snd_pcm_hw_constraint_mask(9)

📦 version 7.3.1, in nixpkgs unstable

💅 snd_pcm_hw_constraint_mask — a Kernel API Manual moment

okay so bestie, welcome to the snd_pcm_hw_constraint_mask page 💖 this one lives in the Kernel API Manual and honestly? it's giving "small function, big responsibilities." let's get into it ✨

🌸 NAME 🌸

snd_pcm_hw_constraint_mask — applies the given bitmap mask constraint, periodt 💅

🎀 SYNOPSIS 🎀

int snd_pcm_hw_constraint_mask (struct snd_pcm_runtime *runtime ,
snd_pcm_hw_param_t var , u_int32_t mask );

no cap, that's the whole signature 🫶

✨ ARGUMENTS ✨

  • runtime — the PCM runtime instance, aka the main character of this whole situation 👑
  • var — the hw_params variable you're slapping the mask onto 🌸
  • mask — the bitmap mask itself, the moment we've all been waiting for 💫

🦋 DESCRIPTION 🦋

so what does it actually do, you ask? it applies the constraint of the given bitmap mask to a 32-bit mask parameter. that's it, that's the vibe 🌈

🔥 RETURN 🔥

  • returns zero if everything slayed ✨
  • returns a negative error code on failure 😭 (yeah, it can absolutely go wrong, stay humble)

🌟 SEE ALSO 🌟

the kernel file lives at ./sound/core/pcm_lib.c, and here's the whole friend group, fr fr 🫶

okay that's the whole page, and before you go — cute little sign-off time 🧚 this one's filed under ./sound/core, dated October 2026, and it's snd_pcm_hw_constraint_mask(9) all the way down 💜 go forth and constrain those masks, bestie, iykyk 💅✨

📦 where this page comes from