Avoiding Common Networking Mistakes

https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/CommonPitfalls/CommonPitfalls.html#//apple_ref/doc/uid/TP40010220-CH4-SW1

iOS 记得

signal(SIGPIPE, SIG_IGN);

or

int value = 1;
setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, &value, sizeof(value));