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
44 #include <sys/types.h>
46 #include <sys/socket.h>
48 #include <rpc/auth_des.h>
50 #include <netinet/in.h>
52 #define NYEARS (u_long)(1970 - 1900)
53 #define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))
55 static void do_close (int);
68 rtime (struct sockaddr_in *addrp, struct rpc_timeval *timep,
69 struct rpc_timeval *timeout)
75 /* RFC 868 says the time is transmitted as a 32-bit value. */
77 struct sockaddr_in from;
86 s = __socket (AF_INET, type, 0);
90 addrp->sin_family = AF_INET;
91 addrp->sin_port = htons (IPPORT_TIMESERVER);
92 if (type == SOCK_DGRAM)
94 res = __sendto (s, (char *) &thetime, sizeof (thetime), 0,
95 (struct sockaddr *) addrp, sizeof (*addrp));
101 milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
105 res = __poll (&fd, 1, milliseconds);
106 while (res < 0 && errno == EINTR);
110 __set_errno (ETIMEDOUT);
114 fromlen = sizeof (from);
115 res = __recvfrom (s, (char *) &thetime, sizeof (thetime), 0,
116 (struct sockaddr *) &from, &fromlen);
123 if (__connect (s, (struct sockaddr *) addrp, sizeof (*addrp)) < 0)
128 res = __read (s, (char *) &thetime, sizeof (thetime));
133 if (res != sizeof (thetime))
138 thetime = ntohl (thetime);
139 timep->tv_sec = thetime - TOFFSET;
143 libc_hidden_nolink (rtime, GLIBC_2_1)