the tea ☕ — this function forcibly calls the put callback of each follower, and then calls the hook function, all so everything gets synchronized with the current value of the vmaster element you handed it. it's giving "everyone get on the same page, periodt" 👑

and the very important bit: it's a NOP when NULL is passed to kcontrol — literally does nothing, no crash, no drama, just vibes 💀 so if kcontrol is NULL, the function is just standing there like 🧍

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👑 SEE ALSO 👑

• the kernel file ./sound/core/vmaster.c — the whole source, go read it iykyk 📖
• snd_ctl_add_followers(9)
• snd_ctl_make_virtual_master(9)
• snd_ctl_add_vmaster_hook(9)
• snd_ctl_apply_vmaster_followers(9)

all the sibling functions, the whole friend group fr fr 🫶

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ngl this is a tiny one, but it's lowkey iconic — sync the followers, call the hook, bounce 🌈

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that's the whole thing, bestie! 💜 sourced from ./sound/core, dated October 2026, shipped with the Kernel API Manual — go forth and sync, you absolute queen 👑🎀🦋