1 files changed, 24 insertions, 6 deletions
diff --git a/cpukit/libmisc/shell/main_perioduse.c b/cpukit/libmisc/shell/main_perioduse.c
index 349e168cd4..9ad18d76de 100644
--- a/cpukit/libmisc/shell/main_perioduse.c
+++ b/cpukit/libmisc/shell/main_perioduse.c
@@ -21,18 +21,36 @@
 #include <rtems/shell.h>
 #include "internal.h"
 
-int rtems_shell_main_perioduse(int argc,char *argv[])
+int rtems_shell_main_perioduse(
+  int   argc,
+  char *argv[]
+)
 {
-  if ( argc >= 1 && !strcmp( argv[1], "-r" ) ) {
-    printf( "Resetting Period Usage information\n" );
-    rtems_rate_monotonic_reset_all_statistics();
-  } else {
+  /*
+   *  When invoked with no arguments, print the report.
+   */
+  if ( argc == 1 ) {
     rtems_rate_monotonic_report_statistics_with_plugin(
       stdout,
       (rtems_printk_plugin_t)fprintf
     );
+    return 0;
   }
-  return 0;
+
+  /*
+   *  When invoked with the single argument -r, reset the statistics.
+   */
+  if ( argc == 2 && !strcmp( argv[1], "-r" ) ) {
+    printf( "Resetting Period Usage information\n" );
+    rtems_rate_monotonic_reset_all_statistics();
+    return 0;
+  }
+
+  /*
+   *  OK.  The user did something wrong.
+   */
+  fprintf( stderr, "%s: [-r]\n", argv[0] );
+  return -1;
 }
 
 rtems_shell_cmd_t rtems_shell_PERIODUSE_Command = {