linux-kernel - getting mysterious (to me) EINVAL from inotify_rm

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Message-ID: <20160511142251.GA30812@qarx.de>
Date:	Wed, 11 May 2016 16:22:51 +0200
From:	Felix von Leitner <felix-linuxkernel@...e.de>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: getting mysterious (to me) EINVAL from inotify_rm_watch

Hi,

I am trying to add inotify support to my tail implementation (for -F).
This is what happens:

  inotify_init()                          = 4
  inotify_add_watch(4, "/tmp/foo", IN_MODIFY) = 1
  inotify_rm_watch(4, 1)                  = -1 EINVAL (Invalid argument)
  inotify_add_watch(4, "/tmp/foo", IN_MODIFY) = 2

There is also some polling, some reading and some statting going on here, but
those are on other descriptors than 4 so they should not matter).

Can somebody explain the EINVAL I'm getting from inotify_rm_watch to me?

This is a stock kernel 4.5.0.

Thanks,

Felix