#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <string.h>



#define  SOCKPATH	"localsocket"



void err_sys( const char * const );



int main()
{
  struct sockaddr_un   uaddr, caddr;
  int                  usock, res;
  socklen_t            ulen;
  char                 buffer[ 128 ];

  usock = socket( PF_LOCAL, SOCK_DGRAM, 0 );
  if( usock == -1 )
    err_sys( "socket()" );

  memset( &uaddr, 0, sizeof(uaddr) );
  uaddr.sun_family = AF_LOCAL;
  strcpy( uaddr.sun_path, SOCKPATH );

  unlink( SOCKPATH );
  res = bind( usock, (struct sockaddr*)&uaddr, SUN_LEN(&uaddr) );
  if( res == -1 )
    err_sys( "bind()" );
  printf( "Socket bind()\n" );

  for( ; ; )
    {
    ulen = SUN_LEN(&uaddr);
    ulen = 0;

    printf( "uaddr sockaddr_un has %d\n", ulen );
    res = recvfrom( usock, buffer, sizeof(buffer), 0,
      (struct sockaddr*)&caddr, &ulen );
    if( res == -1 )
      err_sys( "recvfrom()" );

    buffer[res] = '\0';
    printf( "Received %d bytes\n", res );
    printf( "Remote structure has %d bytes\n", ulen );
/*      (unsigned)(htons(*((short*)caddr.sun_path))) ); */

    res = sendto( usock, "Hello\r\n", 7, 0,
      (struct sockaddr*)&caddr, ulen );
    if( res == -1 )
      err_sys( "sendto()" );
    }
}



void err_sys( const char * const mesg )
{
  perror( mesg );
  exit( -1 );
}