Running the tests continuously I noticed that sometimes the sigpipe
test would fail due to a race between the control message of the test
and the vsock transport messages.

While I was at it I also improved the test by checking the errno we
expect.

Changelog:
v2:
- added a patch to provide timeout_usleep() and avoid issues with signals
  in timeout section
- add little sleep to avoid flooding the other peer [Paolo]
- fixed loop exit condition [Paolo]

v1: https://lore.kernel.org/netdev/20250508142005.135857-1-sgarzare@redhat.com/

Stefano Garzarella (3):
  vsock/test: add timeout_usleep() to allow sleeping in timeout sections
  vsock/test: retry send() to avoid occasional failure in sigpipe test
  vsock/test: check also expected errno on sigpipe test

 tools/testing/vsock/timeout.h    |  1 +
 tools/testing/vsock/timeout.c    | 18 +++++++++++++
 tools/testing/vsock/vsock_test.c | 46 ++++++++++++++++++++++++++------
 3 files changed, 57 insertions(+), 8 deletions(-)

-- 
2.49.0