Trying setuid root code, no go.

Seq66qt5/seq66qt5.cpp

@@ -25,7 +25,7 @@
  * \library       seq66qt5 application
  * \author        Chris Ahlstrom
  * \date          2017-09-05
- * \updates       2023-11-30
+ * \updates       2023-12-05
  * \license       GNU GPLv2 or above
  *
  *  This is an attempt to change from the hoary old (or, as H.P. Lovecraft
@@ -39,11 +39,21 @@
 #include "os/daemonize.hpp"             /* seq66::session_close(), etc.     */
 #include "os/timing.hpp"                /* seq66::millisleep()              */
 
-#undef  SEQ66_LOCALE_SUPPORT
-#undef  SEQ66_TRANSLATOR_SUPPORT
-
+#undef  SEQ66_LOCALE_SUPPORT            /* using --locale instead           */
+#undef  SEQ66_TRANSLATOR_SUPPORT        /* we're not ready for this at all  */
 #undef  USE_RING_BUFFER_TEST            /* enable to check ring_buffer ops  */
 
+/*
+ * Without the QCoreApplication::setSetuidAllow() call, the application dumps
+ * core if setuid root in the install. However, This yields this message many
+ * many times when run as setuid root; "QCommonStyle::drawComplexControl:
+ * Control 1 not handled" Not sure what is up with that. The result is
+ * that the user interface is flat and cramped! In any case, Qt warns not
+ * to use setuid root because Qt has "a large attack surface" :-D.
+ */
+
+#undef  SEQ66_SETUID_SUPPORT            /* Qt aborts with setuid otherwise  */
+
 #if defined USE_RING_BUFFER_TEST        /* requires a debug build           */
 #include "util/ring_buffer.hpp"
 #endif
@@ -84,6 +94,10 @@ static const int sc_sleep_time_ms = 250;
 int
 main (int argc, char * argv [])
 {
+#if defined SEQ66_SETUID_SUPPORT
+    QApplication::setSetuidAllowed(true);
+#endif
+
     QApplication app(argc, argv);           /* main application object      */
 #if defined USE_NEW_CODE
     seq66::smanager::app_info(argv[0], true);

TODO

@@ -4,8 +4,8 @@ Chris Ahlstrom
 
 Misc:
 
-    -   If record-buss active, still need to process non-inbuss pattern
-        if no inbusses specified.
+    -   longhair.mid load error: Offset ~0x8 of 0x5c1c bytes (8/23580):
+        Invalid MIDI header chunk detected. Bad value 0x0.
     -   Grid-mode options:
         -   Now can click again to undo the solo. But doing two more
             solos in a row clears the first non-soloed snapshot. Hmmm.