在MySQL数据库的维护过程中，我们有时候会在MySQL的错误日志文件中看到一些关于Operating system error的错误信息，例如在MySQL的错误日志里面，有时候会看到关于

InnoDB: Operating system error number 0.

InnoDB: Check that your OS and file system support files of this size.

InnoDB: Check also that the disk is not full or a disk quota exceeded.

InnoDB: Operating system error number 5.

...........................................

那么这些System Error Code在Linux下分别代表什么意思呢？其实如果遇到错误日志里有这些对应的代码，使用MySQL自带的命令工具perror查看一下具体信息即可。非常简单方便。

[root@DB-Server ~]# perror 2;

OS error code2:No such file or directory

[root@DB-Server ~]# perror 3;

OS error code3:No such process

[root@DB-Server ~]# perror 4;

OS error code4:Interrupted system call

[root@DB-Server ~]# perror 5;

OS error code5:Input/output error

[root@DB-Server ~]#

如果你要查看一个范围的Operating system error，可以使用下面命令

[root@DB-Server ~]# perror `seq 0 10`

OS error code0:Success

OS error code1:Operation not permitted

OS error code2:No such file or directory

OS error code3:No such process

OS error code4:Interrupted system call

OS error code5:Input/output error

OS error code6:No such device or address

OS error code7:Argument list too long

OS error code8:Exec format error

OS error code9:Bad file descriptor

OS error code10:No child processes

[root@DB-Server ~]#

如果是集群，那么可以shell> perror --ndb errorcode查看， 下面表格是关于Linux平台下通用的System Error Code列表，如下所示，完全没有必要硬性记住。遇到查看即可。

Number Macro Description

1 EPERM Operation not permitted

2 ENOENT No such file or directory

3 ESRCH No such process

4 EINTR Interrupted system call

5 EIO I/O error

6 ENXIO No such device or address

7 E2BIG Arg list too long

8 ENOEXEC Exec format error

9 EBADF Bad file number

10 ECHILD No child processes

11 EAGAIN Try again

12 ENOMEM Out of memory

13 EACCES Permission denied

14 EFAULT Bad address

15 ENOTBLK Block device required

16 EBUSY Device or resource busy

17 EEXIST File exists

18 EXDEV Cross-device link

19 ENODEV No such device

20 ENOTDIR Not a directory

21 EISDIR Is a directory

22 EINVAL Invalid argument

23 ENFILE File table overflow

24 EMFILE Too many open files

25 ENOTTY Inappropriate ioctl for device

26 ETXTBSY Text file busy

27 EFBIG File too large

28 ENOSPC No space left on device

29 ESPIPE Illegal seek

30 EROFS Read-only file system

31 EMLINK Too many links

如果是Windows平台，那么也可以使用下面命令查看具体的System Error Code信息，另外，Windows平台下的System Error Code也远比Linux平台下要多，遇到了这些System Error Code，使用命令查看即可。

perror.exe 2

perror `perl -e "print join ' ',1..100"`

参考资料：

http://doc.docs.sk/mysql-refman-5.5/operating-system-error-codes.html