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signal frame

The block the kernel pushes on a program's stack before running its signal handler, holding the interrupted registers so the program can carry on afterwards.

A signal frame holds the saved user context (ucontext_t with registers, signal mask, faulting address in siginfo_t) and a return path to a sigreturn trampoline; the kernel builds it on the user stack (or the alternate signal stack) and restores from it on sigreturn.

See also

faulting address bit mask carry
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