錯誤號

在 <cerrno> 中定義的每個宏都擴充套件為型別為 int 的整型常量表達式，每個表示式都具有正值，與大多數 POSIX 錯誤碼匹配。定義了以下常量（實現可以定義更多，只要它們以 'E' 後跟數字或大寫字母開頭）。

定義於標頭檔案 `<cerrno>`
E2BIG (C++11)	引數列表過長 (宏常量)
EACCES (C++11)	許可權被拒絕 (宏常量)
EADDRINUSE (C++11)	地址已在使用 (宏常量)
EADDRNOTAVAIL (C++11)	地址不可用 (宏常量)
EAFNOSUPPORT (C++11)	地址族不支援 (宏常量)
EAGAIN (C++11)	資源不可用，請重試 (宏常量)
EALREADY (C++11)	連線已在進行中 (宏常量)
EBADF (C++11)	錯誤的檔案描述符 (宏常量)
EBADMSG (C++11)	錯誤的訊息 (宏常量)
EBUSY (C++11)	裝置或資源忙 (宏常量)
ECANCELED (C++11)	操作已取消 (宏常量)
ECHILD (C++11)	無子程序 (宏常量)
ECONNABORTED (C++11)	連線已中止 (宏常量)
ECONNREFUSED (C++11)	連線被拒絕 (宏常量)
ECONNRESET (C++11)	連線已重置 (宏常量)
EDEADLK (C++11)	將發生資源死鎖 (宏常量)
EDESTADDRREQ (C++11)	需要目標地址 (宏常量)
EDOM	數學引數超出函式域 (宏常量)
EEXIST (C++11)	檔案已存在 (宏常量)
EFAULT (C++11)	錯誤的地址 (宏常量)
EFBIG (C++11)	檔案過大 (宏常量)
EHOSTUNREACH (C++11)	主機不可達 (宏常量)
EIDRM (C++11)	識別符號已移除 (宏常量)
EILSEQ (C++11)	非法位元組序列 (宏常量)
EINPROGRESS (C++11)	操作正在進行中 (宏常量)
EINTR (C++11)	中斷的函式 (宏常量)
EINVAL (C++11)	無效引數 (宏常量)
EIO (C++11)	I/O 錯誤 (宏常量)
EISCONN (C++11)	套接字已連線 (宏常量)
EISDIR (C++11)	是目錄 (宏常量)
ELOOP (C++11)	符號連結級別過多 (宏常量)
EMFILE (C++11)	檔案描述符值過大 (宏常量)
EMLINK (C++11)	連結過多 (宏常量)
EMSGSIZE (C++11)	訊息過大 (宏常量)
ENAMETOOLONG (C++11)	檔名過長 (宏常量)
ENETDOWN (C++11)	網路已關閉 (宏常量)
ENETRESET (C++11)	網路中止連線 (宏常量)
ENETUNREACH (C++11)	網路不可達 (宏常量)
ENFILE (C++11)	系統中開啟檔案過多 (宏常量)
ENOBUFS (C++11)	無可用緩衝區空間 (宏常量)
ENODATA (C++11)	STREAM 頭讀取佇列上無可用訊息 (宏常量)
ENODEV (C++11)	無此裝置 (宏常量)
ENOENT (C++11)	無此檔案或目錄 (宏常量)
ENOEXEC (C++11)	可執行檔案格式錯誤 (宏常量)
ENOLCK (C++11)	無可用鎖 (宏常量)
ENOLINK (C++11)	連結已斷開 (宏常量)
ENOMEM (C++11)	空間不足 (宏常量)
ENOMSG (C++11)	無所需型別的訊息 (宏常量)
ENOPROTOOPT (C++11)	協議不可用 (宏常量)
ENOSPC (C++11)	裝置上無剩餘空間 (宏常量)
ENOSR (C++11)	無 STREAM 資源 (宏常量)
ENOSTR (C++11)	不是 STREAM (宏常量)
ENOSYS (C++11)	函式不支援 (宏常量)
ENOTCONN (C++11)	套接字未連線 (宏常量)
ENOTDIR (C++11)	不是目錄 (宏常量)
ENOTEMPTY (C++11)	目錄不為空 (宏常量)
ENOTRECOVERABLE (C++11)	狀態不可恢復 (宏常量)
ENOTSOCK (C++11)	不是套接字 (宏常量)
ENOTSUP (C++11)	不支援 (宏常量)
ENOTTY (C++11)	不適當的 I/O 控制操作 (宏常量)
ENXIO (C++11)	無此裝置或地址 (宏常量)
EOPNOTSUPP (C++11)	套接字上不支援此操作 (宏常量)
EOVERFLOW (C++11)	值過大無法儲存在資料型別中 (宏常量)
EOWNERDEAD (C++11)	前一個所有者已死亡 (宏常量)
EPERM (C++11)	操作不允許 (宏常量)
EPIPE (C++11)	管道破裂 (宏常量)
EPROTO (C++11)	協議錯誤 (宏常量)
EPROTONOSUPPORT (C++11)	協議不支援 (宏常量)
EPROTOTYPE (C++11)	套接字協議型別錯誤 (宏常量)
ERANGE	結果過大 (宏常量)
EROFS (C++11)	只讀檔案系統 (宏常量)
ESPIPE (C++11)	無效的尋道 (宏常量)
ESRCH (C++11)	無此程序 (宏常量)
ETIME (C++11)	流 ioctl() 超時 (宏常量)
ETIMEDOUT (C++11)	連線超時 (宏常量)
ETXTBSY (C++11)	文字檔案忙 (宏常量)
EWOULDBLOCK (C++11)	操作將阻塞 (宏常量)
EXDEV (C++11)	跨裝置連結 (宏常量)

所有值都必須是唯一的，但 EOPNOTSUPP 和 ENOTSUP 的值可以相同，並且 EAGAIN 和 EWOULDBLOCK 的值可以相同。

[編輯] 示例

執行此程式碼

#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 );
}

可能的輸出

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

[編輯] 參閱

errc (C++11)	std::error_condition 列舉列出所有標準 `<cerrno>` 宏常量 (類) [編輯]
errno	擴充套件為 POSIX 相容的執行緒區域性錯誤碼變數的宏 (宏變數)[編輯]
perror	將當前錯誤的字串顯示到 stderr (函式) [編輯]
strerror	返回給定錯誤程式碼的文字版本 (函式) [編輯]
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