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e1a0ee3cf6
On sendto() transient error, prior to this patch sending was simulated and we relied on retransmission to retry sending. This could hurt significantly the performance. Thanks to quic-conn owned socket support, it is now possible to improve this. On transient error, sending is interrupted and quic-conn socket FD is subscribed on the poller for sending. When send is possible, quic_conn_sock_fd_iocb() will be in charge of restart sending. A consequence of this change is on the return value of qc_send_ppkts(). This function will now return 0 on transient error if quic-conn has its owned socket. This is used to interrupt sending in the calling function. The flag QUIC_FL_CONN_TO_KILL must be checked to differentiate a fatal error from a transient one. This should be backported up to 2.7.