main: fixup parameter parsing for user program

The user program expects 'optind' to be reset and for 'argv' and 'argc'
to include the program name as the first argument variable.

Note: our mmap()/mprotect()-based snapshotting does not snapshot this
'optind' global, so user-progs that use optarg() functionality might
fail.

diff --git a/main.cc b/main.cc
index 8a17a18e50d718324662e178f6496dec58fbbe00..e8d4f9af356f4ac6a59ab21f69fc26d6bd2d12bb 100644 (file)
--- a/main.cc
+++ b/main.cc
@@ -75,8 +75,10 @@ static void parse_options(struct model_params *params, int *argc, char ***argv)
                        break;
                }
        }
-       (*argc) -= optind;
-       (*argv) += optind;
+       (*argv)[optind - 1] = (*argv)[0];
+       (*argc) -= (optind - 1);
+       (*argv) += (optind - 1);
+       optind = 1;
 
        if (error)
                print_usage(params);