We recently found that some tests were failing [1].

The problem was that we were not waiting for all the bytes correctly,
so we had a partial read. I had initially suggested using MSG_WAITALL,
but this could have timeout problems.

Since we already had send_byte() and recv_byte() that handled the timeout,
but also the expected return value, I moved that code to two new functions
that we can now use to send/receive generic buffers.

The last commit is just an improvement to a test I found difficult to
understand while using the new functions.

@Arseniy a review and some testing are really appreciated :-)

[1] https://lore.kernel.org/netdev/63xflnwiohdfo6m3vnrrxgv2ulplencpwug5qqacugqh7xxpu3@tsczkuqgwurb/ (local)

Stefano Garzarella (5):
  vsock/test: add recv_buf() utility function
  vsock/test: use recv_buf() in vsock_test.c
  vsock/test: add send_buf() utility function
  vsock/test: use send_buf() in vsock_test.c
  vsock/test: track bytes in MSG_PEEK test for SOCK_SEQPACKET

 tools/testing/vsock/util.h       |   3 +
 tools/testing/vsock/util.c       | 124 ++++++++++++--------
 tools/testing/vsock/vsock_test.c | 187 ++++++-------------------------
 3 files changed, 117 insertions(+), 197 deletions(-)

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2.41.0