sync code with last improvements from OpenBSD

lib/libX11/man/XDefineCursor.man

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+.\" Tektronix, Inc.
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+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xW Athena X Widgets \- C Language X Toolkit Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.TH XDefineCursor __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
+.SH NAME
+XDefineCursor, XUndefineCursor \- define cursors
+.SH SYNTAX
+.HP
+int XDefineCursor\^(\^Display *\fIdisplay\fP\^, Window \fIw\fP\^, Cursor
+\fIcursor\fP\^);
+.HP
+int XUndefineCursor\^(\^Display *\fIdisplay\fP\^, Window \fIw\fP\^);
+.SH ARGUMENTS
+.IP \fIcursor\fP 1i
+Specifies the cursor that is to be displayed or
+.BR None .
+.IP \fIdisplay\fP 1i
+Specifies the connection to the X server.
+.IP \fIw\fP 1i
+Specifies the window.
+.SH DESCRIPTION
+If a cursor is set, it will be used when the pointer is in the window.
+If the cursor is
+.BR None ,
+it is equivalent to
+.BR XUndefineCursor .
+.LP
+.B XDefineCursor
+can generate
+.B BadCursor
+and
+.B BadWindow
+errors.
+.LP
+The
+.B XUndefineCursor
+function undoes the effect of a previous
+.B XDefineCursor
+for this window.
+When the pointer is in the window,
+the parent's cursor will now be used.
+On the root window,
+the default cursor is restored.
+.LP
+.B XUndefineCursor
+can generate a
+.B BadWindow
+error.
+.SH DIAGNOSTICS
+.TP 1i
+.B BadAlloc
+The server failed to allocate the requested resource or server memory.
+.TP 1i
+.B BadCursor
+A value for a Cursor argument does not name a defined Cursor.
+.TP 1i
+.B BadWindow
+A value for a Window argument does not name a defined Window.
+.SH "SEE ALSO"
+XCreateFontCursor(__libmansuffix__),
+XRecolorCursor(__libmansuffix__)
+.br
+\fI\*(xL\fP