/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part.  Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California  94043 */#if 0static char sccsid[] = "@(#)rtime.c	2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";#endif/* * Copyright (c) 1988 by Sun Microsystems, Inc. *//* * rtime - get time from remote machine * * gets time, obtaining value from host * on the udp/time socket.  Since timeserver returns * with time of day in seconds since Jan 1, 1900,  must * subtract seconds before Jan 1, 1970 to get * what unix uses. */#define __FORCE_GLIBC#include <features.h>#include <stdio.h>#include <unistd.h>#include <rpc/rpc.h>#include <rpc/clnt.h>#include <sys/types.h>#include <sys/poll.h>#include <sys/socket.h>#include <sys/time.h>#include <rpc/auth_des.h>#include <errno.h>#include <netinet/in.h>#define NYEARS	(u_long)(1970 - 1900)#define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))static void do_close (int);static voiddo_close (int s){  int save;  save = errno;  close (s);  __set_errno (save);}intrtime (struct sockaddr_in *addrp, struct rpc_timeval *timep,       struct rpc_timeval *timeout){  int s;  struct pollfd fd;  int milliseconds;  int res;  unsigned long thetime;  struct sockaddr_in from;  int fromlen;  int type;  if (timeout == NULL)    type = SOCK_STREAM;  else    type = SOCK_DGRAM;  s = socket (AF_INET, type, 0);  if (s < 0)    return (-1);  addrp->sin_family = AF_INET;  addrp->sin_port = htons (IPPORT_TIMESERVER);  if (type == SOCK_DGRAM)    {      res = sendto (s, (char *) &thetime, sizeof (thetime), 0,		    (struct sockaddr *) addrp, sizeof (*addrp));      if (res < 0)	{	  do_close (s);	  return -1;	}      milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);      fd.fd = s;      fd.events = POLLIN;      do	res = poll (&fd, 1, milliseconds);      while (res < 0 && errno == EINTR);      if (res <= 0)	{	  if (res == 0)	    __set_errno (ETIMEDOUT);	  do_close (s);	  return (-1);	}      fromlen = sizeof (from);      res = recvfrom (s, (char *) &thetime, sizeof (thetime), 0,		      (struct sockaddr *) &from, &fromlen);      do_close (s);      if (res < 0)	return -1;    }  else    {      if (connect (s, (struct sockaddr *) addrp, sizeof (*addrp)) < 0)	{	  do_close (s);	  return -1;	}      res = read (s, (char *) &thetime, sizeof (thetime));      do_close (s);      if (res < 0)	return (-1);    }  if (res != sizeof (thetime))    {      __set_errno (EIO);      return -1;    }  thetime = ntohl (thetime);  timep->tv_sec = thetime - TOFFSET;  timep->tv_usec = 0;  return 0;}