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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(), 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 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 original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .