linux-kernel - [PATCH v1 0/2] pidfd: waiting on processes through pidfds

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Date:   Fri, 26 Jul 2019 11:39:32 +0200
From:   Christian Brauner <christian@...uner.io>
To:     linux-kernel@...r.kernel.org, oleg@...hat.com
Cc:     arnd@...db.de, ebiederm@...ssion.com, keescook@...omium.org,
        joel@...lfernandes.org, tglx@...utronix.de, tj@...nel.org,
        dhowells@...hat.com, jannh@...gle.com, luto@...nel.org,
        akpm@...ux-foundation.org, cyphar@...har.com,
        torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
        kernel-team@...roid.com, Christian Brauner <christian@...uner.io>
Subject: [PATCH v1 0/2] pidfd: waiting on processes through pidfds

Hey everyone,

/* v1 */
This adds the ability to wait on processes using pidfds. This is one of
the few missing pieces to make it possible to manage processes using
only pidfds.

Please note the following major changes (More details can be found in
the individual commit changelogs.):
- Add the new type P_PIDFD to waitid() instead of a new dedicated
  pidfd_wait() syscall.
  This is the same approach we discussed a few months ago and still
  prefer over adding a dedicated syscall.
- Adapt the tests to the new type P_PIDFD for waitid().
- Remove struct waitid_info patch.
  This will be sent out as a separate patch.
- Remove CLONE_WAIT_PID patch.
  This will be sent out as a separate patch.

The core patch for waitid is pleasantly small. The largest change is
caused by adding proper tests for waitid(P_PIDFD).

/* v0 */
Link: https://lore.kernel.org/lkml/20190724144651.28272-1-christian@brauner.io

Thanks!
Christian

Christian Brauner (2):
  pidfd: add P_PIDFD to waitid()
  pidfd: add pidfd_wait tests

 include/linux/pid.h                        |   4 +
 include/uapi/linux/wait.h                  |   1 +
 kernel/exit.c                              |  25 ++-
 kernel/fork.c                              |   8 +
 kernel/signal.c                            |   7 +-
 tools/testing/selftests/pidfd/pidfd.h      |  25 +++
 tools/testing/selftests/pidfd/pidfd_test.c |  14 --
 tools/testing/selftests/pidfd/pidfd_wait.c | 245 +++++++++++++++++++++
 8 files changed, 311 insertions(+), 18 deletions(-)
 create mode 100644 tools/testing/selftests/pidfd/pidfd_wait.c

-- 
2.22.0