Adjust buffer sizes.

[nssm.git] / process.cpp

diff --git a/process.cpp b/process.cpp
index 1cc6a73..19b893a 100644 (file)
--- a/process.cpp
+++ b/process.cpp
@@ -306,3 +306,39 @@ void kill_process_tree(nssm_service_t *service, unsigned long pid, unsigned long
 
   CloseHandle(process_handle);
 }
+
+/*
+  Verify an environment block.
+  Returns:  1 if environment is invalid.
+            0 if environment is OK.
+           -1 on error.
+*/
+int test_environment(TCHAR *env) {
+  TCHAR path[PATH_LENGTH];
+  GetModuleFileName(0, path, _countof(path));
+  STARTUPINFO si;
+  ZeroMemory(&si, sizeof(si));
+  si.cb = sizeof(si);
+  PROCESS_INFORMATION pi;
+  ZeroMemory(&pi, sizeof(pi));
+  unsigned long flags = CREATE_SUSPENDED;
+#ifdef UNICODE
+  flags |= CREATE_UNICODE_ENVIRONMENT;
+#endif
+
+  /*
+    Try to relaunch ourselves but with the candidate environment set.
+    Assuming no solar flare activity, the only reason this would fail is if
+    the environment were invalid.
+  */
+  if (CreateProcess(0, path, 0, 0, 0, flags, env, 0, &si, &pi)) {
+    TerminateProcess(pi.hProcess, 0);
+  }
+  else {
+    unsigned long error = GetLastError();
+    if (error == ERROR_INVALID_PARAMETER) return 1;
+    else return -1;
+  }
+
+  return 0;
+}