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Linux系统编程调试手段之错误号

  • 2026-03-19 10:20:29
Linux系统编程调试手段之错误号

一、一些概念

1.在Linux系统编程中,当调用系统调用(如open、read、write等)或标准库函数失败时,函数通常会返回一个错误值(如-1),同时会将全局变量errno设置为一个特定的整数,这个整数就代表具体的错误类型;

2.errno这个全局变量在<errno.h>头文件中声明;

3.错误处理函数:

1)perror:直接打印自定义信息 + 错误描述(自动获取当前errno);

2)strerror:将错误号转换为字符串描述(需包含<string.h>)。

二、Linux系统编程中最常用的错误号

错误号宏	 数值	      含义	                  		      典型产生场景	ENOENT	      2	    No such file or directory		打开不存在的文件 / 目录、访问路径中不存在的组件	EINVAL	      22	Invalid argument				给函数传递了无效参数(如open的 flag 非法、write的 fd 无效)	EACCES	      13	Permission denied				权限不足(如读无读权限的文件、写只读文件、执行无执行权限的程序)	EEXIST	      17	File exists						创建已存在的文件(如open用 `O_CREAT	O_EXCL` 标志)、创建已存在的目录EBADF	      9	    Bad file descriptor				使用无效的文件描述符(如关闭已关闭的 fd、用读模式 fd 写)	ENOMEM	      12	Out of memory					系统内存不足,无法分配(如malloc、brk失败)	EIO	          5	    Input/output error				底层 I/O 错误(如磁盘损坏、读写已移除的 U 盘)	ENOSPC	      28	No space left on device			磁盘空间不足(如writemkdir失败)	EPERM	      1	    Operation not permitted		    无权限执行操作(如普通用户 kill root 进程、修改系统级配置)		EINTR	      4	    Interrupted system call	        系统调用被信号中断(如read时收到SIGINT)	ENFILE	      23	Too many open files in system	系统级打开文件数达到上限	EMFILE	      24	Too many open files	            进程级打开文件数达到上限(默认 1024)	 详细查看方式cat /usr/include/asm-generic/errno-base.hcat /usr/include/asm-generic/errno.h

三、测试

main.c

#include<stdio.h>#include<stdlib.h>#include<fcntl.h>#include<unistd.h>#include<errno.h>#include<string.h>intmain(){    // 尝试打开不存在的文件    int fd = open("./nonexist.txt", O_RDONLY);    if (fd == -1) {        // 方法1:直接打印错误号和对应描述        printf("Open failed, errno: %d, reason: %s\n", errno, strerror(errno));        // 方法2:使用perror(自动拼接自定义信息和错误描述)        perror("Open failed");        // 方法3:根据错误号分支处理        if (errno == ENOENT) {            printf("File does not exist\n");        } else if (errno == EACCES) {            printf("Permission denied\n");        }        exit(EXIT_FAILURE);    }    close(fd);    return 0;}

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  1. CONNECT:[ UseTime:0.000590s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000872s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000347s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000496s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000496s ]
  8. SELECT * FROM `article` WHERE `id` = 478086 LIMIT 1 [ RunTime:0.002019s ]
  9. UPDATE `article` SET `lasttime` = 1774631349 WHERE `id` = 478086 [ RunTime:0.005138s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000417s ]
  11. SELECT * FROM `article` WHERE `id` < 478086 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000423s ]
  12. SELECT * FROM `article` WHERE `id` > 478086 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002545s ]
  13. SELECT * FROM `article` WHERE `id` < 478086 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000827s ]
  14. SELECT * FROM `article` WHERE `id` < 478086 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004568s ]
  15. SELECT * FROM `article` WHERE `id` < 478086 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007733s ]
0.094247s