2 * Copyright (c) 1990 Regents of the University of California.
5 * %sccs.include.redist.c%
11 @deftypefun int xatexit (void (*@var{fn}) (void))
13 Behaves as the standard @code{atexit} function, but with no limit on
14 the number of registered functions. Returns 0 on success, or @minus{}1 on
15 failure. If you use @code{xatexit} to register functions, you must use
16 @code{xexit} to terminate your program.
22 /* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
23 If you use xatexit, you must call xexit instead of exit. */
26 #include "libiberty.h"
33 #define size_t unsigned long
36 /* For systems with larger pointers than ints, this must be declared. */
37 PTR malloc
PARAMS ((size_t));
39 static void xatexit_cleanup
PARAMS ((void));
41 /* Pointer to function run by xexit. */
42 extern void (*_xexit_cleanup
) PARAMS ((void));
44 #define XATEXIT_SIZE 32
47 struct xatexit
*next
; /* next in list */
48 int ind
; /* next index in this table */
49 void (*fns
[XATEXIT_SIZE
]) PARAMS ((void)); /* the table itself */
52 /* Allocate one struct statically to guarantee that we can register
53 at least a few handlers. */
54 static struct xatexit xatexit_first
;
56 /* Points to head of LIFO stack. */
57 static struct xatexit
*xatexit_head
= &xatexit_first
;
59 /* Register function FN to be run by xexit.
60 Return 0 if successful, -1 if not. */
64 void (*fn
) PARAMS ((void));
66 register struct xatexit
*p
;
68 /* Tell xexit to call xatexit_cleanup. */
70 _xexit_cleanup
= xatexit_cleanup
;
73 if (p
->ind
>= XATEXIT_SIZE
)
75 if ((p
= (struct xatexit
*) malloc (sizeof *p
)) == NULL
)
78 p
->next
= xatexit_head
;
81 p
->fns
[p
->ind
++] = fn
;
85 /* Call any cleanup functions. */
90 register struct xatexit
*p
;
93 for (p
= xatexit_head
; p
; p
= p
->next
)
94 for (n
= p
->ind
; --n
>= 0;)
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