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#include <netdb.h>
#include <assert.h>
#include <arpa/inet.h>
#include <stddef.h>
#include <string.h>
int main() {
struct sockaddr_in addr;
addr.sin_family = AF_INET;
assert(inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr));
char host[64];
assert(!getnameinfo((struct sockaddr*)&addr, sizeof(addr), host,
sizeof(host), NULL, 0, 0));
assert(inet_pton(AF_INET, "8.8.8.8", &addr.sin_addr));
assert(!getnameinfo((struct sockaddr*)&addr, sizeof(addr), host,
sizeof(host), NULL, 0, 0));
assert(!strcmp(host, "dns.google"));
return 0;
}
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