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UCONTEXT (3) | C library functions | Unix Manual Pages | :man▋
NAME
ucontext - user thread context
CONTENTS
Library
Synopsis
Description
See Also
LIBRARY
.Lb libc
SYNOPSIS
.In ucontext.h
DESCRIPTION
The
.Vt ucontext_t type is a structure type suitable for holding the context for a user thread of execution. A thread’s context includes its stack, saved registers, and list of blocked signals. The
.Vt ucontext_t structure contains at least these fields: | "ucontext_t *uc_link" | context to assume when this one returns | | "sigset_t uc_sigmask" | signals being blocked | | "stack_t uc_stack" | stack area | | "mcontext_t uc_mcontext" | saved registers | |
The uc_link field points to the context to resume when this context’s entry point function returns. If uc_link is equal to NULL, then the process exits when this context returns. The uc_mcontext field is machine-dependent and should be treated as opaque by portable applications. The following functions are defined to manipulate
.Vt ucontext_t structures: | | int getcontext "ucontext_t *"; | | | int setcontext "const ucontext_t *"; | | | void makecontext "ucontext_t *" "void lp]*rp]lp]voidrp]" int ...; | | | int swapcontext "ucontext_t *" "const ucontext_t *"; | |
SEE ALSO
sigaltstack(2), getcontext(3), makecontext(3)
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