查看错误代码errno是调试程序的一个重要方法。当linuc C api函数发生异常时,一般会将errno变量(需include errno.h)赋一个整数值,不同的值表示不同的含义,可以通过查看该值推测出错的原因。在实际编程中用这一招解决了不少原本看来莫名其妙的问题。比较麻烦的是每次都要去linux源代码里面查找错误代码的含义，现在把它贴出来，以后需要查时就来这里看了。
以下来自linux 2.4.20-18的内核代码中的/usr/include/asm/errno.h
#ifndef _I386_ERRNO_H
#define _I386_ERRNO_H
#define EPERM 1 /* Operation not permitted */操作不允许
#define ENOENT 2 /* No such file or directory */文件或目录不存在
#define ESRCH 3 /* No such process */进程不存在
#define EINTR 4 /* Interrupted system call */中断系统调用
#define EIO 5 /* I/O error */ 输入/输出错误
#define ENXIO 6 /* No such device or address */设备(地址)不存在
#define E2BIG 7 /* Arg list too long */参数过长
#define ENOEXEC 8 /* Exec format error */格式化出错
#define EBADF 9 /* Bad file number */错误文件号？？？
#define ECHILD 10 /* No child processes */没有子进程
#define EAGAIN 11 /* Try again */重试
#define ENOMEM 12 /* Out of memory */内存溢出
#define EACCES 13 /* Permission denied */没有权限
#define EFAULT 14 /* Bad address */地址错误？？？
#define ENOTBLK 15 /* Block device required */缺少块设备
#define EBUSY 16 /* Device or resource busy */设备(或资源)忙
#define EEXIST 17 /* File exists */文件已存在
#define EXDEV 18 /* Cross-device link */交叉设备链接？？？
#define ENODEV 19 /* No such device */设备不存在
#define ENOTDIR 20 /* Not a directory */目录不存在
#define EISDIR 21 /* Is a directory */是目录
#define EINVAL 22 /* Invalid argument */参数无效
#define ENFILE 23 /* File table overflow */文件列表溢出？？？
#define EMFILE 24 /* Too many open files */太多打开的文件
#define ENOTTY 25 /* Not a typewriter */非写类型
#define ETXTBSY 26 /* Text file busy */文件忙
#define EFBIG 27 /* File too large */文件太大
#define ENOSPC 28 /* No space left on device */设备空间不足
#define ESPIPE 29 /* Illegal seek */非法搜索
#define EROFS 30 /* Read-only file system */只读文件系统
#define EMLINK 31 /* Too many links */太多链接
#define EPIPE 32 /* Broken pipe */坏管道(不可用的管道)？？？
#define EDOM 33 /* Math argument out of domain of func */
#define ERANGE 34 /* Math result not representable */运算结果不能被表示？？？
#define EDEADLK 35 /* Resource deadlock would occur */资源死锁
#define ENAMETOOLONG 36 /* File name too long */文件名过长
#define ENOLCK 37 /* No record locks available */没有记录锁可用？？？
#define ENOSYS 38 /* Function not implemented */功能不完整
#define ENOTEMPTY 39 /* Directory not empty */目录不为空
#define ELOOP 40 /* Too many symbolic links encountered */计算了太多软连接？？？
#define EWOULDBLOCK EAGAIN /* Operation would block */操作将被阻塞
#define ENOMSG 42 /* No message of desired type */
#define EIDRM 43 /* Identifier removed */标识已被删除？？？
#define ECHRNG 44 /* Channel number out of range */通道号超过范围？？？
#define EL2NSYNC 45 /* Level 2 not synchronized */level2不同步？？？
#define EL3HLT 46 /* Level 3 halted */ level3停止？？？
#define EL3RST 47 /* Level 3 reset */重置level3？？？
#define ELNRNG 48 /* Link number out of range */超过链接数
#define EUNATCH 49 /* Protocol driver not attached */协议驱动无法连接？？？
#define ENOCSI 50 /* No CSI structure available */CSI结构不可用？？？
#define EL2HLT 51 /* Level 2 halted */
#define EBADE 52 /* Invalid exchange */无效交换
#define EBADR 53 /* Invalid request descriptor */无效请求符号
#define EXFULL 54 /* Exchange full */交换满
#define ENOANO 55 /* No anode */
#define EBADRQC 56 /* Invalid request code */无效请求码
#define EBADSLT 57 /* Invalid slot */无效槽？？？
#define EDEADLOCK EDEADLK
#define EBFONT 59 /* Bad font file format */无效文件格式字体？？？
#define ENOSTR 60 /* Device not a stream */非流设备
#define ENODATA 61 /* No data available */无数据可用
#define ETIME 62 /* Timer expired */计时器失效
#define ENOSR 63 /* Out of streams resources */资源流溢出？？？
#define ENONET 64 /* Machine is not on the network */机器不在网络上？？
#define ENOPKG 65 /* Package not installed */包没安装
#define EREMOTE 66 /* Object is remote */对象是远程的
#define ENOLINK 67 /* Link has been severed */服务正在等待连接？？？
#define EADV 68 /* Advertise error */公告错误
#define ESRMNT 69 /* Srmount error */
#define ECOMM 70 /* Communication error on send */发送出错
#define EPROTO 71 /* Protocol error */协议错误
#define EMULTIHOP 72 /* Multihop attempted */
#define EDOTDOT 73 /* RFS specific error */
#define EBADMSG 74 /* Not a data message */没有数据信息
#define EOVERFLOW 75 /* Value too large for defined data type */数据超过了类型的最大限制
#define ENOTUNIQ 76 /* Name not unique on network */名字和网络上的冲突
#define EBADFD 77 /* File descriptor in bad state */文件描述器
#define EREMCHG 78 /* Remote address changed */远程地址发生变化
#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 */正在访问损坏的共享库
#define ELIBSCN 81 /* .lib section in a.out corrupted */
#define ELIBMAX 82 /* Attempting to link in too many shared libraries */
#define ELIBEXEC 83 /* Cannot exec a shared library directly */无法直接执行共享库？？？
#define EILSEQ 84 /* Illegal byte sequence */非法字节流？
#define ERESTART 85 /* Interrupted system call should be restarted */中断调用需要重启
#define ESTRPIPE 86 /* Streams pipe error */流管道错误？
#define EUSERS 87 /* Too many users */用户过多
#define ENOTSOCK 88 /* Socket operation on non-socket */？？？
#define EDESTADDRREQ 89 /* Destination address required */缺少目的地址
#define EMSGSIZE 90 /* Message too long */消息过长
#define EPROTOTYPE 91 /* Protocol wrong type for socket */socket的协议类型错误？？
#define ENOPROTOOPT 92 /* Protocol not available */协议不可用
#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 */交换端不支持此操作？？？
#define EPFNOSUPPORT 96 /* Protocol family not supported */协议族不支持
#define EAFNOSUPPORT 97 /* Address family not supported by protocol */协议不支持该地址族
#define EADDRINUSE 98 /* Address already in use */地址已被使用
#define EADDRNOTAVAIL 99 /* Cannot assign requested address */无法签约需要的地址？
#define ENETDOWN 100 /* Network is down */网络不可用？
#define ENETUNREACH 101 /* Network is unreachable */网络不可达
#define ENETRESET 102 /* Network dropped connection because of reset */网络因为重置而断开
#define ECONNABORTED 103 /* Software caused connection abort */软件引发连接终止
#define ECONNRESET 104 /* Connection reset by peer */连接被peer重置？？？
#define ENOBUFS 105 /* No buffer space available */没有缓冲区可用
#define EISCONN 106 /* Transport endpoint is already connected */交换终端已连接？
#define ENOTCONN 107 /* Transport endpoint is not connected */交换终端没有连接？
#define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */无法发送 交换终端已关闭
#define ETOOMANYREFS 109 /* Too many references: cannot splice */太多参数：无法拼接
#define ETIMEDOUT 110 /* Connection timed out */连接超时
#define ECONNREFUSED 111 /* Connection refused */连接被拒
#define EHOSTDOWN 112 /* Host is down */主机不可用
#define EHOSTUNREACH 113 /* No route to host */没有可达路由？
#define EALREADY 114 /* Operation already in progress */操作已在进程
#define EINPROGRESS 115 /* Operation now in progress */操作已加入进程
#define ESTALE 116 /* Stale NFS file handle */
#define EUCLEAN 117 /* Structure needs cleaning */结构需要清理
#define ENOTNAM 118 /* Not a XENIX named type file */
#define ENAVAIL 119 /* No XENIX semaphores available */
#define EISNAM 120 /* Is a named type file */命名类型文件
#define EREMOTEIO 121 /* Remote I/O error */远程 I/O 错误
#define EDQUOT 122 /* Quota exceeded */超出限额
#define ENOMEDIUM 123 /* No medium found */没发现媒介
#define EMEDIUMTYPE 124 /* Wrong medium type */媒介类型错误
#endif
以下来自linux 2.4.20-18的内核代码中的/usr/include/asm/errno.h
#ifndef _I386_ERRNO_H
#define _I386_ERRNO_H
#define EPERM 1 /* Operation not permitted */操作不允许
#define ENOENT 2 /* No such file or directory */文件或目录不存在
#define ESRCH 3 /* No such process */进程不存在
#define EINTR 4 /* Interrupted system call */中断系统调用
#define EIO 5 /* I/O error */ 输入/输出错误
#define ENXIO 6 /* No such device or address */设备(地址)不存在
#define E2BIG 7 /* Arg list too long */参数过长
#define ENOEXEC 8 /* Exec format error */格式化出错
#define EBADF 9 /* Bad file number */错误文件号？？？
#define ECHILD 10 /* No child processes */没有子进程
#define EAGAIN 11 /* Try again */重试
#define ENOMEM 12 /* Out of memory */内存溢出
#define EACCES 13 /* Permission denied */没有权限
#define EFAULT 14 /* Bad address */地址错误？？？
#define ENOTBLK 15 /* Block device required */缺少块设备
#define EBUSY 16 /* Device or resource busy */设备(或资源)忙
#define EEXIST 17 /* File exists */文件已存在
#define EXDEV 18 /* Cross-device link */交叉设备链接？？？
#define ENODEV 19 /* No such device */设备不存在
#define ENOTDIR 20 /* Not a directory */目录不存在
#define EISDIR 21 /* Is a directory */是目录
#define EINVAL 22 /* Invalid argument */参数无效
#define ENFILE 23 /* File table overflow */文件列表溢出？？？
#define EMFILE 24 /* Too many open files */太多打开的文件
#define ENOTTY 25 /* Not a typewriter */非写类型
#define ETXTBSY 26 /* Text file busy */文件忙
#define EFBIG 27 /* File too large */文件太大
#define ENOSPC 28 /* No space left on device */设备空间不足
#define ESPIPE 29 /* Illegal seek */非法搜索
#define EROFS 30 /* Read-only file system */只读文件系统
#define EMLINK 31 /* Too many links */太多链接
#define EPIPE 32 /* Broken pipe */坏管道(不可用的管道)？？？
#define EDOM 33 /* Math argument out of domain of func */
#define ERANGE 34 /* Math result not representable */运算结果不能被表示？？？
#define EDEADLK 35 /* Resource deadlock would occur */资源死锁
#define ENAMETOOLONG 36 /* File name too long */文件名过长
#define ENOLCK 37 /* No record locks available */没有记录锁可用？？？
#define ENOSYS 38 /* Function not implemented */功能不完整
#define ENOTEMPTY 39 /* Directory not empty */目录不为空
#define ELOOP 40 /* Too many symbolic links encountered */计算了太多软连接？？？
#define EWOULDBLOCK EAGAIN /* Operation would block */操作将被阻塞
#define ENOMSG 42 /* No message of desired type */
#define EIDRM 43 /* Identifier removed */标识已被删除？？？
#define ECHRNG 44 /* Channel number out of range */通道号超过范围？？？
#define EL2NSYNC 45 /* Level 2 not synchronized */level2不同步？？？
#define EL3HLT 46 /* Level 3 halted */ level3停止？？？
#define EL3RST 47 /* Level 3 reset */重置level3？？？
#define ELNRNG 48 /* Link number out of range */超过链接数
#define EUNATCH 49 /* Protocol driver not attached */协议驱动无法连接？？？
#define ENOCSI 50 /* No CSI structure available */CSI结构不可用？？？
#define EL2HLT 51 /* Level 2 halted */
#define EBADE 52 /* Invalid exchange */无效交换
#define EBADR 53 /* Invalid request descriptor */无效请求符号
#define EXFULL 54 /* Exchange full */交换满
#define ENOANO 55 /* No anode */
#define EBADRQC 56 /* Invalid request code */无效请求码
#define EBADSLT 57 /* Invalid slot */无效槽？？？
#define EDEADLOCK EDEADLK
#define EBFONT 59 /* Bad font file format */无效文件格式字体？？？
#define ENOSTR 60 /* Device not a stream */非流设备
#define ENODATA 61 /* No data available */无数据可用
#define ETIME 62 /* Timer expired */计时器失效
#define ENOSR 63 /* Out of streams resources */资源流溢出？？？
#define ENONET 64 /* Machine is not on the network */机器不在网络上？？
#define ENOPKG 65 /* Package not installed */包没安装
#define EREMOTE 66 /* Object is remote */对象是远程的
#define ENOLINK 67 /* Link has been severed */服务正在等待连接？？？
#define EADV 68 /* Advertise error */公告错误
#define ESRMNT 69 /* Srmount error */
#define ECOMM 70 /* Communication error on send */发送出错
#define EPROTO 71 /* Protocol error */协议错误
#define EMULTIHOP 72 /* Multihop attempted */
#define EDOTDOT 73 /* RFS specific error */
#define EBADMSG 74 /* Not a data message */没有数据信息
#define EOVERFLOW 75 /* Value too large for defined data type */数据超过了类型的最大限制
#define ENOTUNIQ 76 /* Name not unique on network */名字和网络上的冲突
#define EBADFD 77 /* File descriptor in bad state */文件描述器
#define EREMCHG 78 /* Remote address changed */远程地址发生变化
#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 */正在访问损坏的共享库
#define ELIBSCN 81 /* .lib section in a.out corrupted */
#define ELIBMAX 82 /* Attempting to link in too many shared libraries */
#define ELIBEXEC 83 /* Cannot exec a shared library directly */无法直接执行共享库？？？
#define EILSEQ 84 /* Illegal byte sequence */非法字节流？
#define ERESTART 85 /* Interrupted system call should be restarted */中断调用需要重启
#define ESTRPIPE 86 /* Streams pipe error */流管道错误？
#define EUSERS 87 /* Too many users */用户过多
#define ENOTSOCK 88 /* Socket operation on non-socket */？？？
#define EDESTADDRREQ 89 /* Destination address required */缺少目的地址
#define EMSGSIZE 90 /* Message too long */消息过长
#define EPROTOTYPE 91 /* Protocol wrong type for socket */socket的协议类型错误？？
#define ENOPROTOOPT 92 /* Protocol not available */协议不可用
#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 */交换端不支持此操作？？？
#define EPFNOSUPPORT 96 /* Protocol family not supported */协议族不支持
#define EAFNOSUPPORT 97 /* Address family not supported by protocol */协议不支持该地址族
#define EADDRINUSE 98 /* Address already in use */地址已被使用
#define EADDRNOTAVAIL 99 /* Cannot assign requested address */无法签约需要的地址？
#define ENETDOWN 100 /* Network is down */网络不可用？
#define ENETUNREACH 101 /* Network is unreachable */网络不可达
#define ENETRESET 102 /* Network dropped connection because of reset */网络因为重置而断开
#define ECONNABORTED 103 /* Software caused connection abort */软件引发连接终止
#define ECONNRESET 104 /* Connection reset by peer */连接被peer重置？？？
#define ENOBUFS 105 /* No buffer space available */没有缓冲区可用
#define EISCONN 106 /* Transport endpoint is already connected */交换终端已连接？
#define ENOTCONN 107 /* Transport endpoint is not connected */交换终端没有连接？
#define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */无法发送 交换终端已关闭
#define ETOOMANYREFS 109 /* Too many references: cannot splice */太多参数：无法拼接
#define ETIMEDOUT 110 /* Connection timed out */连接超时
#define ECONNREFUSED 111 /* Connection refused */连接被拒
#define EHOSTDOWN 112 /* Host is down */主机不可用
#define EHOSTUNREACH 113 /* No route to host */没有可达路由？
#define EALREADY 114 /* Operation already in progress */操作已在进程
#define EINPROGRESS 115 /* Operation now in progress */操作已加入进程
#define ESTALE 116 /* Stale NFS file handle */
#define EUCLEAN 117 /* Structure needs cleaning */结构需要清理
#define ENOTNAM 118 /* Not a XENIX named type file */
#define ENAVAIL 119 /* No XENIX semaphores available */
#define EISNAM 120 /* Is a named type file */命名类型文件
#define EREMOTEIO 121 /* Remote I/O error */远程 I/O 错误
#define EDQUOT 122 /* Quota exceeded */超出限额
#define ENOMEDIUM 123 /* No medium found */没发现媒介
#define EMEDIUMTYPE 124 /* Wrong medium type */媒介类型错误
#endif
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