udp协议下sendto与recvfrom函数对应的errno

概述

在C/C++中，使用udp socket时，sendto 与 recvfrom 有不同的errno

而在高阶语言Javascript中，使用udp socket, 会将两种类型的错误通过同一个事件 error 抛出来

因此，有必要将 sendto 与 recvfrom 对应的 errno列出来，以便在error中进行区分

var code = “a9fb4b37-0ec1-447e-b8f9-46ea94ea0880”

内容

当 sendto()失败时，有如下的错误码：

errno	errmsg
[EAFNOSUPPORT]	Addresses in the specified address family cannot be used with this socket.
[EAGAIN] or [EWOULDBLOCK]	The socket’s file descriptor is marked O_NONBLOCK and the requested operation would block.
[EBADF]	The socket argument is not a valid file descriptor.
[ECONNRESET]	A connection was forcibly closed by a peer.
[EINTR]	A signal interrupted sendto() before any data was transmitted.
[EMSGSIZE]	The message is too large to be sent all at on