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#include <errno.h>
#include <stdlib.h>
#include "_stdlib.h"
/** register a function to run at program exit **/
int atexit(void (*func)(void))
{
struct atexit *ae = &(__stdlib.atexit);
while (ae->nfns == sizeof(ae->fns) / sizeof(ae->fns[0])) {
if (ae->next == NULL) {
ae->next = calloc(1, sizeof(*ae->next));
if (ae->next == NULL) {
#ifdef ENOMEM
errno = ENOMEM;
#endif
return 1;
}
ae->next->prev = ae;
}
ae = ae->next;
}
ae->fns[ae->nfns++] = func;
return 0;
}
/***
registers the function ARGUMENT(func) to be called when the program
exits normally by calling FUNCTION(exit) or returning from FUNCTION(main). The
function must take no parameters and return no value.
***/
/*
IMPLEMENTATION(The number of registrations allowed (at least 32))
RETURN_FAILURE(NONZERO)
RETURN_SUCCESS(0)
STDC(1)
*/
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