Every main()/exit() should return/use one of EXIT_ codes instead of magic numbers

src/bitcoind.cpp

@@ -126,7 +126,7 @@ bool AppInit(int argc, char* argv[])
         if (fCommandLine)
         {
             fprintf(stderr, "Error: There is no RPC client functionality in bitcoind anymore. Use the bitcoin-cli utility instead.\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
         if (GetBoolArg("-daemon", false))
         {
@@ -177,5 +177,5 @@ int main(int argc, char* argv[])
     // Connect bitcoind signal handlers
     noui_connect();
 
-    return (AppInit(argc, argv) ? 0 : 1);
+    return (AppInit(argc, argv) ? EXIT_SUCCESS : EXIT_FAILURE);
 }

src/qt/bitcoin.cpp

@@ -496,7 +496,7 @@ void BitcoinApplication::shutdownResult(int retval)
 void BitcoinApplication::handleRunawayException(const QString &message)
 {
     QMessageBox::critical(0, "Runaway exception", BitcoinGUI::tr("A fatal error occurred. Bitcoin can no longer continue safely and will quit.") + QString("\n\n") + message);
-    ::exit(1);
+    ::exit(EXIT_FAILURE);
 }
 
 WId BitcoinApplication::getMainWinId() const
@@ -573,13 +573,13 @@ int main(int argc, char *argv[])
     {
         HelpMessageDialog help(NULL, mapArgs.count("-version"));
         help.showOrPrint();
-        return 0;
+        return EXIT_SUCCESS;
     }
 
     /// 5. Now that settings and translations are available, ask user for data directory
     // User language is set up: pick a data directory
     if (!Intro::pickDataDirectory())
-        return 0;
+        return EXIT_SUCCESS;
 
     /// 6. Determine availability of data directory and parse bitcoin.conf
     /// - Do not call GetDataDir(true) before this step finishes
@@ -587,14 +587,14 @@ int main(int argc, char *argv[])
     {
         QMessageBox::critical(0, QObject::tr(PACKAGE_NAME),
                               QObject::tr("Error: Specified data directory \"%1\" does not exist.").arg(QString::fromStdString(mapArgs["-datadir"])));
-        return 1;
+        return EXIT_FAILURE;
     }
     try {
         ReadConfigFile(GetArg("-conf", BITCOIN_CONF_FILENAME), mapArgs, mapMultiArgs);
     } catch (const std::exception& e) {
         QMessageBox::critical(0, QObject::tr(PACKAGE_NAME),
                               QObject::tr("Error: Cannot parse configuration file: %1. Only use key=value syntax.").arg(e.what()));
-        return 1;
+        return EXIT_FAILURE;
     }
 
     /// 7. Determine network (and switch to network specific options)
@@ -608,7 +608,7 @@ int main(int argc, char *argv[])
         SelectParams(ChainNameFromCommandLine());
     } catch(std::exception &e) {
         QMessageBox::critical(0, QObject::tr(PACKAGE_NAME), QObject::tr("Error: %1").arg(e.what()));
-        return 1;
+        return EXIT_FAILURE;
     }
 #ifdef ENABLE_WALLET
     // Parse URIs on command line -- this can affect Params()
@@ -630,7 +630,7 @@ int main(int argc, char *argv[])
     // - Do this after creating app and setting up translations, so errors are
     // translated properly.
     if (PaymentServer::ipcSendCommandLine())
-        exit(0);
+        exit(EXIT_SUCCESS);
 
     // Start up the payment server early, too, so impatient users that click on
     // bitcoin: links repeatedly have their payment requests routed to this process: