• stat命令的实现-mysate(20191213兰毅达)


    • 1.提交学习stat(1)的截图
      man 1 stat查看

      作用:获取文件信息
      头文件:include <sys/types.h> #include <sys/stat.h> #include <unistd.h>
      函数原型:int stat(const char *path, struct stat *buf)
      返回值:成功返回0,失败返回-1;
      参数:文件路径(名),struct stat 类型的结构体
    • 2.man -k ,grep -r的使用
      man -k stat | grep 2查找系统调用

      grep -r快速搜索在目录下面的含有关键字的文件
    • 3.伪代码
      查看并存储文件各个属性
      调用函数stat()
      依次打印输出节点ino、
      文件类型mode、
      文件的连接数nlink、
      用户ID uid和组ID gid、
      块大小blksize、
      字节数size、
      块数目blocks、
      三个时间atime、mtime和ctime
    • 4.产品代码 mystate.c
    #include <stdio.h>
    #include <stdlib.h>
    #include <time.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <unistd.h>
    
    int main(int argc, char *argv[])
    {
        struct stat sb;
        if (argc != 2) {
            fprintf(stderr, "Usage: %s <pathname>
    ", argv[0]);
            exit(EXIT_FAILURE);
        }
        if (stat(argv[1], &sb) == -1) {
            perror("stat");
            exit(EXIT_FAILURE);
        }
        printf("File type:                ");
        switch (sb.st_mode & S_IFMT) {
            case S_IFBLK:   printf("block device
    ");
                break;
        case S_IFCHR:   printf("character device
    ");
                break;
        case S_IFDIR:   printf("directory
    ");
                break;
        case S_IFIFO:   printf("FIFO/pipe
    ");
                break;
        case S_IFLNK:   printf("symlink
    ");
                break;
        case S_IFREG:   printf("regular file
    ");
                break;
        case S_IFSOCK:  printf("socket
    ");
                break;
        default:        printf("unknown?
    ");
                break;
        }
        printf("I-node number:            %ld
    ", (long) sb.st_ino);
        printf("Mode:                     %lo (octal)
    ",(unsigned long) sb.st_mode);
        printf("Link count:               %ld
    ", (long) sb.st_nlink);
        printf("Ownership:                UID=%ld   GID=%ld
    ",(long) sb.st_uid, (long) sb.st_gid);
        printf("Preferred I/O block size: %ld bytes
    ",(long) sb.st_blksize);
        printf("File size:                %lld bytes
    ",(long long) sb.st_size);
        printf("Blocks allocated:         %lld
    ",(long long) sb.st_blocks);
        printf("Last status change:       %s", ctime(&sb.st_ctime));
        printf("Last file access:         %s", ctime(&sb.st_atime));
        printf("Last file modification:   %s", ctime(&sb.st_mtime));
        exit(EXIT_SUCCESS);
    }
    

    码云链接:https://gitee.com/lan_yi_da/codes/kc9e0qigpyadl1hu8245m66

    • 5.测试代码,mystat 与stat(1)对比
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  • 原文地址:https://www.cnblogs.com/1301cn/p/15492722.html
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