snd_jack_new(9)

💅 snd_jack_new(9) — the Kernel API Manual, bestie edition ✨

okay so you found a (9) page, which means it's kernel API and you're officially in the big-girl leagues now 🎀 this one lives in the Kernel API Manual, and it's about making a jack. no, not the thing in your headphones cord (well… actually yes, kinda, that's the vibe 👀). stay with me.

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✨ NAME ✨

snd_jack_new — Create a new jack 🎧✨

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🦋 SYNOPSIS 🦋

int snd_jack_new (struct snd_card *card , const char *id , int type ,
struct snd_jack **jjack , bool initial_kctl , bool phantom_jack );

like… six arguments. she's high maintenance and she's worth it 💅

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🌸 ARGUMENTS 🌸

• card — the card instance 💳 that's your sound card babe, the whole reason we're here
• id — an identifying string for this jack 🏷️ give her a name, she deserves one
• type — a bitmask of enum snd_jack_type values that can be detected by this jack 🔍 so like, what flavours of plugging-in can she even notice
• jjack — Used to provide the allocated jack object to the caller. 🫶 that's your out-param, she hands the shiny new jack back to you through this
• initial_kctl — if true, create a kcontrol and add it to the jack list. ✅ true means yes please, make the kcontrol and add it to the list
• phantom_jack — Don't create a input device for phantom jacks. 👻👑 phantom jacks don't get an input device, that's the whole point of the flag

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💖 DESCRIPTION 💖

Creates a new jack object. that's it, that's the description, she's a simple girl with a simple purpose ✨ literally just makes the jack. iconic behaviour, no notes 🎀

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🔥 RETURN 🔥

Zero if successful, or a negative error code on failure. 😭 so <0 means something went wrong, 0 means slay. and on success jjack will be initialised — so bestie please do not touch that pointer before you get the zero back, iykyk 💀

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🌈 SEE ALSO 🌈

• Kernel file ./sound/core/jack.c 📁 the source, go read it, it's giving main character energy
• snd_jack_add_new_kctl(9)
• snd_jack_set_key(9)
• snd_jack_report(9)

all your little jack besties, go say hi 🫶

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⭐ friendly reminder: negative return code = check it, don't ignore it, that's not cute 🙈

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okay that's the page!! 🧚 this one comes from the ./sound/core part of the tree, dated October 2026, and it's snd_jack_new(9) in the Kernel API Manual — go build something that goes click 🎧💜💅