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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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