yes you are right, it gives NULL for <pid> directories under proc but
I tried changing pid to something else, say /proc/sys and it works.
Looks like handling of pid directories is entirely different. I didn't
get time to explore on that, will have to dig more into this.

Rajat

On Wed, Jan 12, 2011 at 12:50 AM, Mauro Romano Trajber
[off-list ref] wrote:

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 [off-list ref] wrote:

quoted

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
[off-list ref] wrote:

quoted

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
[off-list ref]
wrote:

quoted

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

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