More Windows fixes

include/gz/utils/Subprocess.hh

@@ -40,20 +40,6 @@ namespace gz
 namespace utils
 {
 
-enum class Signals
-{
-#if defined(_WIN32)
-  CTRL_C_EVENT = 0,
-  CTRL_BREAK_EVENT = 1,
-  CTRL_CLOSE_EVENT = 2,
-  CTRL_LOGOFF_EVENT = 5,
-  CTRL_SHUTDOWN_EVENT = 6,
-#else
-  SIGNAL_SIGINT = 2,
-  SIGNAL_SIGQUIT = 3,
-#endif
-};
-
 /// \brief Create a RAII-type object that encapsulates a subprocess.
 class Subprocess
 {
@@ -214,9 +200,9 @@ class Subprocess
   {
     int signal = 0;
 #if defined(_WIN32)
-    signal = static_cast<int>(Signals::CTRL_C_EVENT);
+    signal = static_cast<int>(CTRL_C_EVENT);
 #else
-    signal = static_cast<int>(Signals::SIGNAL_SIGINT);
+    signal = static_cast<int>(SIGINT);
 #endif
     return this->Signal(signal);
   }

include/gz/utils/detail/subprocess.h

@@ -170,6 +170,17 @@ subprocess_weak int subprocess_join(struct subprocess_s *const process,
 /// the parent process.
 subprocess_weak int subprocess_destroy(struct subprocess_s *const process);
 
+/// @brief Signal a previously created process.
+/// @param process The process to signal.
+/// @param signal The signal number to send to the process.
+/// @return On success zero is returned.
+///
+/// Allows to send signals to the subprocess.  For unix-based systems,
+/// this includes any signal that appears in `kill -l`.  For Windows
+/// systems, this includes events available to GenerateConsoleCtrlEvent.
+subprocess_weak int subprocess_signal(struct subprocess_s *const process,
+                                      int signum);
+
 /// @brief Terminate a previously created process.
 /// @param process The process to terminate.
 /// @return On success zero is returned.
@@ -923,17 +934,6 @@ FILE *subprocess_stderr(const struct subprocess_s *const process) {
   }
 }
 
-int subprocess_signal(const subprocess_s *const process,
-                      int signum)
-{
-#if defined(_WIN32)
-  return GenerateConsoleCtrlEvent(signum, process->hProcess);
-#else
-  return kill(process->child, signum);
-#endif
-
-}
-
 int subprocess_join(struct subprocess_s *const process,
                     int *const out_return_code) {
 #if defined(_WIN32)
@@ -1033,6 +1033,19 @@ int subprocess_destroy(struct subprocess_s *const process) {
   return 0;
 }
 
+int subprocess_signal(const subprocess_s *const process,
+                      int signum)
+{
+  int result;
+#if defined(_WIN32)
+  auto processId = GetProcessId(process->hProcess);
+  result = GenerateConsoleCtrlEvent(signum, processId);
+#else
+  result = kill(process->child, signum);
+#endif
+  return result;
+}
+
 int subprocess_terminate(struct subprocess_s *const process) {
 #if defined(_WIN32)
   unsigned int killed_process_exit_code;