✨ Linux and Mac implementation

src/spawn_process.cpp

@@ -5,18 +5,18 @@
 namespace {
 
 #if defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
 std::string GetLastErrorAsString()
 {
     DWORD errorMessageID = ::GetLastError();
     if (errorMessageID == 0)
-    {
         return "No error";
-    }
 
     LPSTR messageBuffer = nullptr;
 
+    // TODO is this implementation safe ? no strings too long ?
     size_t size = FormatMessageA(
         FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
         NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
@@ -25,9 +25,7 @@ std::string GetLastErrorAsString()
 
     std::string message(messageBuffer, size);
 
-    // Free the buffer allocated by FormatMessage
     LocalFree(messageBuffer);
-
     return message;
 }
 
@@ -47,6 +45,27 @@ auto spawn_process_impl(std::filesystem::path const& executable_absolute_path) -
 }
 
 #elif defined(__linux__) || defined(__APPLE__)
+#include <unistd.h>
+#include <sys/types.h>
+#include <cerrno>
+#include <cstring>
+
+auto spawn_process_impl(std::filesystem::path const& executable_absolute_path) -> std::optional<std::string>
+{
+    pid_t pid = fork();
+
+    if (pid < 0)
+    {
+        // Fork failed
+        std::cerr << "Fork failed: " << strerror(errno) << std::endl;
+    }
+    else if (pid == 0)
+    {
+        // In child process:
+        execl(executable_absolute_path.string().c_str(), executable_absolute_path.string().c_str(), nullptr);
+        _exit(1); // Ensure the child process exits
+    }
+}
 
 #else
 #error "Unsupported platform"