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Date: Wed, 28 Oct 2015 10:10:23 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: gawk: Bad File Descriptor error with concurrent readonly access to a network file
Message-ID: <20151028091023.GX5319@calimero.vinschen.de>
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References: <AB495CE313664A489959F8DEF45069A90188AA3118 AT EXSRV01 DOT avt-imst DOT local>
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On Oct 27 23:30, Vermessung AVT - Wolfgang Rieger wrote:
> From: Corinna Vinschen [mailto:corinna-cygwin AT cygwin DOT com]
> Sent: Tuesday, October 27, 2015 10:53
> To: cygwin AT cygwin DOT com
> Subject: Re: gawk: Bad File Descriptor error with concurrent readonly acc=
ess to a network file
>  (Snip)
> > Cygwin uses full sharing for all files it opens, unless the file is ope=
ned in very specific circumstances (e.g, creating a symlink,
> > deleting a file).  "Bad file descriptor" doesn't point to a sharing pro=
blem.
> > It seems the handle is unusable or something.
> >
> > I tried your testcase and I can't reproduce the problem in my environme=
nt.
> > Have you tried catching a trace of the problem via strace?
> > It would be helpful to see where the EBADF occurs.
>=20
> Here is the portion of strace output where IMHO the error occurs. The beh=
aviour is quite different when running with strace, so I hope it is the sam=
e error situation, but at least the message given is "Bad file descriptor".
> I changed the paths to ???. This is strace --mask=3Dsyscall. If you need =
further info I would appreciate to send it directly to you since there is a=
 lot of info in strace I do not want to put into the www:
>=20
>   197   70416 [main] gawk 3844 open: 3 =3D open(???\datafile.txt, 0x8000)
>   327   70743 [main] gawk 3844 fcntl64: 0 =3D fcntl(3, 1, 0x0)
>   265   71008 [main] gawk 3844 fcntl64: 0 =3D fcntl(3, 2, 0x1)
>  3298   74306 [main] gawk 3844 fhandler_base::fstat_helper: 0 =3D fstat (=
\??\???\datafile.txt, 0x8004AEF8) st_size=3D135, st_mode=3D0100644, st_ino=
=3D281474976912276st_atim=3D551A9D6D.BD48F54 st_ctim=3D5603C3F5.26F49798 st=
_mtim=3D54E1ECAE.B2A66C8 st_birthtim=3D551A9D6D.BD48F54
>   206   74512 [main] gawk 3844 fstat64: 0 =3D fstat(3, 0x8004AEF8)
>   216   74728 [main] gawk 3844 isatty: 0 =3D isatty(3)
>  1887   76615 [main] gawk 3844 fhandler_base::fstat_helper: 0 =3D fstat (=
\??\???\datafile.txt, 0x8004AEF8) st_size=3D135, st_mode=3D0100644, st_ino=
=3D281474976912276st_atim=3D551A9D6D.BD48F54 st_ctim=3D5603C3F5.26F49798 st=
_mtim=3D54E1ECAE.B2A66C8 st_birthtim=3D551A9D6D.BD48F54
>   241   76856 [main] gawk 3844 fstat64: 0 =3D fstat(3, 0x8004AEF8)
>   304   77160 [main] gawk 3844 read: read(3, 0x8004AF90, 135) blocking
>  1722   78882 [main] gawk 3844 seterrno_from_nt_status: /home/corinna/src=
/cygwin/cygwin-1.7.33/cygwin-1.7.33-1.i686/src/src/winsup/cygwin/fhandler.c=
c:276 status 0xC0000128 -> windows error 6

0xC0000128 is STATUS_FILE_CLOSED.  "Something" closed the handle.
This is only the result, unfortunately.  It doesn't tell us anything
in terms of the cause.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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