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1febc2d316
Send is conducted through qc_send_ppkts() for a QUIC connection. There is two types of error which can be encountered on sendto() or affiliated syscalls : * transient error. In this case, sending is simulated with the remaining data and retransmission process is used to have the opportunity to retry emission * fatal error. If this happens, the connection should be closed as soon as possible. This is done via qc_kill_conn() function. Until this patch, only ECONNREFUSED errno was considered as fatal. Modify the QUIC send API to be able to differentiate transient and fatal errors more easily. This is done by fixing the return value of the sendto() wrapper qc_snd_buf() : * on fatal error, a negative error code is returned. This is now the case for every errno except EAGAIN, EWOULDBLOCK, ENOTCONN, EINPROGRESS and EBADF. * on a transient error, 0 is returned. This is the case for the listed errno values above and also if a partial send has been conducted by the kernel. * on success, the return value of sendto() syscall is returned. This commit will be useful to be able to handle transient error with a quic-conn owned socket. In this case, the socket should be subscribed to the poller and no simulated send will be conducted. This commit allows errno management to be confined in the quic-sock module which is a nice cleanup. On a final note, EBADF should be considered as fatal. This will be the subject of a next commit. This should be backported up to 2.7. |
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