Re: how can i get file name knowing its descriptor?
On 2008-Jul-03 14:08:12 +0300, Uladzislau Rezki <[EMAIL PROTECTED]> wrote: >I've been writing a small kernel module, that provides information about >modification of the filesystem to user_land/userspace through the >character device. I'm using FreeBSD 4.10 4.10 has not been supported for several years now. I strongly recommend you look at upgrading to at least 6.3. >So, my question is: Is there any way to get file name knowing its descriptor? The simple answer is no. That said, you could try having a look at how lsof works (whilst it runs in userland, it needs to grovel around in the kernel datastructures much the same as your module would need to. -- Peter Jeremy Please excuse any delays as the result of my ISP's inability to implement an MTA that is either RFC2821-compliant or matches their claimed behaviour. pgpvMoGfEnFHe.pgp Description: PGP signature
how can i get file name knowing its descriptor?
Hi all,
I've been writing a small kernel module, that provides information about
modification of the filesystem to user_land/userspace through the
character device. I'm using FreeBSD 4.10
So, my question is: Is there any way to get file name knowing its descriptor?
static int
xxx_write (struct proc *p, struct write_args *uap)
{
struct vnode *vn;
struct file *file;
int sys_error;
/* do system call */
sys_error = write(p, uap);
if (sys_error != 0)
goto leave_call;
/* get the file */
file = curproc->p_fd->fd_ofiles[uap->fd];
/* get the vnode */
vn = (struct vnode *) file->f_data;
/* do we have a regular */
if (vn->v_type == VREG) {
...
...
...
}
As you can see we just know uap->fd.
BTW, it would be fine to get a few web resources concerning FreeBSD
kernel programming.
Thanks.
--
Uladzislau Rezki
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