#include <stdio.h>
#include <sys/errno.h>
#include <rpc/rpc.h>
#include <signal.h>

#define PROBE_ID (unsigned long)0x2A000001 // first prognum for free use

void probe_quit ( )
{
  fprintf ( stdout, "quitting...\n" );
  svc_unregister ( PROBE_ID, 1 );
  exit ( 0 );
};

void
probe ( rqstp, transp )
    struct svc_req *rqstp;
    SVCXPRT *transp;
{
  switch ( rqstp->rq_proc )
  {
    case NULLPROC:
      svc_sendreply ( transp, xdr_void, (void *)NULL );
    return;
    default:
      svcerr_noproc ( transp );
    return;
  };
};

int
main ( argc, argv )
  int argc;
  char *argv[];
{
  SVCXPRT *transp = NULL;
  fd_set readfds;
  int size = getdtablesize ( );

  signal ( SIGINT, probe_quit );

  if ( ( transp = svctcp_create ( RPC_ANYSOCK, 0, 0 ) ) == NULL )
  {
    perror ( "1" );
    exit ( 1 );
  };

  if ( !svc_register ( transp, PROBE_ID, 1, probe, IPPROTO_TCP ) )
  {
    perror ( "2" );
    exit ( 1 );
  };

  if ( argc > 1 ) while ( 1 )
  {
    readfds = svc_fdset;

    switch ( select ( size, &readfds, NULL, NULL, NULL ) )
    {
      case -1:
        if ( errno == EINTR )
          continue;
        else
        {
          perror ( "3" );
          exit ( 1 );
        };
      break;
      case 0:
        continue;
      break;
      default:
        if ( !bcmp ( &readfds, &svc_fdset, sizeof ( fd_set ) ) )
          continue;
        svc_getreqset ( transp );
      break;
    };
  }
  else
    svc_run ( );

  probe_quit ( );
};