open()打开文件失败对应的各种错误码

open()打开文件失败错误码：

获取错误信息实例：

　　　　HANDLE hFile = 0;
　　　　hFile = open(“c:	est.txt”, O_RDWR, S_IRWXU|S_IRWXG|S_IRWXO);
        if (-1 == hFile)
        {
            
            printf("Error %d: Failed to open file
", errno);

            
            
            if (errno == EEXIST )
            {
               printf("EEXIST 参数pathname 所指的文件已存在, 却使用了O_CREAT 和O_EXCL 旗标. 
");
               
            }else if(errno == EACCES)
            {
                 printf("EACCESS 参数pathname 所指的文件不符合所要求测试的权限.
");
                  
            }else if(errno == EROFS)
            {
                 printf("EROFS 欲测试写入权限的文件存在于只读文件系统内.
");
            }else ......
    
            
            
            
        }
        

注：使用errno 需要加上头文件：

#include <errno.h> 

#define    EPERM        　1        /* Operation not permitted */
#define    ENOENT         2        /* No such file or directory */
#define    ESRCH          3        /* No such process */
#define    EINTR          4        /* Interrupted system call */
#define    EIO            5        /* Input/output error */
#define    ENXIO          6        /* Device not configured */
#define    E2BIG          7        /* Argument list too long */
#define    ENOEXEC        8        /* Exec format error */
#define    EBADF          9        /* Bad file descriptor */
#define    ECHILD         10        /* No child processes */
#define    EDEADLK        11        /* Resource deadlock avoided */
                    /* 11 was EAGAIN */
#define    ENOMEM         12        /* Cannot allocate memory */
#define    EACCES         13        /* Permission denied */
#define    EFAULT         14        /* Bad address */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    ENOTBLK        15        /* Block device required */
#endif
#define    EBUSY          16        /* Device / Resource busy */
#define    EEXIST         17        /* File exists */
#define    EXDEV          18        /* Cross-device link */
#define    ENODEV         19        /* Operation not supported by device */
#define    ENOTDIR        20        /* Not a directory */
#define    EISDIR         21        /* Is a directory */
#define    EINVAL         22        /* Invalid argument */
#define    ENFILE         23        /* Too many open files in system */
#define    EMFILE         24        /* Too many open files */
#define    ENOTTY         25        /* Inappropriate ioctl for device */
#define    ETXTBSY        26        /* Text file busy */
#define    EFBIG          27        /* File too large */
#define    ENOSPC         28        /* No space left on device */
#define    ESPIPE         29        /* Illegal seek */
#define    EROFS          30        /* Read-only file system */
#define    EMLINK         31        /* Too many links */
#define    EPIPE          32        /* Broken pipe */

/* math software */
#define    EDOM           33        /* Numerical argument out of domain */
#define    ERANGE         34        /* Result too large */

/* non-blocking and interrupt i/o */
#define    EAGAIN         35        /* Resource temporarily unavailable */
#define    EWOULDBLOCK    EAGAIN        /* Operation would block */
#define    EINPROGRESS    36        /* Operation now in progress */
#define    EALREADY       37        /* Operation already in progress */

/* ipc/network software -- argument errors */
#define    ENOTSOCK       38        /* Socket operation on non-socket */
#define    EDESTADDRREQ   39        /* Destination address required */
#define    EMSGSIZE       40        /* Message too long */
#define    EPROTOTYPE     41        /* Protocol wrong type for socket */
#define    ENOPROTOOPT    42        /* Protocol not available */
#define    EPROTONOSUPPORT   43        /* Protocol not supported */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    ESOCKTNOSUPPORT   44        /* Socket type not supported */
#endif
#define ENOTSUP              45        /* Operation not supported */

#define    EPFNOSUPPORT      46        /* Protocol family not supported */
#endif
#define    EAFNOSUPPORT      47        /* Address family not supported by protocol family */
#define    EADDRINUSE        48        /* Address already in use */
#define    EADDRNOTAVAIL     49        /* Can't assign requested address */

/* ipc/network software -- operational errors */
#define    ENETDOWN          50        /* Network is down */
#define    ENETUNREACH       51        /* Network is unreachable */
#define    ENETRESET         52        /* Network dropped connection on reset */
#define    ECONNABORTED      53        /* Software caused connection abort */
#define    ECONNRESET        54        /* Connection reset by peer */
#define    ENOBUFS           55        /* No buffer space available */
#define    EISCONN           56        /* Socket is already connected */
#define    ENOTCONN          57        /* Socket is not connected */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    ESHUTDOWN         58        /* Can't send after socket shutdown */
#define    ETOOMANYREFS      59        /* Too many references: can't splice */
#endif
#define    ETIMEDOUT         60        /* Operation timed out */
#define    ECONNREFUSED      61        /* Connection refused */

#define    ELOOP             62        /* Too many levels of symbolic links */
#define    ENAMETOOLONG      63        /* File name too long */

/* should be rearranged */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    EHOSTDOWN         64        /* Host is down */
#endif
#define    EHOSTUNREACH      65        /* No route to host */
#define    ENOTEMPTY         66        /* Directory not empty */

/* quotas & mush */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    EPROCLIM          67        /* Too many processes */
#define    EUSERS            68        /* Too many users */
#endif
#define    EDQUOT            69        /* Disc quota exceeded */

/* Network File System */
#define    ESTALE            70        /* Stale NFS file handle */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    EREMOTE           71        /* Too many levels of remote in path */
#define    EBADRPC           72        /* RPC struct is bad */
#define    ERPCMISMATCH      73        /* RPC version wrong */
#define    EPROGUNAVAIL      74        /* RPC prog. not avail */
#define    EPROGMISMATCH     75        /* Program version wrong */
#define    EPROCUNAVAIL      76        /* Bad procedure for program */
#endif

#define    ENOLCK            77        /* No locks available */
#define    ENOSYS            78        /* Function not implemented */

#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    EFTYPE            79        /* Inappropriate file type or format */
#define    EAUTH             80        /* Authentication error */
#define    ENEEDAUTH         81        /* Need authenticator */

/* Intelligent device errors */
#define    EPWROFF           82    /* Device power is off */
#define    EDEVERR           83    /* Device error, e.g. paper out */
#endif

#define    EOVERFLOW         84        /* Value too large to be stored in data type */

/* Program loading errors */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define EBADEXEC             85    /* Bad executable */
#define EBADARCH             86    /* Bad CPU type in executable */
#define ESHLIBVERS           87    /* Shared library version mismatch */
#define EBADMACHO            88    /* Malformed Macho file */
#endif

#define    ECANCELED         89        /* Operation canceled */

#define EIDRM                90        /* Identifier removed */
#define ENOMSG               91        /* No message of desired type */   
#define EILSEQ               92        /* Illegal byte sequence */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define ENOATTR              93        /* Attribute not found */
#endif

#define EBADMSG              94        /* Bad message */
#define EMULTIHOP            95        /* Reserved */
#define    ENODATA           96        /* No message available on STREAM */
#define ENOLINK              97        /* Reserved */
#define ENOSR                98        /* No STREAM resources */
#define ENOSTR               99        /* Not a STREAM */
#define    EPROTO            100        /* Protocol error */
#define ETIME                101        /* STREAM ioctl timeout */

#if __DARWIN_UNIX03 || defined(KERNEL)
/* This value is only discrete when compiling __DARWIN_UNIX03, or KERNEL */
#define    EOPNOTSUPP        102        /* Operation not supported on socket */
#endif /* __DARWIN_UNIX03 || KERNEL */

#define ENOPOLICY            103        /* No such policy registered */

#if __DARWIN_C_LEVEL >= 200809L
#define ENOTRECOVERABLE      104        /* State not recoverable */
#define EOWNERDEAD           105        /* Previous owner died */
#endif

#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define    EQFULL            106        /* Interface output queue is full */
#define    ELAST             106        /* Must be equal largest errno */