48 lines
806 B
C
48 lines
806 B
C
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#include <stdint.h>
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#include <stdlib.h>
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#include <syscall.h>
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struct atexit_cb {
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struct atexit_cb *next;
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void (*cb)(void);
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};
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static uint64_t _atexit_count = 0;
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static struct atexit_cb _atexits[32]; // POSIX requires at least 32 atexit functions
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static struct atexit_cb *_atexit_last = NULL;
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int
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atexit(void (*function)(void))
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{
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if (_atexit_count < 32) {
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struct atexit_cb *prev = _atexit_last;
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_atexits[_atexit_count].cb = function;
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_atexits[_atexit_count].next = prev;
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_atexit_last = &_atexits[_atexit_count];
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_atexit_count++;
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} else {
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// XXX: Support malloc
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return -1;
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}
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return 0;
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}
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void
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exit(int status)
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{
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while (_atexit_last != NULL) {
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(_atexit_last->cb)();
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_atexit_last = _atexit_last->next;
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}
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SystemExit(status);
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__builtin_unreachable();
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}
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