UCONTEXT(5-SVR4)    RISC/os Reference Manual     UCONTEXT(5-SVR4)



NAME
     ucontext - user context

SYNOPSIS
     #include <ucontext.h>

DESCRIPTION
     The ucontext structure defines the context of a thread of
     control within an executing process.

     This structure includes at least the following members:

          ucontext_t     uc_link
          sigset_t       uc_sigmask
          stack_t        uc_stack
          mcontext_t     uc_mcontext

     uc_link is a pointer to the context that 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.

     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 applica-
     tions should not modify or access uc_mcontext.

SEE ALSO
     getcontext(2), sigaction(2), sigprocmask(2), sigaltstack(2),
     makecontext(3C).




















                        Printed 11/19/92                   Page 1