Date: Fri, 8 Jan 2016 09:00:03 +0800 (PHT) From: Paul Goyette <p...@whooppee.com>
On Fri, 8 Jan 2016, Paul Goyette wrote: > The saga continues! :) > > <snip> > > Next, I'm going to have a look at fd_getfile2()/fclose() and see if that > is a viable approach. Hmmm. The comments in kern/kern_descrip.c for fd_getfile2() require that the process is not allowed to fork or exit "across this call" (which I assume means "until the reference to the struct file is released"). I don't think that's what it means. I think it means the process whose descriptor we're asking for can't fork or exit *during the call* to fd_getfile2. In this case, it's the current process, so that's not an issue. The reason it is an issue stated in a comment is that the routine appears to have been written for the purpose of procfs, in which case the calling process is often not the same as the process passed to fd_getfile2.