scsw_cmd_is_valid_stctl(9)

📦 version 7.3.1, in nixpkgs unstable

💅 scsw_cmd_is_valid_stctl — check stctl field validity

okay so real talk bestie, we're deep in the Kernel API Manual today and this one is scsw_cmd_is_valid_stctl(9) — yes the name is a mouthful, no you cannot abbreviate it, we do not do that here 🫶

✨ NAME ✨

scsw_cmd_is_valid_stctl — bestie, this is the little guy that checks whether the stctl field is valid 👑

🌸 SYNOPSIS 🌸

int scsw_cmd_is_valid_stctl (union scsw *scsw );

that's it. that's the whole vibe. one function, one pointer, zero drama ✨

🎀 ARGUMENTS 🎀

  • scsw — a pointer to an scsw, literally just a pointer to scsw, that's the whole argument, that's her 💅

🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — this function returns non-zero if the stctl field of the specified command mode scsw is valid, and zero otherwise. that's it. that's the whole function. it's giving very much a yes/no girlie and honestly? iconic 👑

so like, non-zero = valid ✅, zero = not valid ❌. no cap, that's the entire contract. don't overthink her, she's doing her job 🧚

🌈 SEE ALSO 🌈

bestie there are SO many of these, and I mean SO many, so buckle up — this is the whole family reunion and everyone showed up 💀

first up, the kernel file where all of this lives:

  • ./arch/s390/include/asm/scsw.h

and now, in order, the entire guest list 🎟️

like I said. everyone. the whole friend group, the whole extended family, the whole group chat 🫶 iykyk 💜

and that's the page bestie, written from the ./arch/s390/include/asm of it all, dated October 2026 — go read the source, slay your kernel work, and remember: non-zero means valid, zero means nope, periodt 💅✨🎀

📦 where this page comes from