Hello, this small patchset adds POSIX compliant behaviour on writes to the socket which was shutdowned with 'shutdown()' (both sides - local with SHUT_WR flag, peer - with SHUT_RD flag). According POSIX we must send SIGPIPE in such cases (but SIGPIPE is not send when MSG_NOSIGNAL is set). First patch is implemented in the same way as net/ipv4/tcp.c:tcp_sendmsg_locked(). It uses 'sk_stream_error()' function which handles EPIPE error. Another way is to use code from net/unix/af_unix.c:unix_stream_sendmsg() where same logic from 'sk_stream_error()' is implemented "from scratch", but it doesn't check 'sk_err' field. I think error from this field has more priority to be returned from syscall. So I guess it is better to reuse currently implemented 'sk_stream_error()' function. Test is also added. Head for this patchset is: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=b38460bc463c54e0c15ff3b37e81f7e2059bb9bb Link to v1: https://lore.kernel.org/netdev/20230801141727.481156-1-AVKrasnov@xxxxxxxxxxxxxx/ Changelog: v1 -> v2: * 0001 stills the same - SIGPIPE is sent only for SOCK_STREAM as discussed in v1 with Stefano Garzarella <sgarzare@xxxxxxxxxx>. * 0002 - use 'sig_atomic_t' instead of 'bool' for flag variables updated from signal handler. Arseniy Krasnov (2): vsock: send SIGPIPE on write to shutdowned socket test/vsock: shutdowned socket test net/vmw_vsock/af_vsock.c | 3 + tools/testing/vsock/vsock_test.c | 138 +++++++++++++++++++++++++++++++ 2 files changed, 141 insertions(+) -- 2.25.1
