2 * Copyright (c) 2010, Oracle America, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 * * Neither the name of the "Oracle America, 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
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
25 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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_sunrpc (rtime
, GLIBC_2_1
)