ENUM P9_OPEN_MODE_T(9)

🌸 ENUM P9_OPEN_MODE_T(9) 🌸

okay so bestie, welcome to the Kernel API Manual page for enum p9_open_mode_t — it's the 9P open modes, and it's genuinely so much cuter than it sounds, i promise 🫶

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✨ NAME ✨

enum p9_open_mode_t — the 9P open modes 💅

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🦋 SYNOPSIS 🦋

enum p9_open_mode_t {
    P9_OREAD ,
    P9_OWRITE ,
    P9_ORDWR ,
    P9_OEXEC ,
    P9_OTRUNC ,
    P9_OREXEC ,
    P9_ORCLOSE ,
    P9_OAPPEND ,
    P9_OEXCL ,
    P9L_MODE_MASK ,
    P9L_DIRECT ,
    P9L_NOWRITECACHE ,
    P9L_LOOSE

};

like, that's the whole squad right there ⭐

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🎀 Constants 🎀

• P9_OREAD — open the file for reading only 📖
• P9_OWRITE — open the file for writing only ✍️
• P9_ORDWR — open the file for reading or writing, flexible icon energy 🔥
• P9_OEXEC — open the file for execution 🏃‍♀️
• P9_OTRUNC — truncate the file to zero-length before opening it, so it's giving fresh start 😭
• P9_OREXEC — close the file when an exec(2) system call is made 🫶
• P9_ORCLOSE — remove the file when the file is closed, lowkey dramatic 💀
• P9_OAPPEND — open the file and seek to the end 📍
• P9_OEXCL — only create a file, do not open it, boundaries periodt ✋
• P9L_MODE_MASK — mask for protocol mode bits (client-side only) 🎭
• P9L_DIRECT — disable client-side caching for this file, no cap 🚫
• P9L_NOWRITECACHE — disable write caching for this file 📝
• P9L_LOOSE — enable loose cache consistency 🧚

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💖 Description 💖

so here's the tea ☕ — 9P open modes differ slightly from the Posix standard modes. not a huge deal, just a lil vibe check that didn't fully match 👑

in particular, there are extra modes which specify different semantic behaviors than may be available on standard Posix systems. for example, P9_OREXEC and P9_ORCLOSE are modes that most likely will not be issued from the Linux VFS client, but may be supported by servers 🖥️✨

See Also: http://plan9.bell-labs.com/magic/man2html/2/open 🔗

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🌈 SEE ALSO 🌈

• Kernel file ./include/net/9p/9p.h
• enum p9_debug_flags(9)
• enum p9_msg_t(9)
• enum p9_perm_t(9)
• enum p9_qid_t(9)
• struct p9_qid(9)
• struct p9_wstat(9)
• struct p9_iattr_dotl(9)
• struct p9_fcall(9)

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bestie disclaimer 💜 — the semantic caveats are real, so don't go assuming these all behave exactly like your fave Posix flags, mwah 💋

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and that's the whole page, you ate that 🍓 sign-off time: this lil masterpiece lives in ./include/net/9p, dated October 2026, and it's enum p9_open_mode_t(9) — iconic, no notes 👑💅