2 * Copyright (c) 2010, Oracle America, Inc.
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5 * modification, are permitted provided that the following conditions are
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9 * notice, this list of conditions and the following disclaimer.
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11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials
13 * provided with the distribution.
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15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
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32 * rtime - get time from remote machine
34 * gets time, obtaining value from host
35 * on the udp/time socket. Since timeserver returns
36 * with time of day in seconds since Jan 1, 1900, must
37 * subtract seconds before Jan 1, 1970 to get
45 #include <sys/types.h>
47 #include <sys/socket.h>
49 #include <rpc/auth_des.h>
51 #include <netinet/in.h>
53 #define NYEARS (u_long)(1970 - 1900)
54 #define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))
56 static void do_close (int);
69 rtime (struct sockaddr_in *addrp, struct rpc_timeval *timep,
70 struct rpc_timeval *timeout)
76 /* RFC 868 says the time is transmitted as a 32-bit value. */
78 struct sockaddr_in from;
87 s = __socket (AF_INET, type, 0);
91 addrp->sin_family = AF_INET;
92 addrp->sin_port = htons (IPPORT_TIMESERVER);
93 if (type == SOCK_DGRAM)
95 res = __sendto (s, (char *) &thetime, sizeof (thetime), 0,
96 (struct sockaddr *) addrp, sizeof (*addrp));
102 milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
106 res = __poll (&fd, 1, milliseconds);
107 while (res < 0 && errno == EINTR);
111 __set_errno (ETIMEDOUT);
115 fromlen = sizeof (from);
116 res = __recvfrom (s, (char *) &thetime, sizeof (thetime), 0,
117 (struct sockaddr *) &from, &fromlen);
124 if (__connect (s, (struct sockaddr *) addrp, sizeof (*addrp)) < 0)
129 res = __read (s, (char *) &thetime, sizeof (thetime));
134 if (res != sizeof (thetime))
139 thetime = ntohl (thetime);
140 timep->tv_sec = thetime - TOFFSET;
144 libc_hidden_nolink_sunrpc (rtime, GLIBC_2_1)