snd_card_rw_proc_new(9)

💅 snd_card_rw_proc_new 💅

okay so bestie, welcome to the Kernel API Manual — this one's snd_card_rw_proc_new(9) and it's literally the glow-up your sound card's proc entries have been waiting for ✨

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🎀 NAME 🎀

snd_card_rw_proc_new — makes a read/write text proc file entry for the card. that's it, that's the whole vibe 🫶

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✨ SYNOPSIS ✨

int snd_card_rw_proc_new (struct snd_card *card , const char *name ,
void *private_data , void (*read)(struct snd_info_entry *, struct
snd_info_buffer *) , void (*write)(struct snd_info_entry *entry, struct
snd_info_buffer *buffer) );

like, yes, the signature is a whole paragraph, we know 😭 but every single character matters so it stays exactly like that, no cap 💯

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🦋 ARGUMENTS 🦋

• card — the card instance, aka the main character here 👑
• name — the file name, what it's gonna be called, cute and simple 🌸
• private_data — the arbitrary private data, your little stash of whatever you need, zero judgement 🙈
• read — the read callback, runs when someone reads the file 📖
• write — the write callback, and ngl if you pass NULL here the file is read-only, which is honestly a valid lifestyle 💅

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🌈 DESCRIPTION 🌈

so here's the tea: this proc file entry gets registered via the snd_card_register call, and — plot twist — it also gets removed automatically at card removal. so you don't have to do the cleanup yourself, it handles that. iconic behavior fr fr ✨

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⭐ RETURN ⭐

zero if it works out 😌 — or a negative error code if it doesn't 💀

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🔥 SEE ALSO 🔥

• Kernel file ./sound/core/info.c
• snd_info_get_line(9)
• snd_info_get_str(9)
• snd_info_create_module_entry(9)
• snd_info_create_card_entry(9)
• snd_info_free_entry(9)
• snd_info_register(9)

like, go read those too bestie, iykyk 🧚

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ok that's the whole page!! eat it up, use it responsibly, and remember: the write callback being NULL = read-only, no take-backsies 🍓

mwah 💖 this was snd_card_rw_proc_new(9) from the ./sound/core girlies, dated October 2026 — catch you in the next one, periodt 💜