summaryrefslogtreecommitdiffstats
path: root/src/rtime.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/rtime.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/src/rtime.c b/src/rtime.c
new file mode 100644
index 0000000..29fbf0a
--- /dev/null
+++ b/src/rtime.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * - Neither the name of Sun Microsystems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1988 by Sun Microsystems, Inc.
+
+ */
+
+/*
+ * rtime - get time from remote machine
+ *
+ * gets time, obtaining value from host
+ * on the udp/time socket. Since timeserver returns
+ * with time of day in seconds since Jan 1, 1900, must
+ * subtract seconds before Jan 1, 1970 to get
+ * what unix uses.
+ */
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/poll.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <netdb.h>
+#include <sys/select.h>
+
+extern int _rpc_dtablesize( void );
+
+#define NYEARS (unsigned long)(1970 - 1900)
+#define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
+
+static void do_close( int );
+
+int
+rtime(addrp, timep, timeout)
+ struct sockaddr_in *addrp;
+ struct timeval *timep;
+ struct timeval *timeout;
+{
+ int s;
+ struct pollfd fd;
+ int milliseconds;
+ int res;
+ unsigned long thetime;
+ struct sockaddr_in from;
+ socklen_t fromlen;
+ int type;
+ struct servent *serv;
+
+ if (timeout == NULL) {
+ type = SOCK_STREAM;
+ } else {
+ type = SOCK_DGRAM;
+ }
+ s = socket(AF_INET, type, 0);
+ if (s < 0) {
+ return(-1);
+ }
+ addrp->sin_family = AF_INET;
+
+ /* TCP and UDP port are the same in this case */
+ if ((serv = getservbyname("time", "tcp")) == NULL) {
+ do_close(s);
+ return(-1);
+ }
+
+ addrp->sin_port = serv->s_port;
+
+ if (type == SOCK_DGRAM) {
+ res = sendto(s, (char *)&thetime, sizeof(thetime), 0,
+ (struct sockaddr *)addrp, sizeof(*addrp));
+ if (res < 0) {
+ do_close(s);
+ return(-1);
+ }
+
+ milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
+ fd.fd = s;
+ fd.events = POLLIN;
+ do
+ res = poll (&fd, 1, milliseconds);
+ while (res < 0 && errno == EINTR);
+ if (res <= 0) {
+ if (res == 0) {
+ errno = ETIMEDOUT;
+ }
+ do_close(s);
+ return(-1);
+ }
+ fromlen = sizeof(from);
+ res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
+ (struct sockaddr *)&from, &fromlen);
+ do_close(s);
+ if (res < 0) {
+ return(-1);
+ }
+ } else {
+ if (connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
+ do_close(s);
+ return(-1);
+ }
+ res = read(s, (char *)&thetime, sizeof(thetime));
+ do_close(s);
+ if (res < 0) {
+ return(-1);
+ }
+ }
+ if (res != sizeof(thetime)) {
+ errno = EIO;
+ return(-1);
+ }
+ thetime = ntohl(thetime);
+ timep->tv_sec = thetime - TOFFSET;
+ timep->tv_usec = 0;
+ return(0);
+}
+
+static void
+do_close(s)
+ int s;
+{
+ int save;
+
+ save = errno;
+ (void)close(s);
+ errno = save;
+}