ccw_device_is_pathgroup(9)

💅 ccw_device_is_pathgroup — bestie edition

okay so this is a page from the Kernel API Manual (yes, the kernel has a manual, and yes it's kind of iconic) and it's all about one tiny little function that answers one tiny little question: are this device's paths grouped or not? let's get into it 🫶

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✨ NAME ✨

ccw_device_is_pathgroup — figure out whether the paths to this device are grouped or not 🦋

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✨ SYNOPSIS ✨

int ccw_device_is_pathgroup (struct ccw_device *cdev );

like, that's the whole thing. one function, one argument, one int coming back at you 💖

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✨ ARGUMENTS ✨

• cdev — the ccw device, aka the main character of this whole operation 👑

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✨ DESCRIPTION ✨

so here's the tea: this function returns non-zero if there is a path group, and zero otherwise. that's it. that's the vibe check 💅 no cap, it's that simple — it just tells you whether the paths are grouped, and you take that answer and go live your life 🌈

lowkey obsessed with how a whole manpage exists for a function this chill. but that's the kernel for you ✨

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✨ SEE ALSO ✨

bestie, there is a whole squad of related functions, and honestly they all deserve their moment, so here they are in all their glory 🎀

first up, the actual source file this lives in:

• Kernel file ./drivers/s390/cio/device_ops.c 👀

and now the extended friend group:

• ccw_device_set_options_mask(9), ccw_device_set_options(9), ccw_device_clear_options(9), ccw_device_is_multipath(9), ccw_device_clear(9), ccw_device_start_timeout_key(9), ccw_device_start_key(9), ccw_device_start(9), ccw_device_start_timeout(9), ccw_device_halt(9), ccw_device_resume(9), ccw_device_get_ciw(9), ccw_device_get_path_mask(9), ccw_device_get_chp_desc(9), ccw_device_get_util_str(9), ccw_device_get_id(9), ccw_device_tm_start_timeout_key(9), ccw_device_tm_start_key(9), ccw_device_tm_start(9), ccw_device_tm_start_timeout(9), ccw_device_get_mdc(9), ccw_device_tm_intrg(9), ccw_device_get_schid(9), ccw_device_pnso(9), ccw_device_get_cssid(9), ccw_device_get_iid(9), ccw_device_get_chpid(9), ccw_device_get_chid(9)

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and that's the whole page, bestie 💖 shoutout to the ./drivers/s390/cio crew for holding it down, dated October 2026 — fr fr, they ate with this one 🍓✨🎀