snd_interval_ratnum(9)

✨ snd_interval_ratnum(9) — the Kernel API Manual, but make it make sense ✨

okay bestie, we're in the Kernel API Manual today and the star of the show is snd_interval_ratnum(9). yes it's a mouthful. yes it's important. let's get into it 💅

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💖 NAME 💖

snd_interval_ratnum — refine the interval value

like, it takes an interval and makes it more precise. it's giving glow-up for numbers. ✨

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🎀 SYNOPSIS 🎀

int snd_interval_ratnum (struct snd_interval *i , unsigned int
rats_count , const struct snd_ratnum *rats , unsigned int *nump ,
unsigned int *denp );

she returns an int, she takes five things, she's booked and busy. no cap. 🦋

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🌸 ARGUMENTS 🌸

• i — the interval to refine. this is the main character of the whole function fr fr, she's the one getting refined 💖
• rats_count — number of ratnum_t. yes, that's how many of them there are. yes, the name is silly. we love her anyway 🙈
• rats — the ratnum_t array. this is where the ratnums live 🐀✨
• nump — pointer to store the resultant numerator. she's an out-param, so the function writes into her 💅
• denp — pointer to store the resultant denominator. same vibe, different half of the fraction 🎀

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🔥 RETURN 🔥

three possible moods, bestie:

• Positive — if the value is changed (slay, she did something 💫)
• Zero — if it's not changed (no notes, nothing happened, iconic stillness 😌)
• A negative error code — something went wrong, and she's telling you about it 😭

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🫶 SEE ALSO 🫶

buckle up buttercup, this is a long list — every single one of these is invited to the group chat:

Kernel file ./sound/core/pcm_lib.c, plus:

• snd_pcm_set_ops(9)
• snd_pcm_set_sync_per_card(9)
• snd_interval_refine(9)
• snd_interval_div(9)
• snd_interval_muldivk(9)
• snd_interval_mulkdiv(9)
• snd_interval_ratden(9)
• snd_interval_list(9)
• snd_interval_ranges(9)
• snd_pcm_hw_rule_add(9)
• snd_pcm_hw_constraint_mask(9)
• snd_pcm_hw_constraint_mask64(9)
• snd_pcm_hw_constraint_integer(9)
• snd_pcm_hw_constraint_minmax(9)
• snd_pcm_hw_constraint_list(9)
• snd_pcm_hw_constraint_ranges(9)
• snd_pcm_hw_constraint_ratnums(9)
• snd_pcm_hw_constraint_ratdens(9)
• snd_pcm_hw_constraint_msbits(9)
• snd_pcm_hw_constraint_step(9)
• snd_pcm_hw_constraint_pow2(9)
• snd_pcm_hw_rule_noresample(9)
• snd_pcm_hw_param_value(9)
• snd_pcm_hw_param_first(9)
• snd_pcm_hw_param_last(9)
• snd_pcm_hw_params_bits(9)
• snd_pcm_lib_ioctl(9)
• snd_pcm_period_elapsed_under_stream_lock(9)
• snd_pcm_period_elapsed(9)
• snd_pcm_add_chmap_ctls(9)

ngl that's a whole friend group. iykyk 💀

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reminder bestie: this is kernel API territory, so read the whole thing before you go poking at intervals. she's a real function with real out-params and you will be judged by the compiler 🌈

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and that's the page!! mwah 💜 this lil writeup comes to you from ./sound/core, dated October 2026 — see you in the next one, bestie 🎀✨