+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ Except as noted, these functions return the integer <STRONG>ERR</STRONG> upon failure
+ and <STRONG>OK</STRONG> on success. They will fail if either of the dimensions are less
+ than or equal to zero, or if an error occurs while (re)allocating mem-
+ ory for the windows.
+
+
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ While these functions are intended to be used to support a signal han-
+ dler (i.e., for <STRONG>SIGWINCH</STRONG>), care should be taken to avoid invoking them
+ in a context where <STRONG>malloc</STRONG> or <STRONG>realloc</STRONG> may have been interrupted, since
+ it uses those functions.
+
+ If ncurses is configured to supply its own <STRONG>SIGWINCH</STRONG> handler,
+
+ <STRONG>o</STRONG> on receipt of a <STRONG>SIGWINCH</STRONG>, the handler sets a flag
+
+ <STRONG>o</STRONG> which is tested in <STRONG><A HREF="curs_getch.3x.html">wgetch(3x)</A></STRONG> and <STRONG>doupdate</STRONG>,
+
+ <STRONG>o</STRONG> in turn, calling the <STRONG>resizeterm</STRONG> function,
+
+ <STRONG>o</STRONG> which <STRONG>ungetch</STRONG>'s a <STRONG>KEY_RESIZE</STRONG> which will be read on the next call to
+ <STRONG>wgetch</STRONG>.
+
+ The <STRONG>KEY_RESIZE</STRONG> alerts an application that the screen size has
+ changed, and that it should repaint special features such as pads
+ that cannot be done automatically.
+
+ Calling <STRONG>resizeterm</STRONG> or <STRONG>resize_term</STRONG> directly from a signal handler is
+ unsafe. This indirect method is used to provide a safe way to
+ resize the ncurses data structures.
+
+ If the environment variables <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set, this overrides
+ the library's use of the window size obtained from the operating sys-
+ tem. Thus, even if a <STRONG>SIGWINCH</STRONG> is received, no screen size change may
+ be recorded.
+
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ It is possible to resize the screen with SVr4 curses, by
+
+ <STRONG>o</STRONG> exiting curses with <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG> and
+
+ <STRONG>o</STRONG> resuming using <STRONG><A HREF="curs_refresh.3x.html">refresh(3x)</A></STRONG>.
+
+ Doing that clears the screen and is visually distracting.
+
+ This extension of ncurses was introduced in mid-1995. It was adopted
+ in NetBSD curses (2001) and PDCurses (2003).
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG><A HREF="wresize.3x.html">wresize(3x)</A></STRONG>.
+
+
+</PRE><H2><a name="h2-AUTHOR">AUTHOR</a></H2><PRE>
+ Thomas Dickey (from an equivalent function written in 1988 for BSD
+ curses).
projects / ncurses.git / blobdiff