1 files changed, 144 insertions, 0 deletions
diff --git a/refclock_sock.c b/refclock_sock.c
new file mode 100644
index 0000000..176310c
--- /dev/null
+++ b/refclock_sock.c
@@ -0,0 +1,144 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2009
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Unix domain socket refclock driver.
+
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "refclock.h"
+#include "logging.h"
+#include "util.h"
+#include "sched.h"
+
+#define SOCK_MAGIC 0x534f434b
+
+struct sock_sample {
+  /* Time of the measurement (system time) */
+  struct timeval tv;
+
+  /* Offset between the true time and the system time (in seconds) */
+  double offset;
+
+  /* Non-zero if the sample is from a PPS signal, i.e. another source
+     is needed to obtain seconds */
+  int pulse;
+
+  /* 0 - normal, 1 - insert leap second, 2 - delete leap second */
+  int leap;
+
+  /* Padding, ignored */
+  int _pad;
+
+  /* Protocol identifier (0x534f434b) */
+  int magic;
+};
+
+static void read_sample(int sockfd, int event, void *anything)
+{
+  struct sock_sample sample;
+  struct timespec ts;
+  RCL_Instance instance;
+  int s;
+
+  instance = (RCL_Instance)anything;
+
+  s = recv(sockfd, &sample, sizeof (sample), 0);
+
+  if (s < 0) {
+    DEBUG_LOG("Could not read SOCK sample : %s", strerror(errno));
+    return;
+  }
+
+  if (s != sizeof (sample)) {
+    DEBUG_LOG("Unexpected length of SOCK sample : %d != %ld",
+              s, (long)sizeof (sample));
+    return;
+  }
+
+  if (sample.magic != SOCK_MAGIC) {
+    DEBUG_LOG("Unexpected magic number in SOCK sample : %x != %x",
+              (unsigned int)sample.magic, (unsigned int)SOCK_MAGIC);
+    return;
+  }
+
+  UTI_TimevalToTimespec(&sample.tv, &ts);
+  UTI_NormaliseTimespec(&ts);
+
+  if (sample.pulse) {
+    RCL_AddPulse(instance, &ts, sample.offset);
+  } else {
+    RCL_AddSample(instance, &ts, sample.offset, sample.leap);
+  }
+}
+
+static int sock_initialise(RCL_Instance instance)
+{
+  struct sockaddr_un s;
+  int sockfd;
+  char *path;
+
+  path = RCL_GetDriverParameter(instance);
+ 
+  s.sun_family = AF_UNIX;
+  if (snprintf(s.sun_path, sizeof (s.sun_path), "%s", path) >= sizeof (s.sun_path)) {
+    LOG_FATAL("Path %s too long", path);
+    return 0;
+  }
+
+  sockfd = socket(AF_UNIX, SOCK_DGRAM, 0);
+  if (sockfd < 0) {
+    LOG_FATAL("socket() failed");
+    return 0;
+  }
+
+  UTI_FdSetCloexec(sockfd);
+
+  unlink(path);
+  if (bind(sockfd, (struct sockaddr *)&s, sizeof (s)) < 0) {
+    LOG_FATAL("bind(%s) failed : %s", path, strerror(errno));
+    return 0;
+  }
+
+  RCL_SetDriverData(instance, (void *)(long)sockfd);
+  SCH_AddFileHandler(sockfd, SCH_FILE_INPUT, read_sample, instance);
+  return 1;
+}
+
+static void sock_finalise(RCL_Instance instance)
+{
+  int sockfd;
+
+  sockfd = (long)RCL_GetDriverData(instance);
+  SCH_RemoveFileHandler(sockfd);
+  close(sockfd);
+}
+
+RefclockDriver RCL_SOCK_driver = {
+  sock_initialise,
+  sock_finalise,
+  NULL
+};