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1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Chris Torek. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #if defined(LIBC_SCCS) && !defined(lint) | |
12 | static char sccsid[] = "@(#)atexit.c 5.1 (Berkeley) %G%"; | |
13 | #endif /* LIBC_SCCS and not lint */ | |
14 | ||
15 | #include <stddef.h> | |
16 | #include <stdlib.h> | |
17 | #include "atexit.h" | |
18 | ||
19 | /* | |
20 | * Register a function to be performed at exit. | |
21 | */ | |
22 | int | |
23 | atexit(fn) | |
24 | void (*fn)(); | |
25 | { | |
26 | static struct atexit __atexit0; /* one guaranteed table */ | |
27 | register struct atexit *p; | |
28 | ||
29 | if ((p = __atexit) == NULL) | |
30 | __atexit = p = &__atexit0; | |
31 | if (p->ind >= ATEXIT_SIZE) { | |
32 | if ((p = malloc(sizeof(*p))) == NULL) | |
33 | return (-1); | |
34 | __atexit->next = p; | |
35 | __atexit = p; | |
36 | } | |
37 | p->fns[p->ind++] = fn; | |
38 | return (0); | |
39 | } |