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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<ucontext.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <ucontext.h> 
+.SH NAME
+ucontext.h \- user context
+.SH SYNOPSIS
+.LP
+\fB#include <ucontext.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<ucontext.h>\fP header shall define the \fBmcontext_t\fP type
+through \fBtypedef\fP.
+.LP
+The \fI<ucontext.h>\fP header shall define the \fBucontext_t\fP type
+as a structure that shall include at least the
+following members:
+.sp
+.RS
+.nf
+
+\fBucontext_t *uc_link    \fP Pointer to the context that is resumed \fB
+                       \fP when this context returns. \fB
+sigset_t    uc_sigmask \fP The set of signals that are blocked when this \fB
+                       \fP context is active. \fB
+stack_t     uc_stack   \fP The stack used by this context. \fB
+mcontext_t  uc_mcontext\fP A machine-specific representation of the saved \fB
+                       \fP context. \fB
+\fP
+.fi
+.RE
+.LP
+The types \fBsigset_t\fP and \fBstack_t\fP shall be defined as in
+\fI<signal.h>\fP .
+.LP
+The following shall be declared as functions and may also be defined
+as macros, Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBint  getcontext(ucontext_t *);
+int  setcontext(const ucontext_t *);
+void makecontext(ucontext_t *, void (*)(void), int, ...);
+int  swapcontext(ucontext_t *restrict, const ucontext_t *restrict);
+\fP
+.fi
+.RE
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<signal.h>\fP , the System Interfaces volume of IEEE\ Std\ 1003.1-2001,
+\fIgetcontext\fP(), \fImakecontext\fP(), \fIsigaction\fP(), \fIsigprocmask\fP(),
+\fIsigaltstack\fP()
+.SH 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 .