Re: Problems with current file descriptor

[Sergio Paracuellos <sparacuellos@lock-linux.com>]

El jue, 27-10-2005 a las 11:06 +0200, Sergio Paracuellos escribió:
> El jue, 27-10-2005 a las 16:30 +0800, winter escribió:
> > 2005/10/27, Sergio Paracuellos <sparacuellos@lock-linux.com>:
> > > > current file ?what is meaning?
> > > > for exmaple ,you opened 3 file, file1,file2, file3. which is current file?
> > >
> > > Sorry, I want the last file I used. For example if I just have done "cat
> > > foobar" the file I want is this.
> > >
> > if you used the command "cat foobar", the linux kernel's do the
> > following 3 phase for you:
> >   1. open() --> sys_open()  // in this phase, the filp struct is
> > create and save at
> >                                         // current->files->fd[x]. the x=fd.
> >   2. read() --> sys_read()    // in this phase, read file's data, the
> > fd is not changed.
> >   3. close() --> sys_close() // in this phase, free the filp struct.
> > the result is
> >                                        // current->files->fd[fd] = 0.
> > so it is, kernel can not save the last file which you opend.
> > which  phase you want get the path at?
> 
> The problem is I need to get complete path in lookup(). Lookup is the
> first thig kernel execute and in lookup I can't get complete path
> because I have a dentry structure...
> 
> cat foobar was an example I need to get the path in other operations too
> like "write..." but always in lookup function.
> 
> Any ideas about it?
> 
> Thanks in advance,
> 
> 	Sergio

I solve my problem. I was wrong in my code. I was using like dentry
current->fs->pwd but I had to use the dentry in use in lookup function.

Thanks to all. 

Cheers,
        Sergio

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