Squash commits for public release

userland/servers/launch_server/Exec.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <csignal>
+#include <string>
+#include <unistd.h>
+#include <vector>
+
+namespace LaunchServer {
+
+class Exec {
+public:
+    enum Flags {
+        None = 0,
+        RestartOnFail = (1 << 0),
+    };
+
+    Exec(const std::string& path, Flags flag = Flags::None)
+        : m_path(path)
+        , m_flags(flag)
+    {
+    }
+    ~Exec() = default;
+
+    void launch()
+    {
+        m_pid = fork();
+        if (m_pid == 0) {
+            execlp(m_path.c_str(), m_path.c_str(), NULL);
+            std::abort();
+        }
+    }
+
+    bool is_alive() const { return m_pid > 0 && kill(m_pid, 0) == 0; }
+
+private:
+    std::string m_path;
+    Flags m_flags;
+    int m_pid { -1 };
+};
+
+}