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 .