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"
30 #ifdef ANSI_PROTOTYPES
33 #define size_t unsigned long
40 /* For systems with larger pointers than ints, this must be declared. */
41 PTR malloc
PARAMS ((size_t));
44 static void xatexit_cleanup
PARAMS ((void));
46 /* Pointer to function run by xexit. */
47 extern void (*_xexit_cleanup
) PARAMS ((void));
49 #define XATEXIT_SIZE 32
52 struct xatexit
*next
; /* next in list */
53 int ind
; /* next index in this table */
54 void (*fns
[XATEXIT_SIZE
]) PARAMS ((void)); /* the table itself */
57 /* Allocate one struct statically to guarantee that we can register
58 at least a few handlers. */
59 static struct xatexit xatexit_first
;
61 /* Points to head of LIFO stack. */
62 static struct xatexit
*xatexit_head
= &xatexit_first
;
64 /* Register function FN to be run by xexit.
65 Return 0 if successful, -1 if not. */
69 void (*fn
) PARAMS ((void));
71 register struct xatexit
*p
;
73 /* Tell xexit to call xatexit_cleanup. */
75 _xexit_cleanup
= xatexit_cleanup
;
78 if (p
->ind
>= XATEXIT_SIZE
)
80 if ((p
= (struct xatexit
*) malloc (sizeof *p
)) == NULL
)
83 p
->next
= xatexit_head
;
86 p
->fns
[p
->ind
++] = fn
;
90 /* Call any cleanup functions. */
95 register struct xatexit
*p
;
98 for (p
= xatexit_head
; p
; p
= p
->next
)
99 for (n
= p
->ind
; --n
>= 0;)
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