ggiExit3

Usage

#include <ggi/ggi.h>
int ggiInit(void);
int ggiExit(void);

Overview

ggiInit initializes the library. This function must be called before using other LibGGI functions; otherwise the results will be undefined.

ggiExit uninitializes the library (after being initialized by ggiInit) and automatically cleans up if necessary. This should be called after an application finished using the library. If any GGI functions are called after the library has been uninitialized, the results will be undefined.

ggiInit allows multiple invocations. A reference count is maintained, and to completely uninitialize the library, ggiExit must be called as many times as ggiInit has been called beforehand.

Return value

ggiInit returns 0 for OK, otherwise a ggi-error(3) code.

ggiExit returns:

0

after successfully cleaning up,

>0

the number of 'open' ggiInit calls, if there has been more than one call to ggiInit. As ggiInit and ggiExit must be used in properly nested pairs, e.g. the first ggiExit after two ggiInit's will return 1.

<0

ggi-error(3), especially if more ggiExit calls have been done than ggiInit calls.

Examples

Initialize and uninitialize LibGGI:

if (ggiInit() < 0) {
    fprintf(stderr, "Cannot initialize LibGGI!\n");
    exit(1);
}
/* Do some LibGGI stuff */
ggiExit();