Re: getting fd from pointer to sock

[Marco Cova <giardini@libero.it>]

On Wed, Aug 14, 2002 at 04:41:50PM +0530, Amit Shah wrote:
> hello,
>     i wanted to know if there is any function which can from the pointer to
> the sock structure or the pointer to the socket structure give me the
> corressponding socket descriptor value.
> Or even if it can give me the descriptor value from the pointer to the file
> structure...that would be helpful too.
> thanks,

Hi.

This is how the different data structures are related to each other:

struct task_struct --> struct files_struct * --> struct file **  -->
 (current)       (files)                    (fd)

  -->  struct dentry  --> struct inode  --> struct socket  --> struct sock
(f_dentry)         (d_inode)          (u.socket_i)        (sk)


Mmmh, not too clear? It means: you can get a pointer to a struct
files_struct through the 'files' field in the struct task_struct. From
that and its field 'fd', you can a pointer to a struct file, and so on.



HTH,
Marco


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