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:
Ft int
getcontext (ucontext_t * ;);
Ft int
setcontext (const ucontext_t * ;);
Ft void
makecontext (ucontext_t * void lp]*rp]lp]voidrp] int ... ;);
