2 * Copyright (c) 2009, Sun Microsystems, Inc.
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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
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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28 * @(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI
29 * $FreeBSD: src/lib/libc/rpc/rtime.c,v 1.9 2005/03/10 00:57:01 stefanf Exp $
30 * $DragonFly: src/lib/libc/rpc/rtime.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
34 * Copyright (c) 1988 by Sun Microsystems, Inc.
38 * rtime - get time from remote machine
40 * gets time, obtaining value from host
41 * on the udp/time socket. Since timeserver returns
42 * with time of day in seconds since Jan 1, 1900, must
43 * subtract seconds before Jan 1, 1970 to get
46 #include "namespace.h"
51 #include <sys/types.h>
52 #include <sys/socket.h>
54 #include <netinet/in.h>
57 #include "un-namespace.h"
59 extern int _rpc_dtablesize(void);
61 #define NYEARS (unsigned long)(1970 - 1900)
62 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
64 static void do_close(int);
67 rtime(struct sockaddr_in *addrp, struct timeval *timep, struct timeval *timeout)
72 unsigned long thetime;
73 struct sockaddr_in from;
78 if (timeout == NULL) {
83 s = _socket(AF_INET, type, 0);
87 addrp->sin_family = AF_INET;
89 /* TCP and UDP port are the same in this case */
90 if ((serv = getservbyname("time", "tcp")) == NULL) {
94 addrp->sin_port = serv->s_port;
96 if (type == SOCK_DGRAM) {
97 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
98 (struct sockaddr *)addrp, sizeof(*addrp));
106 res = _select(_rpc_dtablesize(), &readfds,
107 NULL, NULL, timeout);
108 } while (res < 0 && errno == EINTR);
116 fromlen = sizeof(from);
117 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
118 (struct sockaddr *)&from, &fromlen);
124 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
128 res = _read(s, (char *)&thetime, sizeof(thetime));
134 if (res != sizeof(thetime)) {
138 thetime = ntohl(thetime);
139 timep->tv_sec = thetime - TOFFSET;