Fix semaphore post overflow status

Close #2720.

2 files changed, 13 insertions, 6 deletions

diff --git a/cpukit/posix/src/semaphoretranslatereturncode.c b/cpukit/posix/src/semaphoretranslatereturncode.c
index d7b99eaf67..04b293d349 100644
--- a/cpukit/posix/src/semaphoretranslatereturncode.c
+++ b/cpukit/posix/src/semaphoretranslatereturncode.c
@@ -27,8 +27,5 @@ const int _POSIX_Semaphore_Return_codes[CORE_SEMAPHORE_STATUS_LAST + 1] = {
   EAGAIN,              /* CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT */
   EINVAL,              /* CORE_SEMAPHORE_WAS_DELETED */
   ETIMEDOUT,           /* CORE_SEMAPHORE_TIMEOUT */
-  /* The next error can not occur since we set the maximum
-   * count to the largest value the count can hold.
-   */
-  ENOSYS,              /* CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED */
+  EOVERFLOW            /* CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED */
 };
diff --git a/cpukit/posix/src/sempost.c b/cpukit/posix/src/sempost.c
index 86d2f5acf6..f4633dcf70 100644
--- a/cpukit/posix/src/sempost.c
+++ b/cpukit/posix/src/sempost.c
@@ -19,6 +19,7 @@
 #endif
 
 #include <semaphore.h>
+#include <limits.h>
 
 #include <rtems/posix/semaphoreimpl.h>
 
@@ -28,6 +29,7 @@ int sem_post(
 {
   POSIX_Semaphore_Control *the_semaphore;
   Thread_queue_Context     queue_context;
+  CORE_semaphore_Status    status;
 
   the_semaphore = _POSIX_Semaphore_Get( sem, &queue_context );
 
@@ -35,9 +37,17 @@ int sem_post(
     rtems_set_errno_and_return_minus_one( EINVAL );
   }
 
-  _CORE_semaphore_Surrender(
+  status = _CORE_semaphore_Surrender(
     &the_semaphore->Semaphore,
+    SEM_VALUE_MAX,
     &queue_context
   );
-  return 0;
+
+  if ( status == CORE_SEMAPHORE_STATUS_SUCCESSFUL ) {
+    return 0;
+  }
+
+  rtems_set_errno_and_return_minus_one(
+    _POSIX_Semaphore_Translate_core_semaphore_return_code( status )
+  );
 }