posix: Added option to disable signal handlers

See https://github.com/chromiumembedded/java-cef/issues/477

include/internal/cef_types.h

@@ -514,6 +514,13 @@ typedef struct _cef_settings_t {
   /// runtime on Windows.
   ///
   int chrome_app_icon_id;
+
+#if defined(OS_POSIX) && !defined(OS_ANDROID)
+  ///
+  /// Specify whether signal handlers must be disabled on POSIX systems.
+  ///
+  bool disable_signal_handlers;
+#endif
 } cef_settings_t;
 
 ///

include/internal/cef_types_wrappers.h

@@ -437,6 +437,10 @@ struct CefSettingsTraits {
     cef_string_set(src->chrome_policy_id.str, src->chrome_policy_id.length,
                    &target->chrome_policy_id, copy);
     target->chrome_app_icon_id = src->chrome_app_icon_id;
+
+#if defined(OS_POSIX) && !defined(OS_ANDROID)
+    target->disable_signal_handlers = src->disable_signal_handlers;
+#endif
   }
 };
 

libcef/browser/main_runner.cc

@@ -277,7 +277,13 @@ bool CefMainRunner::Initialize(CefSettings* settings,
       this, settings, application);
 
   exit_code_ =
-      ContentMainInitialize(args, windows_sandbox_info, &settings->no_sandbox);
+      ContentMainInitialize(args, windows_sandbox_info, &settings->no_sandbox,
+#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_ANDROID)
+                            settings->disable_signal_handlers
+#else
+                            false
+#endif
+      );
   if (exit_code_ >= 0) {
     LOG(ERROR) << "ContentMainInitialize failed with exit code " << exit_code_;
     return false;
@@ -429,7 +435,8 @@ int CefMainRunner::RunAsHelperProcess(const CefMainArgs& args,
 
 int CefMainRunner::ContentMainInitialize(const CefMainArgs& args,
                                          void* windows_sandbox_info,
-                                         int* no_sandbox) {
+                                         int* no_sandbox,
+                                         bool disable_signal_handlers) {
   main_delegate_->BeforeMainThreadInitialize(args);
 
   // Initialize the content runner.
@@ -452,6 +459,10 @@ int CefMainRunner::ContentMainInitialize(const CefMainArgs& args,
   main_params.argv = const_cast<const char**>(args.argv);
 #endif
 
+#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_ANDROID)
+  main_params.disable_signal_handlers = disable_signal_handlers;
+#endif
+
   return content::ContentMainInitialize(std::move(main_params),
                                         main_runner_.get());
 }

libcef/browser/main_runner.h

@@ -60,7 +60,9 @@ class CefMainRunner : public CefMainRunnerHandler {
   // Called from Initialize().
   int ContentMainInitialize(const CefMainArgs& args,
                             void* windows_sandbox_info,
-                            int* no_sandbox);
+                            int* no_sandbox,
+                            bool disable_signal_handlers);
+
   int ContentMainRun(bool* initialized, base::OnceClosure context_initialized);
 
   // CefMainRunnerHandler methods:

patch/patches/content_main_654986.patch

@@ -12,7 +12,7 @@ index 79ba3ac1913f8..46bcb4366d2f8 100644
    if (main_argv)
      setproctitle_init(main_argv);
 diff --git content/app/content_main.cc content/app/content_main.cc
-index 96c28a7ce3183..3d60ab170e9a5 100644
+index 96c28a7ce3183..8a396ce7adf86 100644
 --- content/app/content_main.cc
 +++ content/app/content_main.cc
 @@ -174,11 +174,8 @@ ContentMainParams::~ContentMainParams() = default;
@@ -39,7 +39,18 @@ index 96c28a7ce3183..3d60ab170e9a5 100644
  
    // A flag to indicate whether Main() has been called before. On Android, we
    // may re-run Main() without restarting the browser process. This flag
-@@ -274,14 +268,6 @@ RunContentProcess(ContentMainParams params,
+@@ -266,7 +260,9 @@ RunContentProcess(ContentMainParams params,
+     // default, "C", locale.
+     setlocale(LC_NUMERIC, "C");
+ 
+-    SetupSignalHandlers();
++    if (!params.disable_signal_handlers) {
++      SetupSignalHandlers();
++    }
+ #endif
+ 
+ #if BUILDFLAG(IS_WIN)
+@@ -274,14 +270,6 @@ RunContentProcess(ContentMainParams params,
  #endif
  
  #if BUILDFLAG(IS_MAC)
@@ -54,7 +65,7 @@ index 96c28a7ce3183..3d60ab170e9a5 100644
      InitializeMac();
  #endif
  
-@@ -329,12 +315,46 @@ RunContentProcess(ContentMainParams params,
+@@ -329,12 +317,46 @@ RunContentProcess(ContentMainParams params,
  
    if (IsSubprocess())
      CommonSubprocessInit();
@@ -149,10 +160,22 @@ index cbbc2f3ec12fa..f097b3cdded2f 100644
    int RunBrowser(MainFunctionParams main_function_params,
                   bool start_minimal_browser);
 diff --git content/public/app/content_main.h content/public/app/content_main.h
-index 7f9b515297357..89b52e34fa31a 100644
+index 7f9b515297357..5606867e43780 100644
 --- content/public/app/content_main.h
 +++ content/public/app/content_main.h
-@@ -94,6 +94,13 @@ struct CONTENT_EXPORT ContentMainParams {
+@@ -66,6 +66,11 @@ struct CONTENT_EXPORT ContentMainParams {
+   // are left uninitialized.
+   bool minimal_browser_mode = false;
+ 
++#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_ANDROID)
++  // Indicates whether to disable signal handlers
++  bool disable_signal_handlers = false;
++#endif
++
+ #if BUILDFLAG(IS_MAC)
+   // The outermost autorelease pool to pass to main entry points.
+   STACK_ALLOCATED_IGNORE("https://crbug.com/1424190")
+@@ -94,6 +99,13 @@ struct CONTENT_EXPORT ContentMainParams {
    }
  };