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    The following form allows you to view linux man pages.

    Command:

    rtime

    
    
    

    SYNOPSIS

           #include <rpc/des_crypt.h>
    
           int rtime(struct sockaddr_in *addrp, struct rpc_timeval *timep,
                     struct rpc_timeval *timeout);
    
    
    

    DESCRIPTION

           This  function uses the Time Server Protocol as described in RFC 868 to
           obtain the time from a remote machine.
    
           The Time Server Protocol gives the time in seconds since 00:00:00  UTC,
           1  Jan  1900,  and  this function subtracts the appropriate constant in
           order to convert the result to  seconds  since  the  Epoch,  1970-01-01
           00:00:00 +0000 (UTC).
    
           When  timeout is non-NULL, the udp/time socket (port 37) is used.  Oth-
           erwise, the tcp/time socket (port 37) is used.
    
    
    

    RETURN VALUE

           On success, 0 is returned, and the obtained 32-bit time value is stored
           in  timep->tv_sec.   In  case of error -1 is returned, and errno is set
           appropriately.
    
    
    

    ERRORS

           All errors for underlying functions (sendto(2),  poll(2),  recvfrom(2),
           connect(2), read(2)) can occur.  Moreover:
    
           EIO    The number of returned bytes is not 4.
    
           ETIMEDOUT
                  The waiting time as defined in timeout has expired.
    
    
    

    NOTES

           Only IPv4 is supported.
    
           Some  in.timed versions support only TCP.  Try the example program with
           use_tcp set to 1.
    
           Libc5 uses the prototype
    
               int rtime(struct sockaddr_in *, struct timeval *, struct timeval *);
    
           and requires <sys/time.h> instead of <rpc/auth_des.h>.
    
    
    

    BUGS

           rtime() in glibc 2.2.5 and earlier does not  work  properly  on  64-bit
           machines.
    
    
    

    EXAMPLE

           This  example requires that port 37 is up and open.  You may check that
           the time entry within /etc/inetd.conf is not commented out.
    
           int
           main(void)
           {
               struct sockaddr_in name;
               struct rpc_timeval time1 = {0,0};
               struct rpc_timeval timeout = {1,0};
               struct hostent *hent;
               int ret;
    
               memset(&name, 0, sizeof(name));
               sethostent(1);
               hent = gethostbyname(servername);
               memcpy(&name.sin_addr, hent->h_addr, hent->h_length);
    
               ret = rtime(&name, &time1, use_tcp ? NULL : &timeout);
               if (ret < 0)
                   perror("rtime error");
               else {
                   time_t t = time1.tv_sec;
                   printf("%s\n", ctime(&t));
               }
    
               exit(EXIT_SUCCESS);
           }
    
    
    

    SEE ALSO

           ntpdate(1), inetd(8)
    
    
    

    GNU 2014-01-05 RTIME(3)

    
    
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