<ucontext.h>(P) POSIX Programmer's Manual <ucontext.h>(P)
ucontext.h - user context
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
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.
<signal.h> , the System Interfaces volume of IEEE Std 1003.1-2001, getcontext(), makecon-
text(), sigaction(), sigprocmask(), sigaltstack()
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)