[Bug 181741] Packet loss when 'control' messages are present with large data (sendmsg(2))

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181741

--- Comment #22 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Sat Aug  4 20:29:58 UTC 2018
New revision: 337329
URL: https://svnweb.freebsd.org/changeset/base/337329

Log:
  Fix the regression test for PR 181741.

  With r337328, the test hangs becase the sendmsg() call will block until
  the receive buffer is at least partially drained.  Fix the problem by
  using a non-blocking socket and allowing short writes.  Also assert
  that a SCM_CREDS message was received if one was expected.

  PR:           181741
  MFC after:    1 month
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D16516

Changes:
  head/tests/sys/kern/unix_passfd_test.c

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