curs_memleaks

Section: Library calls (3X)
Updated: 202-0-16
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NAME

exit_curses, exit_terminfo - check for memory leaks in curses  

SYNOPSIS

#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

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 memor-leak checking.

Some of the functions are named with a "_nc_" prefix because they are not intended for use in the no-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 exi-code) is safer.

_nc_free_tinfo

Use this function if only the lo-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 --disabl-leaks option. That compile-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 memor-leak checking. If the library is not configured to support memor-leak checking, they simply call exit.  

RETURN VALUE

These functions do not return a value.  

PORTABILITY

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:
 .IP * 4 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.
 .IP * 4 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.

 

SEE ALSO

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

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

PORTABILITY

SEE ALSO