STRUCT DCW(9)

💅 struct dcw(9) 💅

okay bestie, welcome to the struct dcw(9) page — straight out of the Kernel API Manual, and yes it's exactly as niche and iconic as it sounds ✨

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🌸 NAME 🌸

struct dcw — the Device-Command Word, aka DCW. that's the whole name, no notes, she's literally just that 💅

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🎀 SYNOPSIS 🎀

here's the look, don't touch anything, it's giving very structured:

struct dcw {
    u32 cmd:8;
    u32 flags:8;
    u32 :8;
    u32 cd_count:8;
    u32 count;
    u8 cd[];
 };

notice the third field? yeah, u32 :8; — she has no name and no description, she's just there, anonymous, living her best life 🙈 (we don't list her in Members, because the manpage doesn't, and we respect the source ✋)

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👑 Members 👑

• cmd — the Command Code 💖 can be one of DCW_CMD_WRITE, DCW_CMD_READ, DCW_CMD_CONTROL, DCW_CMD_SENSE, DCW_CMD_SENSE_ID, DCW_CMD_INTRG. pick one, bestie, and slay.
• flags — the Flags ✨ can be an arithmetic OR of DCW_FLAGS_CC. that's the whole menu, no secret items.
• cd_count — the Control-Data Count 🍓
• count — the Count 🫶 yes. that's it. that's the description. count.
• cd — the Control Data 🦋 it's an array (u8 cd[]), she's flexible, we love her.

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🌈 SEE ALSO 🌈

go touch these next, iykyk 💜

• Kernel file ./arch/s390/include/asm/fcx.h
• struct tcw(9)
• struct tidaw(9)
• struct tsa_iostat(9)
• struct tsa_intrg(9)
• struct tsb(9)
• struct dcw_intrg_data(9)
• struct tccb_tcah(9)
• struct tccb_tcat(9)
• struct tccb(9)

like… that's a whole friend group right there, go say hi 🧚

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ngl there are no options, no exit statuses, no env vars and no bug notes on this page — she's short, she's sweet, she's a struct. don't go looking for lore that isn't there 👑

mwah 💋 — this one lives in ./arch/s390/include/asm, dated October 2026, and that's the whole sign-off, periodt. 🎀