ncurses 5.9 - patch 20111217

[ncurses.git] / man / curs_kernel.3x

diff --git a/man/curs_kernel.3x b/man/curs_kernel.3x
index 62a775e7cbed85e0a17857c0a3639a110f287988..d81b134b8d8196482b26da942558f0937d29688b 100644 (file)
--- a/man/curs_kernel.3x
+++ b/man/curs_kernel.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright (c) 1998 Free Software Foundation, Inc.                        *
+.\" Copyright (c) 1998-2005,2010 Free Software Foundation, Inc.                        *

 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *


@@ -26,16 +26,27 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_kernel.3x,v 1.11 1998/06/27 21:56:38 tom Exp $
+.\" $Id: curs_kernel.3x,v 1.19 2010/12/04 18:38:55 tom Exp $

 .TH curs_kernel 3X ""
 .TH curs_kernel 3X ""

+.na
+.hy 0

 .SH NAME
 .SH NAME

-\fBdef_prog_mode\fR, \fBdef_shell_mode\fR,
-\fBreset_prog_mode\fR, \fBreset_shell_mode\fR, \fBresetty\fR,
-\fBsavetty\fR, \fBgetsyx\fR, \fBsetsyx\fR, \fBripoffline\fR,
-\fBcurs_set\fR, \fBnapms\fR - low-level \fBcurses\fR routines
+\fBdef_prog_mode\fR,
+\fBdef_shell_mode\fR,
+\fBreset_prog_mode\fR,
+\fBreset_shell_mode\fR,
+\fBresetty\fR,
+\fBsavetty\fR,
+\fBgetsyx\fR,
+\fBsetsyx\fR,
+\fBripoffline\fR,
+\fBcurs_set\fR,
+\fBnapms\fR \- low-level \fBcurses\fR routines
+.ad
+.hy

 .SH SYNOPSIS
 \fB#include <curses.h>\fR
 .SH SYNOPSIS
 \fB#include <curses.h>\fR

-
+.sp

 \fBint def_prog_mode(void);\fR
 .br
 \fBint def_shell_mode(void);\fR
 \fBint def_prog_mode(void);\fR
 .br
 \fBint def_shell_mode(void);\fR


@@ -60,36 +71,36 @@
 .br
 .SH DESCRIPTION
 The following routines give low-level access to various \fBcurses\fR
 .br
 .SH DESCRIPTION
 The following routines give low-level access to various \fBcurses\fR

-capabilities.  Theses routines typically are used inside library
+capabilities.  These routines typically are used inside library

 routines.
 routines.

-
+.PP

 The \fBdef_prog_mode\fR and \fBdef_shell_mode\fR routines save the
 current terminal modes as the "program" (in \fBcurses\fR) or "shell"
 (not in \fBcurses\fR) state for use by the \fBreset_prog_mode\fR and
 \fBreset_shell_mode\fR routines.  This is done automatically by
 \fBinitscr\fR.  There is one such save area for each screen context
 allocated by \fBnewterm()\fR.
 The \fBdef_prog_mode\fR and \fBdef_shell_mode\fR routines save the
 current terminal modes as the "program" (in \fBcurses\fR) or "shell"
 (not in \fBcurses\fR) state for use by the \fBreset_prog_mode\fR and
 \fBreset_shell_mode\fR routines.  This is done automatically by
 \fBinitscr\fR.  There is one such save area for each screen context
 allocated by \fBnewterm()\fR.

-
+.PP

 The \fBreset_prog_mode\fR and \fBreset_shell_mode\fR routines restore
 the terminal to "program" (in \fBcurses\fR) or "shell" (out of
 \fBcurses\fR) state.  These are done automatically by \fBendwin\fR
 and, after an \fBendwin\fR, by \fBdoupdate\fR, so they normally are
 not called.
 The \fBreset_prog_mode\fR and \fBreset_shell_mode\fR routines restore
 the terminal to "program" (in \fBcurses\fR) or "shell" (out of
 \fBcurses\fR) state.  These are done automatically by \fBendwin\fR
 and, after an \fBendwin\fR, by \fBdoupdate\fR, so they normally are
 not called.

-
+.PP

 The \fBresetty\fR and \fBsavetty\fR routines save and restore the
 state of the terminal modes.  \fBsavetty\fR saves the current state in
 a buffer and \fBresetty\fR restores the state to what it was at the
 last call to \fBsavetty\fR.
 The \fBresetty\fR and \fBsavetty\fR routines save and restore the
 state of the terminal modes.  \fBsavetty\fR saves the current state in
 a buffer and \fBresetty\fR restores the state to what it was at the
 last call to \fBsavetty\fR.

-
+.PP

 The \fBgetsyx\fR routine returns the current coordinates of the virtual screen
 cursor in \fIy\fR and \fIx\fR.  If \fBleaveok\fR is currently \fBTRUE\fR, then
 The \fBgetsyx\fR routine returns the current coordinates of the virtual screen
 cursor in \fIy\fR and \fIx\fR.  If \fBleaveok\fR is currently \fBTRUE\fR, then

-\fB-1\fR,\fB-1\fR is returned.  If lines have been removed from the top of the
+\fB\-1\fR,\fB\-1\fR is returned.  If lines have been removed from the top of the

 screen, using \fBripoffline\fR, \fIy\fR and \fIx\fR include these lines;
 therefore, \fIy\fR and \fIx\fR should be used only as arguments for
 \fBsetsyx\fR.
 screen, using \fBripoffline\fR, \fIy\fR and \fIx\fR include these lines;
 therefore, \fIy\fR and \fIx\fR should be used only as arguments for
 \fBsetsyx\fR.

-
+.PP

 The \fBsetsyx\fR routine sets the virtual screen cursor to
 The \fBsetsyx\fR routine sets the virtual screen cursor to

-\fIy\fR, \fIx\fR.  If \fIy\fR and \fIx\fR are both \fB-1\fR, then
+\fIy\fR, \fIx\fR.  If \fIy\fR and \fIx\fR are both \fB\-1\fR, then

 \fBleaveok\fR is set.  The two routines \fBgetsyx\fR and \fBsetsyx\fR
 are designed to be used by a library routine, which manipulates
 \fBcurses\fR windows but does not want to change the current position
 \fBleaveok\fR is set.  The two routines \fBgetsyx\fR and \fBsetsyx\fR
 are designed to be used by a library routine, which manipulates
 \fBcurses\fR windows but does not want to change the current position


@@ -97,7 +108,7 @@ of the program's cursor.  The library routine would call \fBgetsyx\fR
 at the beginning, do its manipulation of its own windows, do a
 \fBwnoutrefresh\fR on its windows, call \fBsetsyx\fR, and then call
 \fBdoupdate\fR.
 at the beginning, do its manipulation of its own windows, do a
 \fBwnoutrefresh\fR on its windows, call \fBsetsyx\fR, and then call
 \fBdoupdate\fR.

-
+.PP

 The \fBripoffline\fR routine provides access to the same facility that
 \fBslk_init\fR [see \fBcurs_slk\fR(3X)] uses to reduce the size of the
 screen.  \fBripoffline\fR must be called before \fBinitscr\fR or
 The \fBripoffline\fR routine provides access to the same facility that
 \fBslk_init\fR [see \fBcurs_slk\fR(3X)] uses to reduce the size of the
 screen.  \fBripoffline\fR must be called before \fBinitscr\fR or


@@ -112,41 +123,63 @@ and \fBCOLS\fR (defined in \fB<curses.h>\fR) are not guaranteed to be
 accurate and \fBwrefresh\fR or \fBdoupdate\fR must not be called.  It
 is allowable to call \fBwnoutrefresh\fR during the initialization
 routine.
 accurate and \fBwrefresh\fR or \fBdoupdate\fR must not be called.  It
 is allowable to call \fBwnoutrefresh\fR during the initialization
 routine.

-
+.PP

 \fBripoffline\fR can be called up to five times before calling \fBinitscr\fR or
 \fBnewterm\fR.
 \fBripoffline\fR can be called up to five times before calling \fBinitscr\fR or
 \fBnewterm\fR.

-
-The \fBcurs_set\fR routine sets the cursor state is set to invisible,
+.PP
+The \fBcurs_set\fR routine sets the cursor state to invisible,

 normal, or very visible for \fBvisibility\fR equal to \fB0\fR,
 \fB1\fR, or \fB2\fR respectively.  If the terminal supports the
 \fIvisibility\fR requested, the previous \fIcursor\fR state is
 returned; otherwise, \fBERR\fR is returned.
 normal, or very visible for \fBvisibility\fR equal to \fB0\fR,
 \fB1\fR, or \fB2\fR respectively.  If the terminal supports the
 \fIvisibility\fR requested, the previous \fIcursor\fR state is
 returned; otherwise, \fBERR\fR is returned.

-
+.PP

 The \fBnapms\fR routine is used to sleep for \fIms\fR milliseconds.
 .SH RETURN VALUE
 Except for \fBcurs_set\fR, these routines always return \fBOK\fR.
 The \fBnapms\fR routine is used to sleep for \fIms\fR milliseconds.
 .SH RETURN VALUE
 Except for \fBcurs_set\fR, these routines always return \fBOK\fR.

-\fBcurs_set\fR returns the previous cursor state, or \fBERR\fR if the
+.PP
+\fBcurs_set\fR
+returns the previous cursor state, or \fBERR\fR if the

 requested \fIvisibility\fR is not supported.
 requested \fIvisibility\fR is not supported.

+.PP
+X/Open defines no error conditions.
+In this implementation
+.RS
+.TP 5
+\fBdef_prog_mode\fR, \fBdef_shell_mode\fR, \fBreset_prog_mode\fR, \fBreset_shell_mode\fR
+return an error
+if the terminal was not initialized, or
+if the I/O call to obtain the terminal settings fails.
+.TP 5
+\fBripoffline\fP
+returns an error if the maximum number of ripped-off lines
+exceeds the maximum (NRIPS = 5).
+.RE

 .SH NOTES
 Note that \fBgetsyx\fR is a macro, so \fB&\fR is not necessary before
 the variables \fIy\fR and \fIx\fR.
 .SH NOTES
 Note that \fBgetsyx\fR is a macro, so \fB&\fR is not necessary before
 the variables \fIy\fR and \fIx\fR.

-
+.PP

 Older SVr4 man pages warn that the return value of \fBcurs_set\fR "is currently
 incorrect".  This implementation gets it right, but it may be unwise to count
 on the correctness of the return value anywhere else.
 Older SVr4 man pages warn that the return value of \fBcurs_set\fR "is currently
 incorrect".  This implementation gets it right, but it may be unwise to count
 on the correctness of the return value anywhere else.

+.PP
+Both ncurses and SVr4 will call \fBcurs_set\fR in \fBendwin\fR
+if \fBcurs_set\fR
+has been called to make the cursor other than normal, i.e., either
+invisible or very visible.
+There is no way for ncurses to determine the initial cursor state to
+restore that.

 .SH PORTABILITY
 The functions \fBsetsyx\fR and \fBgetsyx\fR are not described in the XSI
 Curses standard, Issue 4.  All other functions are as described in XSI Curses.
 .SH PORTABILITY
 The functions \fBsetsyx\fR and \fBgetsyx\fR are not described in the XSI
 Curses standard, Issue 4.  All other functions are as described in XSI Curses.

-
+.PP

 The SVr4 documentation describes \fBsetsyx\fR and \fBgetsyx\fR as having return
 type int. This is misleading, as they are macros with no documented semantics
 for the return value.
 .SH SEE ALSO
 The SVr4 documentation describes \fBsetsyx\fR and \fBgetsyx\fR as having return
 type int. This is misleading, as they are macros with no documented semantics
 for the return value.
 .SH SEE ALSO

-\fBcurses\fR(3X), \fBcurs_initscr\fR(3X), \fBcurs_outopts\fR(3X), \fBcurs_refresh\fR(3X),
-\fBcurs_scr_dump\fR(3X), \fBcurs_slk\fR(3X)
-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
-.\"# End:
+\fBcurses\fR(3X),
+\fBcurs_initscr\fR(3X),
+\fBcurs_outopts\fR(3X),
+\fBcurs_refresh\fR(3X),
+\fBcurs_scr_dump\fR(3X),
+\fBcurs_slk\fR(3X),
+\fBcurs_variables\fR(3X).