STRUCT UCONTEXT(9)

💖 NAME 💖

okay so bestie, this is struct ucontext — the user context structure — and we're reading the struct ucontext(9) page from the Kernel API Manual. she's giving “I hold a whole user context” energy, periodt. 💅

✨ SYNOPSIS ✨

here's the struct exactly as printed, no cap, no edits:

struct ucontext {
    unsigned long           uc_flags;
    struct ucontext         *uc_link;
    stack_t uc_stack;
    struct sigcontext       uc_mcontext;
    sigset_t uc_sigmask;
    unsigned long long      uc_extcontext[];
 };

🫶 Members 🫶

vibe check on the members, in the same order the page gives them:

• uc_flags — the flags member. the page lists it with no extra description, so that's the whole tea. 🍵
• uc_link — the link member, listed with no extra description either. 🫶
• uc_stack — the stack member, named and not elaborated on. 🌸
• uc_mcontext — holds basic processor state ✨ (that's the actual note, bestie).
• uc_sigmask — the signal mask member, listed with no extra description. 💜
• uc_extcontext — holds extended processor state 🔥 (again, that's the note).

🌈 SEE ALSO 🌈

• Kernel file ./arch/mips/include/uapi/asm/ucontext.h struct extcontext(9), struct msa_extcontext(9) — go look, iykyk 👀

xoxo, your kernel bestie 💖 — source/version: ./arch/mips/include/uapi/asm; date: October 2026; page: struct ucontext(9). byeee 👑