snd_pcm_stream_linked(9)

🎧 snd_pcm_stream_linked(9) — the Kernel API Manual, bestie edition 🎧

okay so picture this: it's a Kernel API Manual page, right, and today's main character is snd_pcm_stream_linked. yes we're in kernel land. yes there will be locking. no you cannot skip it. 💅

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✨ NAME ✨

snd_pcm_stream_linked — check whether the substream is linked with others

like, is this substream in a situationship with other substreams or is it single and ready to mingle? this function tells you. 🔗

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🌸 SYNOPSIS 🌸

int snd_pcm_stream_linked (struct snd_pcm_substream *substream );

that's it. that's the whole vibe. one arg, one return, no drama. ✨

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🎀 ARGUMENTS 🎀

• substream — the substream to check 👀 that's the one you're asking about. the subject of the vibe check.

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💖 RETURN 💖

returns true if the given substream is being linked with others 💫

(and by "returns true" we mean the int gives you a truthy answer — the page says true if it's linked, so if it comes back true: linked. periodt.)

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🦋 SEE ALSO 🦋

so many friends, so much lore. the kernel file lives at ./include/sound/pcm.h and honestly the whole group chat is here:

• snd_pcm_stream_lock_irqsave(9)
• snd_pcm_stream_lock_irqsave_nested(9)
• snd_pcm_group_for_each_entry(9)
• snd_pcm_running(9)
• __snd_pcm_set_state(9)
• bytes_to_samples(9)
• bytes_to_frames(9)
• samples_to_bytes(9)
• frames_to_bytes(9)
• frame_aligned(9)
• snd_pcm_lib_buffer_bytes(9)
• snd_pcm_lib_period_bytes(9)
• snd_pcm_playback_avail(9)
• snd_pcm_capture_avail(9)
• snd_pcm_playback_hw_avail(9)
• snd_pcm_capture_hw_avail(9)
• snd_pcm_playback_ready(9)
• snd_pcm_capture_ready(9)
• snd_pcm_playback_data(9)
• snd_pcm_playback_empty(9)
• snd_pcm_capture_empty(9)
• snd_pcm_trigger_done(9)
• params_channels(9)
• params_rate(9)
• params_period_size(9)
• params_periods(9)
• params_buffer_size(9)
• params_buffer_bytes(9)
• snd_pcm_hw_constraint_single(9)
• snd_pcm_format_cpu_endian(9)
• snd_pcm_set_sync(9)
• snd_pcm_set_runtime_buffer(9)
• snd_pcm_gettime(9)
• snd_pcm_set_fixed_buffer(9)
• snd_pcm_set_fixed_buffer_all(9)
• snd_pcm_sgbuf_get_addr(9)
• snd_pcm_sgbuf_get_chunk_size(9)
• snd_pcm_limit_isa_dma_size(9)
• snd_pcm_direction_name(9)
• snd_pcm_stream_str(9)
• snd_pcm_chmap_substream(9)
• pcm_format_to_bits(9)
• pcm_for_each_format(9)

no cap, that's the entire crew. tap in. 🫶

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lowkey reminder: if you're poking at substreams, read the locking friends up top first — snd_pcm_stream_lock_irqsave and snd_pcm_stream_lock_irqsave_nested are right there for a reason. iykyk. 🔒

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and that's the page, bestie!! 🎀 source lives in ./include/sound, dated October 2026 — signed, sealed, delivered, and yes the footer is serving looks. bye mwah 💜🧚‍♀️