strerror(errno)：获取errno对应的错误

查看错误代码errno是调试程序的一个重要方法。当linux 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。

errno. is: Success

errno. is: Operation not permitted

errno. is: No such file or directory

errno. is: No such process

errno. is: Interrupted system call

errno. is: Input/output error

errno. is: No such device or address

errno. is: Argument list too long

errno. is: Exec format error

errno. is: Bad file descriptor

errno. is: No child processes

errno. is: Resource temporarily unavailable[资源临时不可用](连续发送数据时候回出此错，加延时)

errno. is: Cannot allocate memory

errno. is: Permission denied

errno. is: Bad address

errno. is: Block device required

errno. is: Device or resource busy

errno. is: File exists

errno. is: Invalid cross-device link

errno. is: No such device

errno. is: Not a directory

errno. is: Is a directory

errno. is: Invalid argument

errno. is: Too many open files in system

errno. is: Too many open files

errno. is: Inappropriate ioctl for device

errno. is: Text file busy

errno. is: File too large

errno. is: No space left on device

errno. is: Illegal seek

errno. is: Read-only file system

errno. is: Too many links

errno. is: Broken pipe[断开的管道](原因：the broken pipe error occurs if one end of the

TCP socket closes connection(using disconnect) or gets killed and the other

end tries to still write to it. An indication of a closed/terminated

connection is a return value of  when you try to read from that socket

using recv. After receiving such an error, if you try to still write to the

socket, your process gets sent the SIGPIPE signal which kills it.

)

errno. is: Numerical argument out of domain

errno. is: Numerical result out of range

errno. is: Resource deadlock avoided

errno. is: File name too long

errno. is: No locks available

errno. is: Function not implemented

errno. is: Directory not empty

errno. is: Too many levels of symbolic links

errno. is: Unknown error

errno. is: No message of desired type

errno. is: Identifier removed

errno. is: Channel number out of range

errno. is: Level  not synchronized

errno. is: Level  halted

errno. is: Level  reset

errno. is: Link number out of range

errno. is: Protocol driver not attached

errno. is: No CSI structure available

errno. is: Level  halted

errno. is: Invalid exchange

errno. is: Invalid request descriptor

errno. is: Exchange full

errno. is: No anode

errno. is: Invalid request code

errno. is: Invalid slot

errno. is: Unknown error

errno. is: Bad font file format

errno. is: Device not a stream

errno. is: No data available

errno. is: Timer expired

errno. is: Out of streams resources

errno. is: Machine is not on the network

errno. is: Package not installed

errno. is: Object is remote

errno. is: Link has been severed

errno. is: Advertise error

errno. is: Srmount error

errno. is: Communication error on send

errno. is: Protocol error

errno. is: Multihop attempted

errno. is: RFS specific error

errno. is: Bad message

errno. is: Value too large for defined data type

errno. is: Name not unique on network

errno. is: File descriptor in bad state

errno. is: Remote address changed

errno. is: Can not access a needed shared library

errno. is: Accessing a corrupted shared library

errno. is: .lib section in a.out corrupted

errno. is: Attempting to link in too many shared libraries

errno. is: Cannot exec a shared library directly

errno. is: Invalid or incomplete multibyte or wide character

errno. is: Interrupted system call should be restarted

errno. is: Streams pipe error

errno. is: Too many users

errno. is: Socket operation on non-socket

errno. is: Destination address required

errno. is: Message too long

errno. is: Protocol wrong type for socket

errno. is: Protocol not available

errno. is: Protocol not supported

errno. is: Socket type not supported

errno. is: Operation not supported

errno. is: Protocol family not supported

errno. is: Address family not supported by protocol

errno. is: Address already in use

errno. is: Cannot assign requested address

errno. is: Network is down

errno. is: Network is unreachable

errno. is: Network dropped connection on reset

errno. is: Software caused connection abort

errno. is: Connection reset by peer[l连接被对端重置]

errno. is: No buffer space available

errno. is: Transport endpoint is already connected

errno. is: Transport endpoint is not connected

errno. is: Cannot send after transport endpoint shutdown

errno. is: Too many references: cannot splice

errno. is: Connection timed out

errno. is: Connection refused

errno. is: Host is down

errno. is: No route to host

errno. is: Operation already in progress

errno. is: Operation now in progress

errno. is: Stale NFS file handle

errno. is: Structure needs cleaning

errno. is: Not a XENIX named type file

errno. is: No XENIX semaphores available

errno. is: Is a named type file

errno. is: Remote I/O error

errno. is: Disk quota exceeded

errno. is: No medium found

errno. is: Wrong medium type

errno. is: Operation canceled

errno. is: Required key not available

errno. is: Key has expired

errno. is: Key has been revoked

errno. is: Key was rejected by service

errno. is: Owner died

errno. is: State not recoverable

errno. is: Unknown error

- 全是Unknown error