2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * POSSIBILITY OF SUCH DAMAGE.
32 * Copyright (c) 1988 by Sun Microsystems, Inc.
37 * rtime - get time from remote machine
39 * gets time, obtaining value from host
40 * on the udp/time socket. Since timeserver returns
41 * with time of day in seconds since Jan 1, 1900, must
42 * subtract seconds before Jan 1, 1970 to get
45 #include "namespace.h"
50 #include <sys/types.h>
51 #include <sys/socket.h>
53 #include <netinet/in.h>
56 #include "un-namespace.h"
58 #if defined(LIBC_SCCS) && !defined(lint)
59 static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
61 #include <sys/cdefs.h>
62 __FBSDID("$FreeBSD$");
64 extern int _rpc_dtablesize( void );
66 #define NYEARS (unsigned long)(1970 - 1900)
67 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
69 static void do_close( int );
72 rtime(struct sockaddr_in *addrp, struct timeval *timep,
73 struct timeval *timeout)
78 unsigned long thetime;
79 struct sockaddr_in from;
84 if (timeout == NULL) {
89 s = _socket(AF_INET, type, 0);
93 addrp->sin_family = AF_INET;
95 /* TCP and UDP port are the same in this case */
96 if ((serv = getservbyname("time", "tcp")) == NULL) {
100 addrp->sin_port = serv->s_port;
102 if (type == SOCK_DGRAM) {
103 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
104 (struct sockaddr *)addrp, sizeof(*addrp));
112 res = _select(_rpc_dtablesize(), &readfds,
113 (fd_set *)NULL, (fd_set *)NULL, timeout);
114 } while (res < 0 && errno == EINTR);
122 fromlen = sizeof(from);
123 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
124 (struct sockaddr *)&from, &fromlen);
130 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
134 res = _read(s, (char *)&thetime, sizeof(thetime));
140 if (res != sizeof(thetime)) {
144 thetime = ntohl(thetime);
145 timep->tv_sec = thetime - TOFFSET;