C/C++ — Socket通讯错误码解释

	#define	EPERM		 1	/* Operation not permitted */           操作不允许
	#define	ENOENT		 2	/* No such file or directory */         文件或路径不存在
	#define	ESRCH		 3	/* No such process */                   进程不存在
	#define	EINTR		 4	/* Interrupted system call */           中断的系统调用
	#define	EIO		 5	/* I/O error */                         I/O错误
	#define	ENXIO		 6	/* No such device or address */         设备或地址不存在
	#define	E2BIG		 7	/* Argument list too long */            参数列表过长
	#define	ENOEXEC		 8	/* Exec format error */                 执行格式错误
	#define	EBADF		 9	/* Bad file number */                   错误的文件编码
	#define	ECHILD		10	/* No child processes */                子进程不存在
	#define	EAGAIN		11	/* Try again */                         重试，非阻塞socket一般在缓冲区无数据时返回，阻塞socket标识超时
	#define	ENOMEM		12	/* Out of memory */                     内存不足
	#define	EACCES		13	/* Permission denied */                 没有权限
	#define	EFAULT		14	/* Bad address */                       地址错误
	#define	ENOTBLK		15	/* Block device required */             需要块设备
	#define	EBUSY		16	/* Device or resource busy */           设备或资源忙
	#define	EEXIST		17	/* File exists */                       文件已经存在
	#define	EXDEV		18	/* Cross-device link */                 跨设备链路
	#define	ENODEV		19	/* No such device */                    设备不存在
	#define	ENOTDIR		20	/* Not a directory */                   文件夹路径不存在
	#define	EISDIR		21	/* Is a directory */                    是文件夹路径
	#define	EINVAL		22	/* Invalid argument */                  无效参数
	#define	ENFILE		23	/* File table overflow */               文件表溢出
	#define	EMFILE		24	/* Too many open files */               打开的文件描过多
	#define	ENOTTY		25	/* Not a typewriter */                  非打字机
	#define	ETXTBSY		26	/* Text file busy */                    文本文件忙，缓冲区被占用
	#define	EFBIG		27	/* File too large */                    文件过大
	#define	ENOSPC		28	/* No space left on device */           设备没有剩余空间
	#define	ESPIPE		29	/* Illegal seek */                      非法查询
	#define	EROFS		30	/* Read-only file system */             文件系统只读
	#define	EMLINK		31	/* Too many links */                    连接过多，超过系统限制
	#define	EPIPE		32	/* Broken pipe */                       管道破裂
	#define	EDOM		33	/* Math argument out of domain of func */ 参数超出函数域
	#define	ERANGE		34	/* Math result not representable */     结果无法表示
	#define	EDEADLK		35	/* Resource deadlock would occur */     资源将发生死锁
	#define	ENAMETOOLONG	36	/* File name too long */                文件名过长
	#define	ENOLCK		37	/* No record locks available */         没有可用的记录锁
	#define	ENOSYS		38	/* Function not implemented */          函数未实现
	#define	ENOTEMPTY	39	/* Directory not empty */               文件夹非空
	#define	ELOOP		40	/* Too many symbolic links encountered */ 遇到太多的符号连接
	#define	EWOULDBLOCK	EAGAIN	/* Operation would block */             操作将阻塞
	#define	ENOMSG		42	/* No message of desired type */        没有符合需求类型的消息
	#define	EIDRM		43	/* Identifier removed */                标识符已移除
	#define	ECHRNG		44	/* Channel number out of range */       通道编号超出范围
	#define	EL2NSYNC	45	/* Level 2 not synchronized */          Level 2 未同步
	#define	EL3HLT		46	/* Level 3 halted */                    Level 3 停止
	#define	EL3RST		47	/* Level 3 reset */                     Level 3 重置
	#define	ELNRNG		48	/* Link number out of range */          连接数量超出范围
	#define	EUNATCH		49	/* Protocol driver not attached */      协议驱动程序未附加
	#define	ENOCSI		50	/* No CSI structure available */        无CSI结构可用
	#define	EL2HLT		51	/* Level 2 halted */                    Level 2 停止
	#define	EBADE		52	/* Invalid exchange */                  无效的交换
	#define	EBADR		53	/* Invalid request descriptor */        无效的请求描述
	#define	EXFULL		54	/* Exchange full */                     交换完全
	#define	ENOANO		55	/* No anode */                          无阳极
	#define	EBADRQC		56	/* Invalid request code */              无效的请求码
	#define	EBADSLT		57	/* Invalid slot */                      无效的插槽
	#define	EDEADLOCK	EDEADLK
	#define	EBFONT		59	/* Bad font file format */              错误的字体文件格式
	#define	ENOSTR		60	/* Device not a stream */               设备非流
	#define	ENODATA		61	/* No data available */                 无有效数据
	#define	ETIME		62	/* Timer expired */                     计时器到期
	#define	ENOSR		63	/* Out of streams resources */          超出流资源
	#define	ENONET		64	/* Machine is not on the network */     机器不在网络
	#define	ENOPKG		65	/* Package not installed */             未安装包
	#define	EREMOTE		66	/* Object is remote */                  对象是远程
	#define	ENOLINK		67	/* Link has been severed */             链接正在服务中
	#define	EADV		68	/* Advertise error */                   广告错误
	#define	ESRMNT		69	/* Srmount error */    这个错误是RFS特定的。 当远程计算机仍在装载资源时尝试停止RFS，或者当资源使用不包含具有当前装入的资源的远程计算机的客户机列表重新进行读取时发生。
	#define	ECOMM		70	/* Communication error on send */       发送过程中通讯错误
	#define	EPROTO		71	/* Protocol error */                    协议错误
	#define	EMULTIHOP	72	/* Multihop attempted */                多跳尝试
	#define	EDOTDOT		73	/* RFS specific error */                RFS特殊错误
	#define	EBADMSG		74	/* Not a data message */                不是数据类型的消息
	#define	EOVERFLOW	75	/* Value too large for defined data type */ 对指定的数据类型来说值太大
	#define	ENOTUNIQ	76	/* Name not unique on network */        网络上名字不唯一
	#define	EBADFD		77	/* File descriptor in bad state */      文件描述符状态错误
	#define	EREMCHG		78	/* Remote address changed */            远程地址改变
	#define	ELIBACC		79	/* Can not access a needed shared library */  无法访问需要的共享库
	#define	ELIBBAD		80	/* Accessing a corrupted shared library */    访问损坏的共享库
	#define	ELIBSCN		81	/* .lib section in a.out corrupted */         库部分a.out损坏
	#define	ELIBMAX		82	/* Attempting to link in too many shared libraries */   试图连接过多的共享库
	#define	ELIBEXEC	83	/* Cannot exec a shared library directly */    不能直接运行共享库
	#define	EILSEQ		84	/* Illegal byte sequence */            非法字节序
	#define	ERESTART	85	/* Interrupted system call should be restarted */  硬重新启动被中断的的系统调用
	#define	ESTRPIPE	86	/* Streams pipe error */                流管错误
	#define	EUSERS		87	/* Too many users */                    用户过多
	#define	ENOTSOCK	88	/* Socket operation on non-socket */    在非套接字上进行套接字操作
	#define	EDESTADDRREQ	89	/* Destination address required */      需要目标地址
	#define	EMSGSIZE	90	/* Message too long */                  消息过长
	#define	EPROTOTYPE	91	/* Protocol wrong type for socket */    错误的协议类型
	#define	ENOPROTOOPT	92	/* Protocol not available */            无效协议
	#define	EPROTONOSUPPORT	93	/* Protocol not supported */            协议不支持
	#define	ESOCKTNOSUPPORT	94	/* Socket type not supported */         socket类型不支持
	#define	EOPNOTSUPP	95	/* Operation not supported on transport endpoint */ 操作不支持传输端点
	#define	EPFNOSUPPORT	96	/* Protocol family not supported */     不支持的协议族
	#define	EAFNOSUPPORT	97	/* Address family not supported by protocol */ 协议不支持地址群
	#define	EADDRINUSE	98	/* Address already in use */            地址被占用
	#define	EADDRNOTAVAIL	99	/* Cannot assign requested address */   无法分配请求的地址
	#define	ENETDOWN	100	/* Network is down */                   网络关闭
	#define	ENETUNREACH	101	/* Network is unreachable */            网络不可达
	#define	ENETRESET	102	/* Network dropped connection because of reset */  网络复位点开链接
	#define	ECONNABORTED	103	/* Software caused connection abort */  软件导致的连接终止
	#define	ECONNRESET	104	/* Connection reset by peer */          连接被对端复位
	#define	ENOBUFS		105	/* No buffer space available */         没有可用的缓冲空间
	#define	EISCONN		106	/* Transport endpoint is already connected */ 传输端点已连接
	#define	ENOTCONN	107	/* Transport endpoint is not connected */ 传输端点未连接
	#define	ESHUTDOWN	108	/* Cannot send after transport endpoint shutdown */ 传输端点关闭后不允许再发送
	#define	ETOOMANYREFS	109	/* Too many references: cannot splice */    引用过多：无法接合
	#define	ETIMEDOUT	110	/* Connection timed out */              连接超时
	#define	ECONNREFUSED	111	/* Connection refused */                连接被拒绝
	#define	EHOSTDOWN	112	/* Host is down */                      host关闭
	#define	EHOSTUNREACH	113	/* No route to host */                  无法路由到主机
	#define	EALREADY	114	/* Operation already in progress */     操作已在进程中
	#define	EINPROGRESS	115	/* Operation now in progress */         操作正在进行
	#define	ESTALE		116	/* Stale NFS file handle */             
	#define	EUCLEAN		117	/* Structure needs cleaning */
	#define	ENOTNAM		118	/* Not a XENIX named type file */
	#define	ENAVAIL		119	/* No XENIX semaphores available */
	#define	EISNAM		120	/* Is a named type file */
	#define	EREMOTEIO	121	/* Remote I/O error */                  远程I/O错误
	#define	EDQUOT		122	/* Quota exceeded */
	#define	ENOMEDIUM	123	/* No medium found */
	#define	EMEDIUMTYPE	124	/* Wrong medium type */
	#define	ECANCELED	125	/* Operation Canceled */
	#define	ENOKEY		126	/* Required key not available */
	#define	EKEYEXPIRED	127	/* Key has expired */
	#define	EKEYREVOKED	128	/* Key has been revoked */
	#define	EKEYREJECTED	129	/* Key was rejected by service */
	 ```