ucontext - user context
The thread of control within an executing process is specified
by the ucontext structure. This structure contains
at least the following members:
The values for each member is as follows: Points to the
context that is to continue when this context returns. If
uc_link is equal to zero (0), this is the main context,
and the process exits when this context returns. Specifies
the set of signals that are blocked when this context
is active. See sigprocmask(2) for more information.
Specifies the stack used by this context. See sigaltstack(2) for more information. Contains the saved machine
registers and any implementation-specific context data.
Portable applications should not access or modify the
uc_mcontext value in the ucontext structure.
Functions: getcontext(2), sigaction(2), sigprocmask(2),
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