2 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
30 * Copyright (c) 1988 by Sun Microsystems, Inc.
35 * rtime - get time from remote machine
37 * gets time, obtaining value from host
38 * on the udp/time socket. Since timeserver returns
39 * with time of day in seconds since Jan 1, 1900, must
40 * subtract seconds before Jan 1, 1970 to get
43 #include "namespace.h"
48 #include <sys/types.h>
49 #include <sys/socket.h>
51 #include <netinet/in.h>
54 #include "un-namespace.h"
56 #if defined(LIBC_SCCS) && !defined(lint)
57 static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
59 #include <sys/cdefs.h>
60 __FBSDID("$FreeBSD$");
62 extern int _rpc_dtablesize( void );
64 #define NYEARS (unsigned long)(1970 - 1900)
65 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
67 static void do_close( int );
70 rtime(struct sockaddr_in *addrp, struct timeval *timep,
71 struct timeval *timeout)
76 unsigned long thetime;
77 struct sockaddr_in from;
82 if (timeout == NULL) {
87 s = _socket(AF_INET, type, 0);
91 addrp->sin_family = AF_INET;
93 /* TCP and UDP port are the same in this case */
94 if ((serv = getservbyname("time", "tcp")) == NULL) {
98 addrp->sin_port = serv->s_port;
100 if (type == SOCK_DGRAM) {
101 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
102 (struct sockaddr *)addrp, sizeof(*addrp));
110 res = _select(_rpc_dtablesize(), &readfds,
111 (fd_set *)NULL, (fd_set *)NULL, timeout);
112 } while (res < 0 && errno == EINTR);
120 fromlen = sizeof(from);
121 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
122 (struct sockaddr *)&from, &fromlen);
128 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
132 res = _read(s, (char *)&thetime, sizeof(thetime));
138 if (res != sizeof(thetime)) {
142 thetime = ntohl(thetime);
143 timep->tv_sec = thetime - TOFFSET;