linux errno错误码及strerror打印错误码对应的内容_xiaokuang5020的博客

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1.errno

头文件：include<errno.h>

errno用于Linux下的错误捕获，在运行creat（），open（），write（）之类的函数时有些时候会调用失败返回-1，这时候若在程序中include<errno.h>这个头文件，每次发生错误时，系统会自动用错误代码填充errno这个全局变量。这对于调试程序有很大帮助。

errno的错误定义：

#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 */

2.strerror

头文件：include<string.h>

函数原型：

char *strerror(int errnum);
char *_strerror(const char *strErrMsg);
wchar_t *_wcserror(int errnum);
wchar_t *__wcserror(const wchar_t *strErrMsg)

通过标准错误的编号，获得错误的描述字符串，方便用户查找，返回值是指向错误信息的指针。
---------------------
作者：G____yiyi
来源：CSDN
原文：https://blog.csdn.net/yiyi__baby/article/details/45557679?utm_source=copy
版权声明：本文为博主原创文章，转载请附上博文链接！

void per ror (const char *msg); 1. errno 变量文件中定义了符号 errno 以及可以赋予它的各种常量,这些常量都是以字符 E 开头。例如,若 errno 等于常量 EACCES,表示产生了权限问题(例如,没有打开所要求文件的足够权限)。 errno 特点： 1、当出错的时候， errno 会自动被赋值。一个int数据如下图所示，将头文件挨个进行去掉，通过编译结果观察错误是否还存在。如果存在就说明问题不在这个头文件，要是在的话，就说明问题出现在这个头文件中。创建的函数的入口参数是指针类型，在调用这个函数的时候，传入这个函数的形参为指针形式，在利用这个指针进行调用变量的时候，就会出现。这种问题一般头文件中函数的声明出现问题，例如缺少分号“；”，或者是声明的函数缺少“（”等情况。这种情况一般是指针地址赋值的问题。对代码的指针地址赋值问题进行检查处理。（2）去对定位的头文件查找函数声明的语法问题。编译环境：VS2015 ========================= 在vs2015环境下使用fopen方式打开文件会报错，大概内容是不安全（unsafe）。网上的解决办法主要分为两种：第一种是改配置环境：https://jingyan.baidu.com/article/ce436649fd61543773afd32e.html百度外部变量 errno 保存库程序中实现定义的 错误码 ，通常被定义为 errno .h中以E开头的宏，所有 错误码 都是正整数，如下例子 # define EDOM 33 /* Math argument out of 目录一回顾二错误打印三单个线程退出实验1四单个线程退出实验2五单个线程退出实验3 1 用 pthread_create 函数并且在main最后加上sleep（2）； 2 看到了明显的父子线程抢占现象 3 本质和fork 函数类似接上一次内容继续加上一点东西二错误打印不可以用 per ror 函数引出一个s trer ror 函数形参为 pthread_create函数返回值 #include<stdio.h> #include &l linux errno 查看和使用_believe209的博客-CSDN博客_ linux 获取 errno Linux 网络编程常见 错误码 及分析_Justice_Gao的博客-CSDN博客 Linux socket里的send和recv，阻塞与非阻塞socket、TCP与UDP的区别_瓶子里de肥皂泡的博客-CSDN博客同步、异步、阻塞、非阻塞，以及IO模型的理解_落尘纷扰的博客-CSDN博客 Linux 下netstat命令详解_NoFaceNoSkin的博客-CSDN博客_netstat命令它是基于 errno 的当前值，在标准错误输出上产生一条出错信息，然后返回。（不需要printf）它先输出由 msg 字符串，然后是一个冒号后头接着对应于 errno 值的出错信息。例： per ror （“sendto”）；打印出：sendto: Permission denied 二、s trer ror #include <string.h> 在 linux 系统中每次调用系统函数都要进行出错信息检查这是应该的，不过为了降低代码的臃肿我做了如下更改原代码：if ((mypid = fork())函数封装：void mys trer ror (char * errstr){fprintf(stderr,"%s : %s/n",errstr,s trer ror ( errno ));exit(0);}现在代码：if ((mypid = f