STRUCT SCLP_DIAG_FTP(9)

🌸 struct sclp_diag_ftp — like, the manual page for it 💅

okay bestie, so this is the kernel API manual page for struct sclp_diag_ftp — sclp_diag_ftp(9) if you're fancy 💖 — and it's literally the Diagnostic Test FTP Service model-dependent data. yes, that's a whole mouthful, but it's giving "important s390 char driver business" and we're gonna get through it together 🫶

✨ NAME ✨

struct sclp_diag_ftp — Diagnostic Test FTP Service model-dependent data 🎀

🦋 SYNOPSIS 🦋

no cap, here's the whole struct, copy-paste energy, exactly as it is:

struct sclp_diag_ftp {
    u8 pcx;
    u8 ldflg;
    u8 cmd;
    u8 pgsize;
    u8 srcflg;
    u8 spare;
    u64 offset;
    u64 fsize;
    u64 length;
    u64 failaddr;
    u64 bufaddr;
    u64 asce;
    u8 fident[256];
 };

👑 Members 👑

okay so every single member, one by one, no skipping, not even the reserved one (especially not the reserved one, she's iconic in her own quiet way) 💀

• pcx — the code for PCX communication. and it should be 0x80, like that's the vibe check it needs to pass ✨
• ldflg — the load flag. lowkey you gotta check the defines above for this one, bestie 👀
• cmd — the FTP command. yes ma'am, the actual command 🎀
• pgsize — page size, and it's a whole either/or situation: 0 = 4kB, 1 = large page size 🌈
• srcflg — source flag 🦋
• spare — reserved, and it's zeroes. literally just zeroes. she's filler and she ate 💅
• offset — file offset, off we go 📍
• fsize — file size, the whole thing 🍓
• length — buffer size resp. bytes transferred. dual-purpose queen 👑
• failaddr — failing address. when things go wrong, this is the address that did it 😭
• bufaddr — buffer address, virtual. virtual bestie, not physical, don't get it twisted 🧚
• asce — region or segment table designation. fancy name, very main character ✨
• fident — the file name, ASCII and zero-terminated, and it's 256 bytes of it, so plenty of room for your whole name and then some 💖

💜 SEE ALSO 💜

• Kernel file ./drivers/s390/char/sclp_diag.h — that's where the lore lives, go read it 📖
• struct sclp_diag_evbuf(9) 🌸
• struct sclp_diag_sccb(9) 🌸

and that's the whole page, bestie, you ate that 🫶 source is ./drivers/s390/char, dated October 2026, and it's struct sclp_diag_ftp(9) all the way down — periodt 💅✨