Fix #844, switch to use CLOCK_REALTIME

src/os/portable/os-impl-posix-gettime.c

@@ -28,6 +28,12 @@
  * The OS-specific code must \#include the correct headers that define the
  * prototypes for these functions before including this implementation file.
  *
+ * NOTE: The OS-specific header must also define which POSIX clock ID to use -
+ * this specifies the clockid_t parameter to use with clock_gettime().  In
+ * most cases this should be CLOCK_REALTIME to allow the clock to be set, and
+ * so the application will also see any manual/administrative clock changes.
+ *
+ * The clock ID is selected by defining the #OSAL_GETTIME_SOURCE_CLOCK macro.
  */
 
 /****************************************************************************************

src/os/posix/inc/os-impl-gettime.h

@@ -31,6 +31,12 @@
 #include "osconfig.h"
 #include <time.h>
 
-#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_MONOTONIC
+/**
+ * \brief Idenfies the clock ID for OSAL clock operations on POSIX
+ *
+ * This is the POSIX clock ID that will be used to implement
+ * OS_GetLocalTime() and OS_SetLocalTime().
+ */
+#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_REALTIME
 
 #endif /* OS_IMPL_GETTIME_H  */

src/os/rtems/inc/os-impl-gettime.h

@@ -31,6 +31,12 @@
 #include "osconfig.h"
 #include <time.h>
 
-#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_MONOTONIC
+/**
+ * \brief Idenfies the clock ID for OSAL clock operations on RTEMS
+ *
+ * This is the POSIX clock ID that will be used to implement
+ * OS_GetLocalTime() and OS_SetLocalTime().
+ */
+#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_REALTIME
 
 #endif /* OS_IMPL_GETTIME_H  */

src/os/vxworks/inc/os-impl-gettime.h

@@ -31,6 +31,12 @@
 #include "osconfig.h"
 #include <time.h>
 
-#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_MONOTONIC
+/**
+ * \brief Idenfies the clock ID for OSAL clock operations on VxWorks
+ *
+ * This is the POSIX clock ID that will be used to implement
+ * OS_GetLocalTime() and OS_SetLocalTime().
+ */
+#define OSAL_GETTIME_SOURCE_CLOCK CLOCK_REALTIME
 
 #endif /* OS_IMPL_GETTIME_H  */