ucontext.h

<ucontext.h>(P)						      <ucontext.h>(P)



NAME
       ucontext.h - user context

SYNOPSIS
       #include <ucontext.h>

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

       The <ucontext.h> header shall define the ucontext_t type as  a  struc-
       ture 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(), makecontext(), 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 Technol-
       ogy -- 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  original  Standard  can be
       obtained online at http://www.opengroup.org/unix/online.html .



POSIX				     2003		      <ucontext.h>(P)