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Message-ID: <00a101c14031$7a3bd040$816136d5@uhs>
From: "Uwe H. Steinfeld" <usteinfeld AT gmx DOT net>
To: "Corinna Vinschen" <cygwin AT cygwin DOT com>
References: <009101c13f9d$e694a080$5c6706d5 AT uhs> <20010917135636 DOT A22751 AT redhat DOT com> <000901c13fb3$667abc20$35e606d5 AT uhs> <20010917222901 DOT I10081 AT cygbert DOT vinschen DOT de>
Subject: Re: cygwin 1.3.3 - fchdir() problem?
Date: Tue, 18 Sep 2001 12:50:12 +0200
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open (somedir, O_RDONLY) always gives error 13 (permission denied) if
somedir exists, and error 2 (no such file or directory) otherwise.

This is standard Win32 (mis-)behavior. From MS documentation:
A return value of -1 indicates an error, in which case errno is set to one
of the following values:
EACCES Tried to open read-only file for writing, or file's sharing mode does
not allow specified operations, or given path is directory

Danke
Uwe

----- Original Message -----
From: "Corinna Vinschen" <cygwin AT cygwin DOT com>
To: <cygwin AT cygwin DOT com>
Sent: Monday, September 17, 2001 10:29 PM
Subject: Re: cygwin 1.3.3 - fchdir() problem?


> On Mon, Sep 17, 2001 at 09:59:30PM +0200, Uwe H. Steinfeld wrote:
> > I tracked my problem down to the following:
> > when fchdir is defined and the directory to be created or removed is not
a
> > subdirectory of the current working directory, fileutils try to do an
> >     open (".", O_RDONLY | O_DIRECTORY)
> > and that is never successful in Cygwin/Win32.
>
> Beep! Try this:
>
>     #include <stdio.h>
>     #include <errno.h>
>     #include <sys/fcntl.h>
>
>     int
>     main (int argc, char **argv)
>     {
>       int fd;
>
>       if ((fd = open (".", O_RDONLY)) < 0)
> printf ("NOPE: %d\n", errno);
>       else
> {
>   printf ("YEP\n");
>   close (fd);
> }
>       return 0;
>     }
>
> O_DIRECTORY isn't defined on Cygwin.  According to the Linux man
> pages it's a Linux invention to avoid denial-of-service problems
> with opendir().  Especially it "should not be used outside of the
> implementation of opendir."
>
> Corinna



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