Re: [RFC PATCH 0/3] introduce PIDFD_SELF

* Lorenzo Stoakes:

If you wish to utilise a pidfd interface to refer to the current process (from the point of view of userland - from the kernel point of view - the thread group leader), it is rather cumbersome, requiring something like:

int pidfd = pidfd_open(getpid(), 0);

...

close(pidfd);

Or the equivalent call opening /proc/self. It is more convenient to use a sentinel value to indicate to an interface that accepts a pidfd that we simply wish to refer to the current process.

The descriptor will refer to the current thread, not process, right?

The distinction matters for pidfd_getfd if a process contains multiple threads with different file descriptor tables, and probably for pidfd_send_signal as well.

Thanks, Florian