Click this button to go to the index for this section.

ucontext(5)
NAME
  ucontext - user context

SYNOPSIS
  #include <ucontext.h>





DESCRIPTION
  The thread of control within an executing process is specified by the
  ucontext structure.  This structure contains at least the following
  members:

       ucontext_t  uc_link
	      sigset_t	  uc_sigmask
	      stack_t	  uc_stack
	      mcontext_t  uc_mcontext

  The values for each member is as follows:

  uc_link
      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.

  uc_sigmask
      Specifies the set of signals that are blocked when this context is
      active.  See sigprocmask(2) for more information.

  uc_stack
      Specifies the stack used by this context.	 See sigaltstack(2) for more
      information.

  uc_mcontext
      Contains the saved machine registers and any implementation-specific
      context data.

RESTRICTIONS
  Portable applications should not access or modify the uc_mcontext value in
  the ucontext structure.








SEE ALSO
  Functions: getcontext(2), sigaction(2), sigprocmask(2), sigaltstack(2).