Fix bug #12587 with slow startup on MS-Windows with Netlogon service.

 src/fileio.c (check_existing): New function.
 (make_temp_name, Ffile_exists_p, Ffile_writable_p): Call it
 instead of calling 'stat', when what's needed is to check whether
 a file exists.  This avoids expensive system calls on MS-Windows.
 src/w32.c (init_environment): Call 'check_existing' instead of 'stat'.
 src/lread.c (openp) [WINDOWSNT]: Call 'access' instead of 'stat' to
 determine whether a file exists and is not a directory.
 src/lisp.h (check_existing): Add prototype.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/w32.c b/src/w32.c
index b50cd13517d..15903dbceb3 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -1612,7 +1612,6 @@ init_environment (char ** argv)
     LPBYTE lpval;
     DWORD dwType;
     char locale_name[32];
-    struct stat ignored;
     char default_home[MAX_PATH];
     int appdata = 0;
 
@@ -1653,7 +1652,7 @@ init_environment (char ** argv)
     /* For backwards compatibility, check if a .emacs file exists in C:/
        If not, then we can try to default to the appdata directory under the
        user's profile, which is more likely to be writable.   */
-    if (stat ("C:/.emacs", &ignored) < 0)
+    if (check_existing ("C:/.emacs"))
       {
         HRESULT profile_result;
         /* Dynamically load ShGetFolderPath, as it won't exist on versions