Add TOD Hooks to allow BSP to take action when TOD is set

Two use cases were envisioned for this.

1) a BSP or application which desires to update a real-time clock
   when the RTEMS TOD is set.

2) a paravirtualized BSP can use this to propagate setting the time
   in an RTEMS application to the hosting environment. This enables
   the entire set of applications in the virtualized environments
   to have a single consistent TOD.

1 files changed, 12 insertions, 4 deletions

diff --git a/cpukit/posix/src/clocksettime.c b/cpukit/posix/src/clocksettime.c
index a0fdd9109f..bfae46feee 100644
--- a/cpukit/posix/src/clocksettime.c
+++ b/cpukit/posix/src/clocksettime.c
@@ -32,6 +32,8 @@ int clock_settime(
   const struct timespec *tp
 )
 {
+  bool  retval;
+
   if ( !tp )
     rtems_set_errno_and_return_minus_one( EINVAL );
 
@@ -43,19 +45,25 @@ int clock_settime(
 
     _TOD_Lock();
     _TOD_Acquire( &lock_context );
-    _TOD_Set( tp, &lock_context );
+      retval = _TOD_Set( tp, &lock_context );
     _TOD_Unlock();
+    if ( retval == false ) {
+      rtems_set_errno_and_return_minus_one( EPERM );
+    }
   }
 #ifdef _POSIX_CPUTIME
-  else if ( clock_id == CLOCK_PROCESS_CPUTIME_ID )
+  else if ( clock_id == CLOCK_PROCESS_CPUTIME_ID ) {
     rtems_set_errno_and_return_minus_one( ENOSYS );
+  }
 #endif
 #ifdef _POSIX_THREAD_CPUTIME
-  else if ( clock_id == CLOCK_THREAD_CPUTIME_ID )
+  else if ( clock_id == CLOCK_THREAD_CPUTIME_ID ) {
     rtems_set_errno_and_return_minus_one( ENOSYS );
+  }
 #endif
-  else
+  else {
     rtems_set_errno_and_return_minus_one( EINVAL );
+  }
 
   return 0;
 }