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<ucontext.h>(P) 		    POSIX Programmer's Manual			  <ucontext.h>(P)

NAME
       ucontext.h - user context

SYNOPSIS
       #include <ucontext.h>

DESCRIPTION
       The <ucontext.h> header shall define the mcontext_t type through typedef.

       The <ucontext.h> header shall define the ucontext_t type as a structure that shall include
       at least the following members:

	      ucontext_t *uc_link     Pointer to the context that is resumed
				      when this context returns.
	      sigset_t	  uc_sigmask  The set of signals that are blocked when this
				      context is active.
	      stack_t	  uc_stack    The stack used by this context.
	      mcontext_t  uc_mcontext A machine-specific representation of the saved
				      context.

       The types sigset_t and stack_t shall be defined as in <signal.h> .

       The following shall be declared as functions and may also be defined as	macros,  Function
       prototypes shall be provided.

	      int  getcontext(ucontext_t *);
	      int  setcontext(const ucontext_t *);
	      void makecontext(ucontext_t *, void (*)(void), int, ...);
	      int  swapcontext(ucontext_t *restrict, const ucontext_t *restrict);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <signal.h>  , the System Interfaces volume of IEEE Std 1003.1-2001, getcontext(), makecon-
       text(), sigaction(), sigprocmask(), sigaltstack()

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				  <ucontext.h>(P)
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