Revert "[lldb server] Tidy up LLDB server return codes and associated…

… tests"

This reverts commit e387c8c. The
TestErrorMessages.test is failing on the Linux bots.

lldb/test/Shell/lldb-server/TestErrorMessages.test

@@ -1,26 +1,14 @@
-RUN: not %lldb-server gdbserver --fd 2>&1 | FileCheck --check-prefixes=FD1,GDB_REMOTE_ALL %s
+RUN: %lldb-server gdbserver --fd 2>&1 | FileCheck --check-prefixes=FD1,ALL %s
 FD1: error: --fd: missing argument
 
-RUN: not %lldb-server gdbserver --fd three 2>&1 | FileCheck --check-prefixes=FD2,GDB_REMOTE_ALL %s
+RUN: %lldb-server gdbserver --fd three 2>&1 | FileCheck --check-prefixes=FD2,ALL %s
 FD2: error: invalid '--fd' argument
 
-RUN: not %lldb-server gdbserver --bogus 2>&1 | FileCheck --check-prefixes=BOGUS,GDB_REMOTE_ALL %s
+RUN: %lldb-server gdbserver --bogus 2>&1 | FileCheck --check-prefixes=BOGUS,ALL %s
 BOGUS: error: unknown argument '--bogus'
 
-RUN: not %lldb-server gdbserver 2>&1 | FileCheck --check-prefixes=CONN,GDB_REMOTE_ALL %s
+RUN: %lldb-server gdbserver 2>&1 | FileCheck --check-prefixes=CONN,ALL %s
 CONN: error: no connection arguments
 
-RUN: %lldb-server platform 2>&1 | FileCheck --check-prefixes=LLDB_PLATFORM_ALL %s
-
-RUN: %lldb-server platform --fd 2>&1 | FileCheck --check-prefixes=FD3,LLDB_PLATFORM_ALL %s
-FD3: lldb-server: unrecognized option `--fd'
-
-RUN: not %lldb-server platform --min-gdbserver-port 42 --max-gdbserver-port 43 2>&1 | FileCheck --check-prefixes=PORT1,LLDB_PLATFORM_ALL %s
-PORT1: error: port number 42 is not in the valid user port range of 1024 - 49152 
-
-RUN: %lldb-server version 2>&1 | FileCheck --check-prefixes=VERSION %s
-VERSION: lldb version
-
-GDB_REMOTE_ALL: Use '{{.*}} g[dbserver] --help' for a complete list of options.
-LLDB_PLATFORM_ALL: lldb-server platform [--log-file log-file-name] [--log-channels log-channel-list] [--port-file port-file-path] --server --listen port 
+ALL: Use '{{.*}} g[dbserver] --help' for a complete list of options.
 

lldb/test/Shell/lldb-server/TestGdbserverPort.test

@@ -1,4 +1,4 @@
 # Windows does not build lldb-server.
 # UNSUPPORTED: system-windows
-# RUN: not %platformserver --server --listen :1234 --min-gdbserver-port 1234 --max-gdbserver-port 1234 2>&1 | FileCheck %s
+# RUN: %platformserver --server --listen :1234 --min-gdbserver-port 1234 --max-gdbserver-port 1234 2>&1 | FileCheck %s
 # CHECK: error: --min-gdbserver-port (1234) is not lower than --max-gdbserver-port (1234)

lldb/tools/lldb-server/lldb-platform.cpp

@@ -92,6 +92,7 @@ static void display_usage(const char *progname, const char *subcommand) {
                   "log-channel-list] [--port-file port-file-path] --server "
                   "--listen port\n",
           progname, subcommand);
+  exit(0);
 }
 
 static Status save_socket_id_to_file(const std::string &socket_id,
@@ -164,6 +165,7 @@ int main_platform(int argc, char *argv[]) {
   FileSpec socket_file;
   bool show_usage = false;
   int option_error = 0;
+  int socket_error = -1;
 
   std::string short_options(OptionParser::GetShortOptionString(g_long_options));
 
@@ -247,7 +249,7 @@ int main_platform(int argc, char *argv[]) {
   }
 
   if (!LLDBServerUtilities::SetupLogging(log_file, log_channels, 0))
-    return 1;
+    return -1;
 
   // Make a port map for a port range that was specified.
   if (min_gdbserver_port && min_gdbserver_port < max_gdbserver_port) {
@@ -267,7 +269,7 @@ int main_platform(int argc, char *argv[]) {
 
   if (show_usage || option_error) {
     display_usage(progname, subcommand);
-    return option_error;
+    exit(option_error);
   }
 
   // Skip any options we consumed with getopt_long_only.
@@ -286,13 +288,13 @@ int main_platform(int argc, char *argv[]) {
       listen_host_port, children_inherit_listen_socket, error));
   if (error.Fail()) {
     fprintf(stderr, "failed to create acceptor: %s", error.AsCString());
-    return 1;
+    exit(socket_error);
   }
 
   error = acceptor_up->Listen(backlog);
   if (error.Fail()) {
     printf("failed to listen: %s\n", error.AsCString());
-    return 1;
+    exit(socket_error);
   }
   if (socket_file) {
     error =
@@ -320,7 +322,7 @@ int main_platform(int argc, char *argv[]) {
     error = acceptor_up->Accept(children_inherit_accept_socket, conn);
     if (error.Fail()) {
       WithColor::error() << error.AsCString() << '\n';
-      return 1;
+      exit(socket_error);
     }
     printf("Connection established.\n");
     if (g_server) {

lldb/tools/lldb-server/lldb-server.cpp

@@ -11,7 +11,6 @@
 #include "lldb/lldb-private.h"
 
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/ManagedStatic.h"
@@ -53,30 +52,29 @@ int main(int argc, char *argv[]) {
   llvm::InitLLVM IL(argc, argv, /*InstallPipeSignalExitHandler=*/false);
   llvm::PrettyStackTraceProgram X(argc, argv);
 
+  int option_error = 0;
   const char *progname = argv[0];
   if (argc < 2) {
     display_usage(progname);
-    return 1;
+    exit(option_error);
   }
 
   switch (argv[1][0]) {
-  case 'g': {
+  case 'g':
     llgs::initialize();
-    auto deinit = llvm::make_scope_exit([]() { llgs::terminate_debugger(); });
-    return main_gdbserver(argc, argv);
-  }
-  case 'p': {
+    main_gdbserver(argc, argv);
+    llgs::terminate_debugger();
+    break;
+  case 'p':
     llgs::initialize();
-    auto deinit = llvm::make_scope_exit([]() { llgs::terminate_debugger(); });
-    return main_platform(argc, argv);
-  }
-  case 'v': {
+    main_platform(argc, argv);
+    llgs::terminate_debugger();
+    break;
+  case 'v':
     fprintf(stderr, "%s\n", lldb_private::GetVersion());
-    return 0;
-  }
-  default: {
+    break;
+  default:
     display_usage(progname);
-    return 1;
-  }
+    exit(option_error);
   }
 }