New proc entry under /proc/[pid]

[Mauro Romano Trajber]

Following your recommendations parent->pde always returns NULL. You know why
?

// code...
err = kern_path("/proc/1/", LOOKUP_FOLLOW, &path);
 if (err) {
return err;
}
 struct proc_inode *parent = PROC_I(path.dentry->d_inode);
struct proc_dir_entry *parent_dir = parent->pde;
 if (parent_dir == NULL) {
printk("parent_dir is NULL\n");
} else {
 create_proc_entry("SOMEFile", 0644, parent_dir);
}


Mauro!

On Tue, Jan 11, 2011 at 4:39 AM, Rajat Sharma <fs.rajat at gmail.com> wrote:

> Try this:
> 1. do a path_lookup for parent proc dir e.g. /proc/1234 and get its inode.
> 2. get proc_inode structure for parent from vfs inode like this:
>          sruct proc_inode *parent = PROC_I(inode).
>    PROC_I is defined in proc_fs.h
> 3. get parent proc_dir_entry object:
>          struct proc_dir_entry *parent_dir = parent->pde;
> 4. now you can call:
>          create_proc_entry("SOME file", 0644, parent_dir);
> 5. or you can create a directory if you want:
>          proc_mkdir("your dir", parent_dir);
>
> hope this helps.
>
> Rajat
>
> On Tue, Jan 11, 2011 at 12:19 AM, Mauro Romano Trajber
> <trajber at gmail.com> wrote:
> > I think I found:
> > static const struct pid_entry tgid_base_stuff[] at fs/proc/base.c has all
> > /proc/[pid] entries.
> > But unfortunately it does not use create_proc_entry function, and I'm
> trying
> > to create a new syscall that creates a new proc_entry for the caller
> > process.
> > Adding a new element in tgid_base_stuff[] makes the things more
> complicated
> > than simply call a create_proc_entry function.
> > Is there another way to do it ?
> > Mauro Romano Trajber
> >
> > On Mon, Jan 10, 2011 at 3:18 PM, Mauro Romano Trajber <trajber at gmail.com
> >
> > wrote:
> >>
> >> How can I create a new proc entry under /proc/[pid] ?
> >> I using create_proc_entry("SOME_FILE", 0644, NULL /* here goes the pid
> >> proc entry */);
> >> Is there any way to get PID directory as a parent proc entry ? How ?
> >> Thanks,
> >> Mauro
> >
> > _______________________________________________
> > Kernelnewbies mailing list
> > Kernelnewbies at kernelnewbies.org
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> >
> >
>
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