Ladybird+LibWebView: Add ProcessManager to track live processes

This model will be used to add a Processes tab to the inspector.
Author: https://github.com/ADKaster Commit: 096feaaeb8 Pull-request: https://github.com/SerenityOS/serenity/pull/23745 Reviewed-by: https://github.com/alimpfard Reviewed-by: https://github.com/trflynn89
2025-10-04 23:29:52 +00:00 · 2024-03-25 18:29:14 -06:00 · 2024-03-25 18:29:14 -06:00 · 096feaaeb8 · 2024-07-16 20:08:14 +09:00
commit 096feaaeb8
parent e66a4668f9
9 changed files with 193 additions and 2 deletions
--- a/Userland/Libraries/LibWebView/ProcessManager.cpp
+++ b/Userland/Libraries/LibWebView/ProcessManager.cpp
@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/EventLoop.h>
+#include <LibCore/System.h>
+#include <LibWebView/ProcessManager.h>
+
+namespace WebView {
+
+static sig_atomic_t s_received_sigchld = 0;
+
+ProcessType process_type_from_name(StringView name)
+{
+    if (name == "Chrome"sv)
+        return ProcessType::Chrome;
+    if (name == "WebContent"sv)
+        return ProcessType::WebContent;
+    if (name == "WebWorker"sv)
+        return ProcessType::WebWorker;
+    if (name == "SQLServer"sv)
+        return ProcessType::SQLServer;
+    if (name == "RequestServer"sv)
+        return ProcessType::RequestServer;
+    if (name == "ImageDecoder"sv)
+        return ProcessType::ImageDecoder;
+
+    dbgln("Unknown process type: '{}'", name);
+    VERIFY_NOT_REACHED();
+}
+
+StringView process_name_from_type(ProcessType type)
+{
+    switch (type) {
+    case ProcessType::Chrome:
+        return "Chrome"sv;
+    case ProcessType::WebContent:
+        return "WebContent"sv;
+    case ProcessType::WebWorker:
+        return "WebWorker"sv;
+    case ProcessType::SQLServer:
+        return "SQLServer"sv;
+    case ProcessType::RequestServer:
+        return "RequestServer"sv;
+    case ProcessType::ImageDecoder:
+        return "ImageDecoder"sv;
+    }
+    VERIFY_NOT_REACHED();
+}
+
+ProcessManager::ProcessManager()
+{
+}
+
+ProcessManager::~ProcessManager()
+{
+}
+
+ProcessManager& ProcessManager::the()
+{
+    static ProcessManager s_the;
+    return s_the;
+}
+
+void ProcessManager::initialize()
+{
+    // FIXME: Should we change this to call EventLoop::register_signal?
+    //        Note that only EventLoopImplementationUnix has a working register_signal
+
+    struct sigaction action { };
+    action.sa_flags = SA_RESTART;
+    action.sa_sigaction = [](int, auto*, auto) {
+        s_received_sigchld = 1;
+    };
+
+    MUST(Core::System::sigaction(SIGCHLD, &action, nullptr));
+
+    the().add_process(WebView::ProcessType::Chrome, getpid());
+}
+
+void ProcessManager::add_process(ProcessType type, pid_t pid)
+{
+    dbgln("ProcessManager::add_process({}, {})", process_name_from_type(type), pid);
+    m_processes.append({ type, pid, 0, 0 });
+}
+
+void ProcessManager::remove_process(pid_t pid)
+{
+    m_processes.remove_first_matching([&](auto& info) {
+        if (info.pid == pid) {
+            dbgln("ProcessManager: Remove process {} ({})", process_name_from_type(info.type), pid);
+            return true;
+        }
+        return false;
+    });
+}
+
+void ProcessManager::update_all_processes()
+{
+    if (s_received_sigchld) {
+        s_received_sigchld = 0;
+        auto result = Core::System::waitpid(-1, WNOHANG);
+        while (!result.is_error() && result.value().pid > 0) {
+            auto& [pid, status] = result.value();
+            if (WIFEXITED(status) || WIFSIGNALED(status)) {
+                remove_process(pid);
+            }
+            result = Core::System::waitpid(-1, WNOHANG);
+        }
+    }
+
+    // FIXME: Actually gather stats in a platform-specific way
+}
+
+}