win32: Update stdout/stderr redirection

src/arch/win32/main.cpp

@@ -181,23 +181,26 @@ static int convertArguments(int argc, wchar_t *argw[], std::vector<std::string>
 }
 
 // Modified from https://stackoverflow.com/a/21376268
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
 static std::vector<int> s_fdesc;
 static void startRedirection(const char *fname, FILE *fstream, std::vector<int> &fdesc) {
   // Duplicate stdout/stderr and give it a new file descriptor
-  int i = _dup(_fileno(fstream));
+  int i = _dup(fstream == stdout ? STDOUT_FILENO : STDERR_FILENO);
   fdesc.push_back(i);
 
   // Re-open stdout/stderr to the new file
-  freopen(fname, "w", fstream);
-
-  DEVLOG_INFO("Redirection std%s to file started\n", fstream == stdout ? "out" : "err");
+  if (std::freopen(fname, "w", fstream)) {
+    DEVLOG_INFO("Redirection std%s to file started\n", fstream == stdout ? "out" : "err");
+  }
 }
 
 static bool stopRedirection(FILE *fstream, std::vector<int> &fdesc) {
   if (fdesc.size() != 0) {
     // Get last saved file descriptor and restore it
     int i = fdesc.back();
-    _dup2(i, _fileno(fstream));
+    _dup2(i, fstream == stdout ? STDOUT_FILENO : STDERR_FILENO);
 
     // Need to close the file associated with the saved file descriptor
     _close(i);