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24 lines
455 B
24 lines
455 B
#define _GNU_SOURCE
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#include <netdb.h>
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#include <errno.h>
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#include <stdlib.h>
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struct hostent *gethostbyaddr(const void *a, socklen_t l, int af)
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{
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static struct hostent *h;
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size_t size = 63;
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struct hostent *res;
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int err;
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do {
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free(h);
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h = malloc(size+=size+1);
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if (!h) {
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h_errno = NO_RECOVERY;
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return 0;
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}
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err = gethostbyaddr_r(a, l, af, h,
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(void *)(h+1), size-sizeof *h, &res, &h_errno);
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} while (err == ERANGE);
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return res;
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}
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