c - How to send() buffers atomically, so that they are not dispatched partial?

Question

Currently i'm having the problem, that if I send a buffer, it may be send only partially and return the count of bytes sent. Is there any way to set some option or sth. that prevents the bsd socket from sending partially?

Answer 1

SOCK_STREAM通常，对于TCP 等套接字类型，没有办法做到这一点。SOCK_DATAGRAM（对于 IP，这意味着 UDP）和SOCK_SEQPACKET（对于 IP，没有这样的东西）会做你想做的事，但它们自己有不同的限制。

无论如何，解决方案是您需要自己进行数据缓冲和成帧。也就是说，您需要在发送的流中包含带内信息，以允许接收者重建您想要的“数据包”边界。