Date: Tue, 3 Jul 2007 22:59:22 +0200 From: "Pascal Hofstee" <caelian@gmail.com> To: current <current@freebsd.org> Subject: Re: ZFS vs Samba Debugging Results ... Need Help. Message-ID: <d8a0b7620707031359wc178fdfocf2387820fcacbf5@mail.gmail.com> In-Reply-To: <d8a0b7620707031331w5b0fcae2jd96cb7ff8b3f34d6@mail.gmail.com> References: <d8a0b7620707031331w5b0fcae2jd96cb7ff8b3f34d6@mail.gmail.com>
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On 7/3/07, Pascal Hofstee <caelian@gmail.com> wrote:
> I include the function implementation in question for convenience here:
>
> char *vfs_readdirname(connection_struct *conn, void *p)
> {
> SMB_STRUCT_DIRENT *ptr= NULL;
> char *dname;
>
> if (!p)
> return(NULL);
>
> ptr = SMB_VFS_READDIR(conn, (DIR *)p);
> if (!ptr)
> return(NULL);
>
> dname = ptr->d_name;
>
> #ifdef NEXT2
> if (telldir(p) < 0)
> return(NULL);
> #endif
>
> #ifdef HAVE_BROKEN_READDIR_NAME
> /* using /usr/ucb/cc is BAD */
> dname = dname - 2;
> #endif
>
> return(dname);
> }
I hate following up on my own posts especially several minutes after
the original.
I just realised that i overlooked one detail in my original debugging
session which entirely explains what's happening ...
Below is a walk-through of my debugging session:
Breakpoint 1, vfs_readdirname (conn=0x20a25030, p=0x20a0e000) at smbd/vfs.c:628
628 if (!p)
(gdb) next
631 ptr = SMB_VFS_READDIR(conn, (DIR *)p);
(gdb)
632 if (!ptr)
(gdb) print ptr
$3 = (struct dirent *) 0x20a0e014
(gdb) print dname
$4 = 0x20a0e014 "\003"
(gdb) next
647 return(dname);
It looks like somehow gcc optimized out the actual assignment of dname !
With kind regards,
--
Pascal Hofstee
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