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* @Id: curs_memleaks.3x,v 1.35 2024/03/16 15:35:01 tom Exp @
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<HTML>
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<HEAD>
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
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<TITLE>curs_memleaks 3x 2024-03-16 ncurses 6.6 Library calls</TITLE>
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<link rel="author" href="mailto:bug-ncurses@gnu.org">
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</HEAD>
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<BODY>
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<H1 class="no-header">curs_memleaks 3x 2024-03-16 ncurses 6.6 Library calls</H1>
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<PRE>
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<STRONG><A HREF="curs_memleaks.3x.html">curs_memleaks(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_memleaks.3x.html">curs_memleaks(3x)</A></STRONG>
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</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
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<STRONG>exit_curses</STRONG>, <STRONG>exit_terminfo</STRONG> - check for memory leaks in <EM>curses</EM>
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</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
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<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
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<STRONG>void</STRONG> <STRONG>exit_curses(int</STRONG> <EM>code</EM><STRONG>);</STRONG>
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<STRONG>#include</STRONG> <STRONG><term.h></STRONG>
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<STRONG>void</STRONG> <STRONG>exit_terminfo(int</STRONG> <EM>code</EM><STRONG>);</STRONG>
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<EM>/*</EM> <EM>deprecated</EM> <EM>(intentionally</EM> <EM>not</EM> <EM>declared</EM> <EM>in</EM> <EM>curses.h</EM> <EM>or</EM> <EM>term.h)</EM> <EM>*/</EM>
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<STRONG>void</STRONG> <STRONG>_nc_freeall(void);</STRONG>
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<STRONG>void</STRONG> <STRONG>_nc_free_and_exit(int</STRONG> <EM>code</EM><STRONG>);</STRONG>
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<STRONG>void</STRONG> <STRONG>_nc_free_tinfo(int</STRONG> <EM>code</EM><STRONG>);</STRONG>
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</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
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These functions are used to simplify analysis of memory leaks in the
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<EM>ncurses</EM> library.
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Any implementation of curses must not free the memory associated with a
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screen, since (even after calling <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG>), it must be available for
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use in the next call to <STRONG><A HREF="curs_refresh.3x.html">refresh(3x)</A></STRONG>. There are also chunks of memory
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held for performance reasons. That makes it hard to analyze curses
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applications for memory leaks. When using the specially configured
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debugging version of the <EM>ncurses</EM> library, applications can call
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functions which free those chunks of memory, simplifying the process of
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memory-leak checking.
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Some of the functions are named with a "_nc_" prefix because they are
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not intended for use in the non-debugging library:
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<STRONG>_nc_freeall</STRONG>
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This frees (almost) all of the memory allocated by <EM>ncurses</EM>.
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<STRONG>_nc_free_and_exit</STRONG>
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This frees the memory allocated by <EM>ncurses</EM> (like <STRONG>_nc_freeall</STRONG>), and
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exits the program. It is preferred over <STRONG>_nc_freeall</STRONG> since some of
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that memory may be required to keep the application running.
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Simply exiting (with the given exit-code) is safer.
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<STRONG>_nc_free_tinfo</STRONG>
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Use this function if only the low-level terminfo functions (and
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corresponding library) are used. Like <STRONG>_nc_free_and_exit</STRONG>, it exits
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the program after freeing memory.
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The functions prefixed "_nc" are normally not available; they must be
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configured into the library at build time using the <STRONG>--disable-leaks</STRONG>
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option. That compiles-in code that frees memory that normally would
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not be freed.
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The <STRONG>exit_curses</STRONG> and <STRONG>exit_terminfo</STRONG> functions call <STRONG>_nc_free_and_exit</STRONG> and
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<STRONG>_nc_free_tinfo</STRONG> if the library is configured to support memory-leak
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checking. If the library is not configured to support memory-leak
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checking, they simply call <STRONG>exit</STRONG>.
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</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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These functions do not return a value.
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</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
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These functions are not part of X/Open Curses; nor do other
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implementations of curses provide a similar feature.
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In any implementation of X/Open Curses, an application can free part of
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the memory allocated by curses:
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<STRONG>o</STRONG> The portable part of <STRONG>exit_curses</STRONG> can be freed using <STRONG>delscreen</STRONG>,
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passing the <EM>SCREEN</EM> pointer returned by <STRONG>newterm</STRONG>.
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In some implementations, there is a global variable <STRONG>sp</STRONG> which could
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be used, e.g., if the screen were only initialized using <STRONG>initscr</STRONG>.
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<STRONG>o</STRONG> The portable part of <STRONG>exit_terminfo</STRONG> can be freed using <STRONG>del_curterm</STRONG>.
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In this case, there is a global variable <STRONG>cur_term</STRONG> which can be used
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as parameter.
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</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>
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ncurses 6.6 2024-03-16 <STRONG><A HREF="curs_memleaks.3x.html">curs_memleaks(3x)</A></STRONG>
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</PRE>
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<div class="nav">
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<ul>
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<li><a href="#h2-NAME">NAME</a></li>
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<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
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<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
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</ul>
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</div>
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