Re: [PATCH 1/2] pid: add pidfd_open()

On 2019-05-15, Christian Brauner christian@brauner.io wrote:

On Wed, May 15, 2019 at 04:00:20PM +0200, Yann Droneaud wrote:

...

Would it be possible to create file descriptor with "restricted" operation ?

• O_RDONLY: waiting for process completion allowed (for example)
• O_WRONLY: sending process signal allowed

Yes, something like this is likely going to be possible in the future. We had discussion around this. But mapping this to O_RDONLY and O_WRONLY is not the right model. It makes more sense to have specialized flags that restrict actions.

Not to mention that the O_* flags have silly values which we shouldn't replicate in new syscalls IMHO.