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. */
29 #include "libiberty.h"
39 /* For systems with larger pointers than ints, this must be declared. */
43 static void xatexit_cleanup (void);
45 /* Pointer to function run by xexit. */
46 extern void (*_xexit_cleanup
) (void);
48 #define XATEXIT_SIZE 32
51 struct xatexit
*next
; /* next in list */
52 int ind
; /* next index in this table */
53 void (*fns
[XATEXIT_SIZE
]) (void); /* the table itself */
56 /* Allocate one struct statically to guarantee that we can register
57 at least a few handlers. */
58 static struct xatexit xatexit_first
;
60 /* Points to head of LIFO stack. */
61 static struct xatexit
*xatexit_head
= &xatexit_first
;
63 /* Register function FN to be run by xexit.
64 Return 0 if successful, -1 if not. */
67 xatexit (void (*fn
) (void))
69 register struct xatexit
*p
;
71 /* Tell xexit to call xatexit_cleanup. */
73 _xexit_cleanup
= xatexit_cleanup
;
76 if (p
->ind
>= XATEXIT_SIZE
)
78 if ((p
= (struct xatexit
*) malloc (sizeof *p
)) == NULL
)
81 p
->next
= xatexit_head
;
84 p
->fns
[p
->ind
++] = fn
;
88 /* Call any cleanup functions. */
91 xatexit_cleanup (void)
93 register struct xatexit
*p
;
96 for (p
= xatexit_head
; p
; p
= p
->next
)
97 for (n
= p
->ind
; --n
>= 0;)
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