linux socket系统调用socket，accept，bind，listen，connect，send，recv等函数出错时，errno的值及其含义对应如下：
EAGAIN: Resource temporarily unavailable EWOULDBLOCK: Resource temporarily unavailable EBADF: Bad file descriptor ECONNREFUSED: Connection refused EFAULT: Bad address EINTR: Interrupted system call EINVAL: Invalid argument ENOMEM: Cannot allocate memory ENOTCONN: Transport endpoint is not connected ENOTSOCK: Socket operation on non-socket EACCES: Permission denied ECONNRESET: Connection reset by peer EDESTADDRREQ: Destination address required EMSGSIZE: Message too long ENOBUFS: No buffer space available EOPNOTSUPP: Operation not supported EPIPE: Broken pipe EPERM: Operation not permitted EADDRINUSE: Address already in use EAFNOSUPPORT: Address family not supported by protocol EALREADY: Operation already in progress EINPROGRESS: Operation now in progress EISCONN: Transport endpoint is already connected ENETUNREACH: Network is unreachable ETIMEDOUT: Connection timed out EMFILE: Too many open files ENFILE: Too many open files in system EPROTO: Protocol error EADDRINUSE: Address already in use EADDRNOTAVAIL: Cannot assign requested address ELOOP: Too many levels of symbolic links ENAMETOOLONG: File name too long ENOENT: No such file or directory ENOTDIR: Not a directory EROFS: Read-only file system EPROTONOSUPPORT: Protocol not supported
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