Re: init_buffer PWD fix

["Keiichiro Nagano" <knagano@sodan.org>]

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At Sun, 21 Apr 2002 23:18:38 -0700 (PDT),
Paul Eggert wrote:
> > init_buffer uses environmental variable PWD to identify current
> > working directory.  I think we should not use it on Windows.  On
> > Windows with Cygwin, PWD is unreliable and confusing
> 
> PWD is unreliable on all platforms, but Emacs works around the problem
> with a similar method on all platforms by statting $PWD and ".", and
> using $PWD only if stat results agree.  What is the problem with
> this workaround on Windows?

You cannot get st_ino which makes sence (without cygwin1.dll).
Compile stattest.c on Windows by MSVC (cl.exe), and you will see:

----
$ ./stattest
stattest.c: 0
stattest.exe: 0
.: 0
..: 0
C:\: 0
C:\WINNT: 0
nonexist: stat failed
----

I wrote, compiled and run this code on Windows 2000 SP2 SRP1 with NTFS
partition.

-- 
Keiichiro Nagano



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/* compile: cl stattest.c */

#include <stdio.h>
#include <sys/stat.h>

void
print_ino (char *target)
{
  struct stat statbuf;
  if (stat (target, &statbuf) == 0)
    printf ("%s: %d\n", target, statbuf.st_ino);
  else
    printf ("%s: stat failed\n", target);
}

int
main (void)
{
  print_ino ("stattest.c");
  print_ino ("stattest.exe");
  print_ino (".");
  print_ino ("..");
  print_ino ("C:\\");
  print_ino ("C:\\WINNT");
  print_ino ("nonexist");
  return 0;
}