code:

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..

struct in_addr {
	u_int32_t s_addr;
};

..

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code:

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#include <unistd.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>

struct in_addr {
    unsigned long s_addr;
};

#include <arpa/inet.h>

int main()
{
    struct hostent * host;
    char hostname[200];
    if ( gethostname( hostname, 200 ) == 0 )
    {
        int i;
        host = gethostbyname( hostname );
        printf( "Hostname: %sn", host->h_name );
        for ( i = 0; host->h_aliases[i] != 0; ++i )
        {
            printf( "Alias #%d: %sn", i, host->h_aliases[i] );
        }

        for ( i = 0; host->h_addr_list[i] != 0; ++i )
        {
            struct in_addr in;
            memcpy( &in.s_addr, host->h_addr_list[i], sizeof( in.s_addr ) );
            printf( "%sn", inet_ntoa(in) );
        }
    }
    return 0;
}

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