错误号
来自cppreference.com
定义于 <cerrno> 的每个宏均展开成 int 类型的整数常量表达式，每个都拥有正值，匹配 POSIX 错误码中的大多数。下列常量得到定义（实现可以定义更多，只要它们以 'E' 开始，后随数字或大写字母）
在标头
<cerrno> 定义 | |
E2BIG (C++11) |
参数列表过长 (宏常量) |
EACCES (C++11) |
权限被禁止 (宏常量) |
EADDRINUSE (C++11) |
地址在使用中 (宏常量) |
EADDRNOTAVAIL (C++11) |
地址不可用 (宏常量) |
EAFNOSUPPORT (C++11) |
不支持地址系列 (宏常量) |
EAGAIN (C++11) |
资源不可用，须重试 (宏常量) |
EALREADY (C++11) |
连接已在进行 (宏常量) |
EBADF (C++11) |
坏的的文件描述符 (宏常量) |
EBADMSG (C++11) |
坏的消息 (宏常量) |
EBUSY (C++11) |
设备或资源忙 (宏常量) |
ECANCELED (C++11) |
操作取消 (宏常量) |
ECHILD (C++11) |
无子进程 (宏常量) |
ECONNABORTED (C++11) |
连接被打断 (宏常量) |
ECONNREFUSED (C++11) |
连接被拒绝 (宏常量) |
ECONNRESET (C++11) |
连接被重置 (宏常量) |
EDEADLK (C++11) |
资源死锁会发生 (宏常量) |
EDESTADDRREQ (C++11) |
要求目标地址 (宏常量) |
EDOM |
数学参数在函数定义域外 (宏常量) |
EEXIST (C++11) |
文件已存在 (宏常量) |
EFAULT (C++11) |
坏的地址 (宏常量) |
EFBIG (C++11) |
文件过大 (宏常量) |
EHOSTUNREACH (C++11) |
主机不可抵达 (宏常量) |
EIDRM (C++11) |
标识符被移除 (宏常量) |
EILSEQ (C++11) |
非法字节序列 (宏常量) |
EINPROGRESS (C++11) |
操作已在进行 (宏常量) |
EINTR (C++11) |
函数被中断 (宏常量) |
EINVAL (C++11) |
非法参数 (宏常量) |
EIO (C++11) |
I/O 错误 (宏常量) |
EISCONN (C++11) |
接头已连接 (宏常量) |
EISDIR (C++11) |
是目录 (宏常量) |
ELOOP (C++11) |
符号链接级别过多 (宏常量) |
EMFILE (C++11) |
文件描述符值过大 (宏常量) |
EMLINK (C++11) |
链接过多 (宏常量) |
EMSGSIZE (C++11) |
消息过大 (宏常量) |
ENAMETOOLONG (C++11) |
文件名过长 (宏常量) |
ENETDOWN (C++11) |
网络不工作 (宏常量) |
ENETRESET (C++11) |
连接被网络打断 (宏常量) |
ENETUNREACH (C++11) |
网络不可抵达 (宏常量) |
ENFILE (C++11) |
系统中打开文件过多 (宏常量) |
ENOBUFS (C++11) |
无缓冲空间可用 (宏常量) |
ENODATA (C++11) |
流头已读取队列中无消息 (宏常量) |
ENODEV (C++11) |
无此设备 (宏常量) |
ENOENT (C++11) |
无此文件或目录 (宏常量) |
ENOEXEC (C++11) |
可执行文件格式错误 (宏常量) |
ENOLCK (C++11) |
无可用锁 (宏常量) |
ENOLINK (C++11) |
链接已切断 (宏常量) |
ENOMEM (C++11) |
空间不足 (宏常量) |
ENOMSG (C++11) |
无所需类型消息 (宏常量) |
ENOPROTOOPT (C++11) |
协议不可用 (宏常量) |
ENOSPC (C++11) |
设备无剩余空间 (宏常量) |
ENOSR (C++11) |
无流资源 (宏常量) |
ENOSTR (C++11) |
非流 (宏常量) |
ENOSYS (C++11) |
不支持的函数 (宏常量) |
ENOTCONN (C++11) |
未连接的接头 (宏常量) |
ENOTDIR (C++11) |
非目录 (宏常量) |
ENOTEMPTY (C++11) |
目录非空 (宏常量) |
ENOTRECOVERABLE (C++11) |
状态不可恢复 (宏常量) |
ENOTSOCK (C++11) |
非接头 (宏常量) |
ENOTSUP (C++11) |
不支持 (宏常量) |
ENOTTY (C++11) |
不适合的 I/O 控制操作 (宏常量) |
ENXIO (C++11) |
无此设备或地址 (宏常量) |
EOPNOTSUPP (C++11) |
接头上不支持的操作 (宏常量) |
EOVERFLOW (C++11) |
值过大而无法存入数据类型 (宏常量) |
EOWNERDEAD (C++11) |
先前拥有者已死 (宏常量) |
EPERM (C++11) |
操作不允许 (宏常量) |
EPIPE (C++11) |
管道损坏 (宏常量) |
EPROTO (C++11) |
协议错误 (宏常量) |
EPROTONOSUPPORT (C++11) |
不支持的协议 (宏常量) |
EPROTOTYPE (C++11) |
接头类型错误的协议 (宏常量) |
ERANGE |
结果过大 (宏常量) |
EROFS (C++11) |
只读文件系统 (宏常量) |
ESPIPE (C++11) |
非法寻位 (宏常量) |
ESRCH (C++11) |
无此进程 (宏常量) |
ETIME (C++11) |
流 ioctl() 超时 (宏常量) |
ETIMEDOUT (C++11) |
连接超时 (宏常量) |
ETXTBSY (C++11) |
文本文件忙 (宏常量) |
EWOULDBLOCK (C++11) |
操作会阻塞 (宏常量) |
EXDEV (C++11) |
跨设备链接 (宏常量) |
要求所有值均为唯一值，但 EOPNOTSUPP 与 ENOTSUP 的值可以相同，且 EAGAIN 与 EWOULDBLOCK 的值可以相同。
示例
运行此代码
#include <cerrno>
#include <cstring>
#include <iomanip>
#include <iostream>
#define SHOW(x) std::cout << std::setw(15) << #x << ": " << std::strerror(x) << '\n'
int main()
{
std::cout << "Known error codes/messages:\n\n";
SHOW( E2BIG );
SHOW( EACCES );
SHOW( EADDRINUSE );
SHOW( EADDRNOTAVAIL );
SHOW( EAFNOSUPPORT );
SHOW( EAGAIN );
SHOW( EALREADY );
SHOW( EBADF );
SHOW( EBADMSG );
SHOW( EBUSY );
SHOW( ECANCELED );
SHOW( ECHILD );
SHOW( ECONNABORTED );
SHOW( ECONNREFUSED );
SHOW( ECONNRESET );
SHOW( EDEADLK );
SHOW( EDESTADDRREQ );
SHOW( EDOM );
SHOW( EEXIST );
SHOW( EFAULT );
SHOW( EFBIG );
SHOW( EHOSTUNREACH );
SHOW( EIDRM );
SHOW( EILSEQ );
SHOW( EINPROGRESS );
SHOW( EINTR );
SHOW( EINVAL );
SHOW( EIO );
SHOW( EISCONN );
SHOW( EISDIR );
SHOW( ELOOP );
SHOW( EMFILE );
SHOW( EMLINK );
SHOW( EMSGSIZE );
SHOW( ENAMETOOLONG );
SHOW( ENETDOWN );
SHOW( ENETRESET );
SHOW( ENETUNREACH );
SHOW( ENFILE );
SHOW( ENOBUFS );
SHOW( ENODATA );
SHOW( ENODEV );
SHOW( ENOENT );
SHOW( ENOEXEC );
SHOW( ENOLCK );
SHOW( ENOLINK );
SHOW( ENOMEM );
SHOW( ENOMSG );
SHOW( ENOPROTOOPT );
SHOW( ENOSPC );
SHOW( ENOSR );
SHOW( ENOSTR );
SHOW( ENOSYS );
SHOW( ENOTCONN );
SHOW( ENOTDIR );
SHOW( ENOTEMPTY );
SHOW( ENOTRECOVERABLE );
SHOW( ENOTSOCK );
SHOW( ENOTSUP );
SHOW( ENOTTY );
SHOW( ENXIO );
SHOW( EOPNOTSUPP );
SHOW( EOVERFLOW );
SHOW( EOWNERDEAD );
SHOW( EPERM );
SHOW( EPIPE );
SHOW( EPROTO );
SHOW( EPROTONOSUPPORT );
SHOW( EPROTOTYPE );
SHOW( ERANGE );
SHOW( EROFS );
SHOW( ESPIPE );
SHOW( ESRCH );
SHOW( ETIME );
SHOW( ETIMEDOUT );
SHOW( ETXTBSY );
SHOW( EWOULDBLOCK );
SHOW( EXDEV );
}
可能的输出：
Known error codes/messages:
E2BIG: Argument list too long
EACCES: Permission denied
EADDRINUSE: Address already in use
EADDRNOTAVAIL: Cannot assign requested address
EAFNOSUPPORT: Address family not supported by protocol
EAGAIN: Resource temporarily unavailable
EALREADY: Operation already in progress
EBADF: Bad file descriptor
EBADMSG: Bad message
EBUSY: Device or resource busy
ECANCELED: Operation canceled
ECHILD: No child processes
ECONNABORTED: Software caused connection abort
ECONNREFUSED: Connection refused
ECONNRESET: Connection reset by peer
EDEADLK: Resource deadlock avoided
EDESTADDRREQ: Destination address required
EDOM: Numerical argument out of domain
EEXIST: File exists
EFAULT: Bad address
EFBIG: File too large
EHOSTUNREACH: No route to host
EIDRM: Identifier removed
EILSEQ: Invalid or incomplete multibyte or wide character
EINPROGRESS: Operation now in progress
EINTR: Interrupted system call
EINVAL: Invalid argument
EIO: Input/output error
EISCONN: Transport endpoint is already connected
EISDIR: Is a directory
ELOOP: Too many levels of symbolic links
EMFILE: Too many open files
EMLINK: Too many links
EMSGSIZE: Message too long
ENAMETOOLONG: File name too long
ENETDOWN: Network is down
ENETRESET: Network dropped connection on reset
ENETUNREACH: Network is unreachable
ENFILE: Too many open files in system
ENOBUFS: No buffer space available
ENODATA: No data available
ENODEV: No such device
ENOENT: No such file or directory
ENOEXEC: Exec format error
ENOLCK: No locks available
ENOLINK: Link has been severed
ENOMEM: Cannot allocate memory
ENOMSG: No message of desired type
ENOPROTOOPT: Protocol not available
ENOSPC: No space left on device
ENOSR: Out of streams resources
ENOSTR: Device not a stream
ENOSYS: Function not implemented
ENOTCONN: Transport endpoint is not connected
ENOTDIR: Not a directory
ENOTEMPTY: Directory not empty
ENOTRECOVERABLE: State not recoverable
ENOTSOCK: Socket operation on non-socket
ENOTSUP: Operation not supported
ENOTTY: Inappropriate ioctl for device
ENXIO: No such device or address
EOPNOTSUPP: Operation not supported
EOVERFLOW: Value too large for defined data type
EOWNERDEAD: Owner died
EPERM: Operation not permitted
EPIPE: Broken pipe
EPROTO: Protocol error
EPROTONOSUPPORT: Protocol not supported
EPROTOTYPE: Protocol wrong type for socket
ERANGE: Numerical result out of range
EROFS: Read-only file system
ESPIPE: Illegal seek
ESRCH: No such process
ETIME: Timer expired
ETIMEDOUT: Connection timed out
ETXTBSY: Text file busy
EWOULDBLOCK: Resource temporarily unavailable
EXDEV: Invalid cross-device link
参阅
(C++11) |
列出所有标准 <cerrno> 宏常量的 std::error_condition 枚举 (类) |
| 展开成 POSIX 兼容的线程局域错误号变量的宏 (宏变量) | |
| 显示对应当前错误的字符串于 stderr (函数) | |
| 返回给定错误码的文本版本 (函数) | |
错误号的 C 文档
| |