2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
25 * Sun Microsystems, Inc.
27 * Mountain View, California 94043
29 * @(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI
30 * $FreeBSD: src/lib/libc/rpc/rtime.c,v 1.9 2005/03/10 00:57:01 stefanf Exp $
31 * $DragonFly: src/lib/libc/rpc/rtime.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
35 * Copyright (c) 1988 by Sun Microsystems, Inc.
39 * rtime - get time from remote machine
41 * gets time, obtaining value from host
42 * on the udp/time socket. Since timeserver returns
43 * with time of day in seconds since Jan 1, 1900, must
44 * subtract seconds before Jan 1, 1970 to get
47 #include "namespace.h"
52 #include <sys/types.h>
53 #include <sys/socket.h>
55 #include <netinet/in.h>
58 #include "un-namespace.h"
60 extern int _rpc_dtablesize(void);
62 #define NYEARS (unsigned long)(1970 - 1900)
63 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
65 static void do_close(int);
68 rtime(struct sockaddr_in *addrp, struct timeval *timep, struct timeval *timeout)
73 unsigned long thetime;
74 struct sockaddr_in from;
79 if (timeout == NULL) {
84 s = _socket(AF_INET, type, 0);
88 addrp->sin_family = AF_INET;
90 /* TCP and UDP port are the same in this case */
91 if ((serv = getservbyname("time", "tcp")) == NULL) {
95 addrp->sin_port = serv->s_port;
97 if (type == SOCK_DGRAM) {
98 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
99 (struct sockaddr *)addrp, sizeof(*addrp));
107 res = _select(_rpc_dtablesize(), &readfds,
108 (fd_set *)NULL, (fd_set *)NULL, timeout);
109 } while (res < 0 && errno == EINTR);
117 fromlen = sizeof(from);
118 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
119 (struct sockaddr *)&from, &fromlen);
125 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
129 res = _read(s, (char *)&thetime, sizeof(thetime));
135 if (res != sizeof(thetime)) {
139 thetime = ntohl(thetime);
140 timep->tv_sec = thetime - TOFFSET;