ucontext - user context
The ucontext structure defines the context of a thread of control within
an executing process.
This structure includes at least the following members:
uc_link is a pointer to the context that is to be resumed when this
context returns. If uc_link is equal to 0, then this context is the main
context, and the process exits when this context returns. The uc_link
field is only meaningful for contexts created using makecontext.
uc_sigmask defines the set of signals that are blocked when this context
is active (see sigprocmask(2)).
uc_stack defines the stack used by this context (see sigaltstack(2)).
uc_mcontext contains the saved set of machine registers and any
implementation specific context data. Portable applications should not
modify or access uc_mcontext.
getcontext(2), sigaction(2), sigaltstack(2), sigprocmask(2),
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