Minor markup tweaks (Sy instead of Nm).
first round of POSIX 2008 stuff

@@ -1,103 +1,150 @@
-'\" te
 .\"  Copyright 1989 AT&T  Copyright (c) 2001, Sun Microsystems, Inc.  All Rights Reserved  Portions Copyright (c) 1992, X/Open Company Limited  All Rights Reserved
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-.TH GETCONTEXT 2 "Feb 5, 2001"
-.SH NAME
-getcontext, setcontext \- get and set current user context
-.SH SYNOPSIS
-.LP
-.nf
-#include <ucontext.h>
-
-\fBint\fR \fBgetcontext\fR(\fBucontext_t *\fR\fIucp\fR);
-.fi
-
-.LP
-.nf
-\fBint\fR \fBsetcontext\fR(\fBconst ucontext_t *\fR\fIucp\fR);
-.fi
-
-.SH DESCRIPTION
-.sp
-.LP
-The \fBgetcontext()\fR function initializes the structure pointed to by
-\fIucp\fR to the current user context of the calling process.  The
-\fBucontext_t\fR type that \fIucp\fR points to defines the user context and
+.Dd "Jul 20, 2014"
+.Dt GETCONTEXT 2
+.Os
+.Sh NAME
+.Nm getcontext, setcontext
+.Nd get and set current user context
+.Sh SYNOPSIS
+.In ucontext.h
+.Ft int
+.Fn getcontext "ucontext_t *ucp"
+.Ft int
+.Fn setcontext "const ucontext_t *ucp"
+.Sh DESCRIPTION
+The
+.Fn getcontext
+function initializes the structure pointed to by
+.Fa ucp
+to the current user context of the calling process.  The
+.Fa ucontext_t
+type that
+.Fa ucp
+points to defines the user context and
 includes the contents of the calling process' machine registers, the signal
 mask, and the current execution stack.
-.sp
-.LP
-The \fBsetcontext()\fR function restores the user context pointed to by
-\fIucp\fR.  A successful call to \fBsetcontext()\fR does not return; program
-execution resumes at the point specified by the \fIucp\fR argument passed to
-\fBsetcontext()\fR. The \fIucp\fR argument should be created either by a prior
-call to \fBgetcontext()\fR, or by being passed as an argument to a signal
-handler. If the \fIucp\fR argument was created with \fBgetcontext()\fR, program
-execution continues as if the corresponding call of \fBgetcontext()\fR had just
-returned.  If the \fIucp\fR argument was created with \fBmakecontext\fR(3C),
-program execution continues with the function passed to \fBmakecontext\fR(3C).
+.Lp
+The
+.Fn setcontext
+function restores the user context pointed to by
+.Fa ucp .
+A successful call to
+.Fn setcontext
+does not return; program
+execution resumes at the point specified by the
+.Fa ucp
+argument passed to
+.Fn setcontext .
+The
+.Fa ucp
+argument should be created either by a prior
+call to
+.Fn getcontext ,
+or by being passed as an argument to a signal
+handler.
+.Lp
+If the
+.Fa ucp
+argument was created with
+.Fn getcontext ,
+program execution continues as if the corresponding call of
+.Fn getcontext
+had just returned.
+.Lp
+If the
+.Fa ucp
+argument was created with
+.Xr makecontext 3C ,
+program execution continues with the function passed to
+.Xr makecontext 3C .
 When that function returns, the process continues as if after a call to
-\fBsetcontext()\fR with the \fIucp\fR argument that was input to
-\fBmakecontext\fR(3C). If the \fIucp\fR argument was passed to a signal
+.Fn setcontext
+with the
+.Fa ucp
+argument that was input to
+.Xr makecontext 3C .
+.Lp
+If the
+.Fa ucp
+argument was passed to a signal
 handler, program execution continues with the program instruction following the
-instruction interrupted by the signal.  If the \fBuc_link\fR member of the
-\fBucontext_t\fR structure pointed to by the \fIucp\fR argument is equal to 0,
+instruction interrupted by the signal.
+.Lp
+If the
+.Fa uc_link
+member of the
+.Ft ucontext_t
+structure pointed to by the
+.Fa ucp
+argument is equal to 0,
 then this context is the main context, and the process will exit when this
-context returns.  The effects of passing a \fIucp\fR argument obtained from any
-other source are unspecified.
-.SH RETURN VALUES
-.sp
-.LP
-On successful completion, \fBsetcontext()\fR does not return and
-\fBgetcontext()\fR returns \fB0\fR. Otherwise, \fB\(mi1\fR is returned.
-.SH ERRORS
-.sp
-.LP
+context returns.  The effects of passing a
+.Fa ucp
+argument obtained from any other source are unspecified.
+.Sh RETURN VALUES
+On successful completion,
+.Fn setcontext
+does not return and
+.Fn getcontext()
+returns 0. Otherwise, -1 is returned.
+.Sh ERRORS
 No errors are defined.
-.SH USAGE
-.sp
-.LP
+.Sh USAGE
 When a signal handler is executed, the current user context is saved and a new
 context is created.  If the thread leaves the signal handler via
-\fBlongjmp\fR(3UCB), then it is unspecified whether the context at the time of
-the corresponding \fBsetjmp\fR(3UCB) call is restored and thus whether future
-calls to \fBgetcontext()\fR will provide an accurate representation of the
-current context, since the context restored by \fBlongjmp\fR(3UCB) may not
-contain all the information that \fBsetcontext()\fR requires.  Signal handlers
-should use \fBsiglongjmp\fR(3C) instead.
-.sp
-.LP
-Portable applications should not modify or access the \fBuc_mcontext\fR member
-of \fBucontext_t\fR.  A portable application cannot assume that context
-includes any process-wide static data, possibly including \fBerrno\fR. Users
-manipulating contexts should take care to handle these explicitly when
+.Xr longjmp 3C ,
+then it is unspecified whether the context at the time of
+the corresponding
+.Xr setjmp 3C
+call is restored and thus whether future
+calls to
+.Fn getcontext
+will provide an accurate representation of the
+current context, since the context restored by
+.Xr longjmp 3C
+may not contain all the information that
+.Fn setcontext
+requires.  Signal handlers
+should use
+.Xr siglongjmp 3C
+instead.
+.Lp
+Portable applications should not modify or access the
+.Fa uc_mcontext
+member
+of
+.Ft ucontext_t .
+A portable application cannot assume that context
+includes any process-wide static data, possibly including
+.Va errno .
+Users manipulating contexts should take care to handle these explicitly when
 required.
-.SH ATTRIBUTES
-.sp
-.LP
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE  ATTRIBUTE VALUE
-_
-Interface Stability     Standard
-.TE
-
-.SH SEE ALSO
-.sp
-.LP
-\fBsigaction\fR(2), \fBsigaltstack\fR(2), \fBsigprocmask\fR(2),
-\fBbsd_signal\fR(3C), \fBmakecontext\fR(3C), \fBsetjmp\fR(3UCB),
-\fBsigsetjmp\fR(3C), \fBucontext.h\fR(3HEAD), \fBattributes\fR(5),
-\fBstandards\fR(5)
+.Lp
+Portable applications should make use of the
+.Xr pthreads 5
+routines for co-processing instead of these routines.
+.Sh INTERFACE STABILITY
+.Sy Obsolete Standard .
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigaltstack 2 ,
+.Xr sigprocmask 2 ,
+.Xr bsd_signal 3C ,
+.Xr makecontext 3C ,
+.Xr setjmp 3C ,
+.Xr sigsetjmp 3C ,
+.Xr ucontext.h 3HEAD ,
+.Xr pthreads 5 ,
+.Xr standards 5
+.Sh STANDARDS
+These routines were introduced in
+.St -xpg4.2
+and subsequently removed in
+.St -p1003.1-2008 .