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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | PORTABILITY | SEE ALSO | COLOPHON |
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curs_memleaks(3X) Library calls curs_memleaks(3X)
exit_curses, exit_terminfo - check for memory leaks in curses
#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);
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:
_nc_freeall
This frees (almost) all of the memory allocated by ncurses.
_nc_free_and_exit
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.
_nc_free_tinfo
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 memory.
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 exit.
These functions do not return a value.
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
del_curterm.
In this case, there is a global variable cur_term which can be
used as parameter.
curses(3X), curs_initscr(3X), curs_terminfo(3X)
This page is part of the ncurses (new curses) project.
Information about the project can be found at
⟨https://invisible-island.net/ncurses/ncurses.html⟩. If you have a
bug report for this manual page, send it to bug-ncurses@gnu.org.
This page was obtained from the tarball ncurses-6.6.tar.gz fetched
from ⟨https://ftp.gnu.org/gnu/ncurses/⟩ on 2026-01-16. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
ncurses @NCURSES_MAJOR@.@NCU... 2024-03-16 curs_memleaks(3X)
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HTML rendering created 2026-01-16 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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