github.com/afumu/libc@v0.0.6/musl/src/network/gethostbyaddr.c (about)

     1  #define _GNU_SOURCE
     2  
     3  #include <netdb.h>
     4  #include <errno.h>
     5  #include <stdlib.h>
     6  
     7  struct hostent *gethostbyaddr(const void *a, socklen_t l, int af)
     8  {
     9  	static struct hostent *h;
    10  	size_t size = 63;
    11  	struct hostent *res;
    12  	int err;
    13  	do {
    14  		free(h);
    15  		h = malloc(size+=size+1);
    16  		if (!h) {
    17  			h_errno = NO_RECOVERY;
    18  			return 0;
    19  		}
    20  		err = gethostbyaddr_r(a, l, af, h,
    21  			(void *)(h+1), size-sizeof *h, &res, &h_errno);
    22  	} while (err == ERANGE);
    23  	return err ? 0 : h;
    24  }