; * src/w32.c (init_ntproc): Fix formatting conventions in last change.

(cherry picked from commit 944e45db53cb173c5eadd4794081c133e8649d67)

diff --git a/src/w32.c b/src/w32.c
index 0c1291f10943cdf40cf28cb233f0a001bf8236a6..cec15606bf2809cf0dae3ae06d5c79527c7c3e3d 100644 (file)
--- a/src/w32.c
+++ b/src/w32.c
@@ -10482,14 +10482,19 @@ init_ntproc (int dumping)
   {
 
 #ifdef _UCRT
-    /* For UCRT, the _fdopen will try to find free stream from
-       _IOB_ENTRIES (= 3), thus we can't reopen the standard handles
-       with it. Using SetHandleInformation to make the handle not
-       inheritable to child process is a better way. */
-    SetHandleInformation (GetStdHandle(STD_INPUT_HANDLE), HANDLE_FLAG_INHERIT, 0);
-    SetHandleInformation (GetStdHandle(STD_OUTPUT_HANDLE), HANDLE_FLAG_INHERIT, 0);
-    SetHandleInformation (GetStdHandle(STD_ERROR_HANDLE), HANDLE_FLAG_INHERIT, 0);
-#else
+    /* The non-UCRT code below relies on MSVCRT-only behavior, whereby
+       _fdopen reuses the first unused FILE slot, whereas UCRT skips the
+       first 3 slots, which correspond to stdin/stdout/stderr.  That
+       makes it impossible in the UCRT build to open these 3 streams
+       once they are closed.  So we use SetHandleInformation instead,
+       which is available on all versions of Windows that have UCRT.  */
+    SetHandleInformation (GetStdHandle(STD_INPUT_HANDLE),
+                         HANDLE_FLAG_INHERIT, 0);
+    SetHandleInformation (GetStdHandle(STD_OUTPUT_HANDLE),
+                         HANDLE_FLAG_INHERIT, 0);
+    SetHandleInformation (GetStdHandle(STD_ERROR_HANDLE),
+                         HANDLE_FLAG_INHERIT, 0);
+#else  /* !_UCRT */
     HANDLE parent;
     HANDLE stdin_save =  INVALID_HANDLE_VALUE;
     HANDLE stdout_save = INVALID_HANDLE_VALUE;
@@ -10497,8 +10502,8 @@ init_ntproc (int dumping)
 
     parent = GetCurrentProcess ();
 
-    /* ignore errors when duplicating and closing; typically the
-       handles will be invalid when running as a gui program. */
+    /* Ignore errors when duplicating and closing; typically the
+       handles will be invalid when running as a gui program.  */
     DuplicateHandle (parent,
                     GetStdHandle (STD_INPUT_HANDLE),
                     parent,
@@ -10544,7 +10549,7 @@ init_ntproc (int dumping)
     else
       _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
     _fdopen (2, "w");
-#endif
+#endif /* !_UCRT */
   }
 
   /* unfortunately, atexit depends on implementation of malloc */