comedi_range_is_external(9)

✨ comedi_range_is_external ✨

okay bestie, welcome to the Kernel API Manual page for comedi_range_is_external(9) — we’re doing kernel-range vibes today and honestly it’s giving “tiny helper function with main character energy.” 💅

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🌸 NAME 🌸

comedi_range_is_external — Test if subdevice range is external.

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🎀 SYNOPSIS 🎀

bool comedi_range_is_external (struct comedi_subdevice *s , unsigned int
       range );

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🦋 ARGUMENTS 🦋

• s — COMEDI subdevice. that’s the subdevice we’re checking, bestie.
• range — Index of range within a range table. just the lil index, no cap.

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🌈 DESCRIPTION 🌈

So the way this works: it tests whether a range is externally referenced by checking whether its RF_EXTERNAL flag is set. iconic flag behavior, honestly. ⭐

It assumes range is valid — like, don’t come for this function with a bad index, okay? 🙈

Also important: this does not work for subdevices using a channel-specific range table list. noted. lowkey crucial. 💀

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💖 RETURN 💖

true if the range is external. false if the range is internal. simple, clean, slay. ✨

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/comedi/comedidev.h
• struct comedi_subdevice(9)
• struct comedi_buf_page(9)
• struct comedi_buf_map(9)
• struct comedi_async(9)
• enum comedi_cb(9)
• struct comedi_driver(9)
• struct comedi_device(9)
• struct comedi_lrange(9)
• comedi_range_is_bipolar(9)
• comedi_range_is_unipolar(9)
• comedi_chan_range_is_bipolar(9)
• comedi_chan_range_is_unipolar(9)
• comedi_chan_range_is_external(9)
• comedi_offset_munge(9)
• comedi_bytes_per_sample(9)
• comedi_sample_shift(9)
• comedi_bytes_to_samples(9)
• comedi_samples_to_bytes(9)
• comedi_check_trigger_src(9)
• comedi_check_trigger_is_unique(9)
• comedi_check_trigger_arg_is(9)
• comedi_check_trigger_arg_min(9)
• comedi_check_trigger_arg_max(9)
• comedi_buf_n_bytes_ready(9)
• __comedi_request_region(9)
• comedi_request_region(9)
• module_comedi_driver(9)

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that’s the whole page, bestie 🫶 source/version is ./include/linux/comedi, and it’s dated October 2026 — periodt. 💜