Adding upstream version 4.0.upstream/4.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 240 insertions, 0 deletions

diff --git a/rtc.c b/rtc.c
new file mode 100644
index 0000000..fa83173
--- /dev/null
+++ b/rtc.c
@@ -0,0 +1,240 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2003
+ * 
+ * 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.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "rtc.h"
+#include "local.h"
+#include "logging.h"
+#include "conf.h"
+
+#if defined LINUX && defined FEAT_RTC
+#include "rtc_linux.h"
+#endif /* defined LINUX */
+
+/* ================================================== */
+
+static int driver_initialised = 0;
+static int driver_preinit_ok = 0;
+
+static struct {
+  int  (*init)(void);
+  void (*fini)(void);
+  int  (*time_pre_init)(time_t driftfile_time);
+  void (*time_init)(void (*after_hook)(void*), void *anything);
+  void (*start_measurements)(void);
+  int  (*write_parameters)(void);
+  int  (*get_report)(RPT_RTC_Report *report);
+  int  (*trim)(void);
+} driver =
+{
+#if defined LINUX && defined FEAT_RTC
+  RTC_Linux_Initialise,
+  RTC_Linux_Finalise,
+  RTC_Linux_TimePreInit,
+  RTC_Linux_TimeInit,
+  RTC_Linux_StartMeasurements,
+  RTC_Linux_WriteParameters,
+  RTC_Linux_GetReport,
+  RTC_Linux_Trim
+#else
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL
+#endif 
+};
+     
+/* ================================================== */
+/* Get the last modification time of the driftfile */
+
+static time_t
+get_driftfile_time(void)
+{
+  struct stat buf;
+  char *drift_file;
+
+  drift_file = CNF_GetDriftFile();
+  if (!drift_file)
+    return 0;
+
+  if (stat(drift_file, &buf))
+    return 0;
+
+  return buf.st_mtime;
+}
+
+/* ================================================== */
+/* Set the system time to the driftfile time if it's in the future */
+
+static void
+apply_driftfile_time(time_t t)
+{
+  struct timespec now;
+
+  LCL_ReadCookedTime(&now, NULL);
+
+  if (now.tv_sec < t) {
+    if (LCL_ApplyStepOffset(now.tv_sec - t))
+      LOG(LOGS_INFO, "System time restored from driftfile");
+  }
+}
+
+/* ================================================== */
+
+void
+RTC_Initialise(int initial_set)
+{
+  time_t driftfile_time;
+  char *file_name;
+
+  /* If the -s option was specified, try to do an initial read of the RTC and
+     set the system time to it.  Also, read the last modification time of the
+     driftfile (i.e. system time when chronyd was previously stopped) and set
+     the system time to it if it's in the future to bring the clock closer to
+     the true time when the RTC is broken (e.g. it has no battery), is missing,
+     or there is no RTC driver. */
+  if (initial_set) {
+    driftfile_time = get_driftfile_time();
+
+    if (driver.time_pre_init && driver.time_pre_init(driftfile_time)) {
+      driver_preinit_ok = 1;
+    } else {
+      driver_preinit_ok = 0;
+      if (driftfile_time)
+        apply_driftfile_time(driftfile_time);
+    }
+  }
+
+  driver_initialised = 0;
+
+  /* This is how we tell whether the user wants to load the RTC
+     driver, if he is on a machine where it is an option. */
+  file_name = CNF_GetRtcFile();
+
+  if (file_name) {
+    if (CNF_GetRtcSync()) {
+      LOG_FATAL("rtcfile directive cannot be used with rtcsync");
+    }
+
+    if (driver.init) {
+      if ((driver.init)()) {
+        driver_initialised = 1;
+      }
+    } else {
+      LOG(LOGS_ERR, "RTC not supported on this operating system");
+    }
+  }
+}
+
+/* ================================================== */
+
+void
+RTC_Finalise(void)
+{
+  if (driver_initialised) {
+    (driver.fini)();
+  }
+}
+
+/* ================================================== */
+/* Start the processing to get a single measurement from the real time
+   clock, and use it to trim the system time, based on knowing the
+   drift rate of the RTC and the error the last time we set it.  If the
+   TimePreInit routine has succeeded, we can be sure that the trim required
+   is not *too* large.
+
+   We are called with a hook to a function to be called after the
+   initialisation is complete.  We also call this if we cannot do the
+   initialisation. */
+
+void
+RTC_TimeInit(void (*after_hook)(void *), void *anything)
+{
+  if (driver_initialised && driver_preinit_ok) {
+    (driver.time_init)(after_hook, anything);
+  } else {
+    (after_hook)(anything);
+  }
+}
+
+/* ================================================== */
+/* Start the RTC measurement process */
+
+void
+RTC_StartMeasurements(void)
+{
+  if (driver_initialised) {
+    (driver.start_measurements)();
+  }
+  /* Benign if driver not present */
+}
+
+/* ================================================== */
+/* Write RTC information out to RTC file.  Return 0 for success, 1 if
+   RTC driver not running, or 2 if the file cannot be written. */
+
+int
+RTC_WriteParameters(void)
+{
+  if (driver_initialised) {
+    return (driver.write_parameters)();
+  } else {
+    return RTC_ST_NODRV;
+  }
+}
+
+/* ================================================== */
+
+int
+RTC_GetReport(RPT_RTC_Report *report)
+{
+  if (driver_initialised) {
+    return (driver.get_report)(report);
+  } else {
+    return 0;
+  }
+}
+
+/* ================================================== */
+
+int
+RTC_Trim(void)
+{
+  if (driver_initialised) {
+    return (driver.trim)();
+  } else {
+    return 0;
+  }
+}
+
+/* ================================================== */
+