1 files changed, 12 insertions, 0 deletions
diff --git a/winsup/utils/gmondump.c b/winsup/utils/gmondump.c
index e469f01..ec9db05 100644
--- a/winsup/utils/gmondump.c
+++ b/winsup/utils/gmondump.c
@@ -46,6 +46,14 @@ OPTIONS are:\n\
   exit (where == stderr ? 1 : 0 );
 }
 
+void __attribute__ ((__noreturn__))
+usage1 (FILE *where)
+{
+  fprintf (where, "Usage: %s [OPTIONS] FILENAME...\n", pgm);
+
+  exit (where == stderr ? 1 : 0 );
+}
+
 void
 note (const char *fmt, ...)
 {
@@ -248,6 +256,10 @@ main(int argc, char **argv)
         ;
       }
 
+  if (optind >= argc)
+    /* Print one-line help and exit. */
+    usage1 (ofile);
+
   for (int i = optind; i < argc; i++)
     gmondump1 (argv[i]);