usr/src/lib/libc/stdlib/atexit.h

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)atexit.h    8.2 (Berkeley) %G%
 */

/* must be at least 32 to guarantee ANSI conformance */
#define ATEXIT_SIZE     32

struct atexit {
        struct atexit *next;            /* next in list */
        int ind;                        /* next index in this table */
        void (*fns[ATEXIT_SIZE])();     /* the table itself */
};

extern struct atexit *__atexit; /* points to head of LIFO stack */