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Date: Mon, 12 Apr 1999 21:04:38 -0400
From: Chris Faylor <cgf AT cygnus DOT com>
To: Mumit Khan <khan AT xraylith DOT wisc DOT EDU>
Cc: cygwin-developers AT sourceware DOT cygnus DOT com
Subject: Re: struct stat st_dev question
Message-ID: <19990412210438.D2833@cygnus.com>
References: <199904122339 DOT SAA16654 AT modi DOT xraylith DOT wisc DOT edu> <19990412210155 DOT C2833 AT cygnus DOT com>
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In-Reply-To: <19990412210155.C2833@cygnus.com>; from Chris Faylor on Mon, Apr 12, 1999 at 09:01:55PM -0400

On Mon, Apr 12, 1999 at 09:01:55PM -0400, Chris Faylor wrote:
>Hmm.  st_dev should be a disk's volume serial number, at least
>from my reading of the code in fhandler.cc.
>
>If it's always returning 4096, that's a bug.

Actually recent snapshots do not return 4096.

-chris

>On Mon, Apr 12, 1999 at 06:39:13PM -0500, Mumit Khan wrote:
>>I'm trying to debug a problem with egcs and the causes seems to be the
>>fact that the st_dev member of struct stat is always set to 4096. This 
>>is with Cygwin b20.1 DLL (and needs to be since egcs-1.2 needs to work
>>with b20.1 as well as any future release). Can anyone confirm if this 
>>is indeed intended? 
>>
>>Here's a simple test case:
>>
>>=== cut here
>>
>>  #include <sys/types.h>
>>  #include <sys/stat.h>
>>  #include <stdio.h>
>>
>>  int main (int argc, char *argv[]) {
>>    const char *path = (argc >= 2) ? argv[1] : "/";
>>    struct stat s;
>>    int i = stat (path, &s);
>>    printf ("stat (%s) = %d\n", path, i);
>>    printf ("inode = %d\n", s.st_ino);
>>    printf ("%s.st_dev = %d\n", path, s.st_dev);
>>
>>    return 0;
>>  }
>>
>>=== to here
>>
>>  $ ./stdev-test-cyg / 
>>  stat (/) = 0
>>  inode = 22896814
>>  /.st_dev = 4096
>>  $ ./stdev-test-cyg //d
>>  stat (//d) = 0
>>  inode = 22642860
>>  //d.st_dev = 4096
>>  $ ./stdev-test-cyg //u 
>>  stat (//u) = 0
>>  inode = 13213796
>>  //u.st_dev = 4096
>>
>>Microsoft's runtime does report different device id's.

-- 
cgf AT cygnus DOT com
http://www.cygnus.com/