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社区首页 >专栏 >errno.h是什么头文件(unistd.h是什么头文件)

errno.h是什么头文件(unistd.h是什么头文件)

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全栈程序员站长
发布2022-07-31 16:54:50
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发布2022-07-31 16:54:50
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大家好,又见面了,我是你们的朋友全栈君。

注意: 只有当一个库函数失败时,errno才会被设置。当函数成功运行时,errno的值不会被修改。这意味着我们不能通过测试errno的值来判断是否有错误存在。反之,只有当被调用的函数提示有错误发生时检查errno的值才有意义。

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。

以下来主要自2.6.32的内核代码中的/usr/include/asm-generic/errno.h及errno-base.h,输出错误原因定义归纳整理如下:

#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 /* I/O error */   #define ENXIO 6 /* No such device or address */   #define E2BIG 7 /* Argument list too long */   #define ENOEXEC 8 /* Exec format error */   #define EBADF 9 /* Bad file number */   #define ECHILD 10 /* No child processes */   #define EAGAIN 11 /* Try again */   #define ENOMEM 12 /* Out of memory */   #define EACCES 13 /* Permission denied */   #define EFAULT 14 /* Bad address */   #define ENOTBLK 15 /* Block device required */   #define EBUSY 16 /* Device or resource busy */   #define EEXIST 17 /* File exists */   #define EXDEV 18 /* Cross-device link */   #define ENODEV 19 /* No such device */   #define ENOTDIR 20 /* Not a directory */   #define EISDIR 21 /* Is a directory */   #define EINVAL 22 /* Invalid argument */   #define ENFILE 23 /* File table overflow */   #define EMFILE 24 /* Too many open files */   #define ENOTTY 25 /* Not a typewriter */   #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 */   #define EDOM 33 /* Math argument out of domain of func */   #define ERANGE 34 /* Math result not representable */   #define EDEADLK 35 /* Resource deadlock would occur */   #define ENAMETOOLONG 36 /* File name too long */   #define ENOLCK 37 /* No record locks available */   #define ENOSYS 38 /* Function not implemented */   #define ENOTEMPTY 39 /* Directory not empty */   #define ELOOP 40 /* Too many symbolic links encountered */   #define EWOULDBLOCK EAGAIN /* Operation would block */   #define ENOMSG 42 /* No message of desired type */   #define EIDRM 43 /* Identifier removed */   #define ECHRNG 44 /* Channel number out of range */   #define EL2NSYNC 45 /* Level 2 not synchronized */   #define EL3HLT 46 /* Level 3 halted */   #define EL3RST 47 /* Level 3 reset */   #define ELNRNG 48 /* Link number out of range */   #define EUNATCH 49 /* Protocol driver not attached */   #define ENOCSI 50 /* No CSI structure available */   #define EL2HLT 51 /* Level 2 halted */   #define EBADE 52 /* Invalid exchange */   #define EBADR 53 /* Invalid request descriptor */   #define EXFULL 54 /* Exchange full */   #define ENOANO 55 /* No anode */   #define EBADRQC 56 /* Invalid request code */   #define EBADSLT 57 /* Invalid slot */   #define EDEADLOCK EDEADLK   #define EBFONT 59 /* Bad font file format */   #define ENOSTR 60 /* Device not a stream */   #define ENODATA 61 /* No data available */   #define ETIME 62 /* Timer expired */   #define ENOSR 63 /* Out of streams resources */   #define ENONET 64 /* Machine is not on the network */   #define ENOPKG 65 /* Package not installed */   #define EREMOTE 66 /* Object is remote */   #define ENOLINK 67 /* Link has been severed */   #define EADV 68 /* Advertise error */   #define ESRMNT 69 /* Srmount error */   #define ECOMM 70 /* Communication error on send */   #define EPROTO 71 /* Protocol error */   #define EMULTIHOP 72 /* Multihop attempted */   #define EDOTDOT 73 /* RFS specific error */   #define EBADMSG 74 /* Not a data message */   #define EOVERFLOW 75 /* Value too large for defined data type */   #define ENOTUNIQ 76 /* Name not unique on network */   #define EBADFD 77 /* File descriptor in bad state */   #define EREMCHG 78 /* Remote address changed */   #define ELIBACC 79 /* Can not access a needed shared library */   #define ELIBBAD 80 /* Accessing a corrupted shared library */   #define ELIBSCN 81 /* .lib section in a.out corrupted */   #define ELIBMAX 82 /* Attempting to link in too many shared libraries */   #define ELIBEXEC 83 /* Cannot exec a shared library directly */   #define EILSEQ 84 /* Illegal byte sequence */   #define ERESTART 85 /* Interrupted system call should be restarted */   #define ESTRPIPE 86 /* Streams pipe error */   #define EUSERS 87 /* Too many users */   #define ENOTSOCK 88 /* Socket operation on non-socket */   #define EDESTADDRREQ 89 /* Destination address required */   #define EMSGSIZE 90 /* Message too long */   #define EPROTOTYPE 91 /* Protocol wrong type for socket */   #define ENOPROTOOPT 92 /* Protocol not available */   #define EPROTONOSUPPORT 93 /* Protocol not supported */   #define ESOCKTNOSUPPORT 94 /* Socket type not supported */   #define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */   #define EPFNOSUPPORT 96 /* Protocol family not supported */   #define EAFNOSUPPORT 97 /* Address family not supported by protocol */   #define EADDRINUSE 98 /* Address already in use */   #define EADDRNOTAVAIL 99 /* Cannot assign requested address */   #define ENETDOWN 100 /* Network is down */   #define ENETUNREACH 101 /* Network is unreachable */   #define ENETRESET 102 /* Network dropped connection because of reset */   #define ECONNABORTED 103 /* Software caused connection abort */   #define ECONNRESET 104 /* Connection reset by peer */   #define ENOBUFS 105 /* No buffer space available */   #define EISCONN 106 /* Transport endpoint is already connected */   #define ENOTCONN 107 /* Transport endpoint is not connected */   #define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */   #define ETOOMANYREFS 109 /* Too many references: cannot splice */   #define ETIMEDOUT 110 /* Connection timed out */   #define ECONNREFUSED 111 /* Connection refused */   #define EHOSTDOWN 112 /* Host is down */   #define EHOSTUNREACH 113 /* No route to host */   #define EALREADY 114 /* Operation already in progress */   #define EINPROGRESS 115 /* Operation now in progress */   #define ESTALE 116 /* Stale NFS file handle */   #define EUCLEAN 117 /* Structure needs cleaning */   #define ENOTNAM 118 /* Not a XENIX named type file */   #define ENAVAIL 119 /* No XENIX semaphores available */   #define EISNAM 120 /* Is a named type file */   #define ENOKEY 126 /* Required key not available */   #define EKEYEXPIRED 127 /* Key has expired */   #define EKEYREVOKED 128 /* Key has been revoked */   #define EKEYREJECTED 129 /* Key was rejected by service */   #define EOWNERDEAD 130 /* Owner died */   #define ENOTRECOVERABLE 131 /* State not recoverable */   #define ERFKILL 132 /* Operation not possible due to RF-kill */   #define EHWPOISON 133 /* Memory page has hardware error */

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原始发表:2022年4月1,如有侵权请联系 cloudcommunity@tencent.com 删除

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