curs_memleaks(3x) — Linux manual page


curs_memleaks(3X)                                      curs_memleaks(3X)

NAME         top

       exit_curses, exit_terminfo - curses memory-leak checking

SYNOPSIS         top

       #include <curses.h>
       void exit_curses(int code);

       #include <term.h>
       void exit_terminfo(int code);

       /* deprecated (intentionally not declared in curses.h or term.h)
       void _nc_freeall(void);
       void _nc_free_and_exit(int code);
       void _nc_free_tinfo(int code);

DESCRIPTION         top

       These functions are used to simplify analysis of memory leaks in
       the ncurses library.

       Any implementation of curses must not free the memory associated
       with a screen, since (even after calling endwin(3X)), it must be
       available for use in the next call to refresh(3X).  There are
       also chunks of memory held for performance reasons.  That makes
       it hard to analyze curses applications for memory leaks.  When
       using the specially configured debugging version of the ncurses
       library, applications can call functions which free those chunks
       of memory, simplifying the process of memory-leak checking.

       Some of the functions are named with a “_nc_” prefix because they
       are not intended for use in the non-debugging library:

            This frees (almost) all of the memory allocated by ncurses.

            This frees the memory allocated by ncurses (like
            _nc_freeall), and exits the program.  It is preferred over
            _nc_freeall since some of that memory may be required to
            keep the application running.  Simply exiting (with the
            given exit-code) is safer.

            Use this function if only the low-level terminfo functions
            (and corresponding library) are used.  Like
            _nc_free_and_exit, it exits the program after freeing

       The functions prefixed “_nc” are normally not available; they
       must be configured into the library at build time using the
       --disable-leaks option.  That compiles-in code that frees memory
       that normally would not be freed.

       The exit_curses and exit_terminfo functions call
       _nc_free_and_exit and _nc_free_tinfo if the library is configured
       to support memory-leak checking.  If the library is not
       configured to support memory-leak checking, they simply call

RETURN VALUE         top

       These functions do not return a value.

PORTABILITY         top

       These functions are not part of X/Open Curses; nor do other
       implementations of curses provide a similar feature.

       In any implementation of X/Open Curses, an application can free
       part of the memory allocated by curses:

       •   The portable part of exit_curses can be freed using
           delscreen, passing the SCREEN* pointer returned by newterm.

           In some implementations, there is a global variable sp which
           could be used, e.g., if the screen were only initialized
           using initscr.

       •   The portable part of exit_terminfo can be freed using

           In this case, there is a global variable cur_term which can
           be used as parameter.

SEE ALSO         top

       curs_initscr(3X), curs_terminfo(3X).  curses(3X).

COLOPHON         top

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