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1 /*
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2 * Copyright (c) 1990 Regents of the University of California.
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3 * All rights reserved.
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4 *
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5 * %sccs.include.redist.c%
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6 */
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7
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8
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9 /*
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10
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11 @deftypefun int xatexit (void (*@var{fn}) (void))
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12
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13 Behaves as the standard @code{atexit} function, but with no limit on
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14 the number of registered functions. Returns 0 on success, or @minus{}1 on
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15 failure. If you use @code{xatexit} to register functions, you must use
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16 @code{xexit} to terminate your program.
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17
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18 @end deftypefun
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19
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20 */
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21
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22 /* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
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23 If you use xatexit, you must call xexit instead of exit. */
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24
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25 #ifdef HAVE_CONFIG_H
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26 #include "config.h"
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27 #endif
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28 #include "ansidecl.h"
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29 #include "libiberty.h"
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30
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31 #include <stdio.h>
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32
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33 #include <stddef.h>
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34
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35 #if VMS
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36 #include <stdlib.h>
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37 #include <unixlib.h>
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38 #else
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39 /* For systems with larger pointers than ints, this must be declared. */
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40 PTR malloc (size_t);
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41 #endif
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42
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43 static void xatexit_cleanup (void);
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44
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45 /* Pointer to function run by xexit. */
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46 extern void (*_xexit_cleanup) (void);
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47
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48 #define XATEXIT_SIZE 32
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49
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50 struct xatexit {
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51 struct xatexit *next; /* next in list */
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52 int ind; /* next index in this table */
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53 void (*fns[XATEXIT_SIZE]) (void); /* the table itself */
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54 };
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55
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56 /* Allocate one struct statically to guarantee that we can register
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57 at least a few handlers. */
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58 static struct xatexit xatexit_first;
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59
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60 /* Points to head of LIFO stack. */
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61 static struct xatexit *xatexit_head = &xatexit_first;
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62
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63 /* Register function FN to be run by xexit.
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64 Return 0 if successful, -1 if not. */
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65
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66 int
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67 xatexit (void (*fn) (void))
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68 {
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69 register struct xatexit *p;
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70
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71 /* Tell xexit to call xatexit_cleanup. */
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72 if (!_xexit_cleanup)
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73 _xexit_cleanup = xatexit_cleanup;
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74
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75 p = xatexit_head;
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76 if (p->ind >= XATEXIT_SIZE)
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77 {
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78 if ((p = (struct xatexit *) malloc (sizeof *p)) == NULL)
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79 return -1;
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80 p->ind = 0;
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81 p->next = xatexit_head;
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82 xatexit_head = p;
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83 }
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84 p->fns[p->ind++] = fn;
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85 return 0;
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86 }
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87
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88 /* Call any cleanup functions. */
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89
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90 static void
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91 xatexit_cleanup (void)
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92 {
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93 register struct xatexit *p;
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94 register int n;
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95
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96 for (p = xatexit_head; p; p = p->next)
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97 for (n = p->ind; --n >= 0;)
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98 (*p->fns[n]) ();
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99 }
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