stat命令的实现-mysate（课上测试）

提交学习stat（1）的截图

推导出实现stat(1)需要的系统调用，并给出实现stat(1)的伪代码

• 需要的系统调用：readdir() 、closedir()、fstat()、lstat()、fstatat()

• 伪代码

  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <sys/stat.h>
  #include <dirent.h>
  
  int main(int argc, char *argv[]) 
  {
      if (argc < 2) 
      {
          printf("Usage: %s <filename>\n", argv[0]);
          return 1;
      }
      struct stat stat_info;
      int lstat_result = lstat(argv[1], &stat_info);
      if (lstat_result == -1)
      {
          printf("Error: 无法获取 %s 的状态信息\n", argv[1]);
          return 1;
      }
      printf("File status for %s:\n", argv[1]);
      printf("  st_mode: %lu\n", stat_info.st_mode);
      printf("  st_size: %lu\n", stat_info.st_size);
      printf("  st_mtime: %lu\n", stat_info.st_mtime);
      printf("  st_ctime: %lu\n", stat_info.st_ctime);
      return 0;
  }
  

编写产品代码 mystate.c，提交代码

  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <sys/stat.h>
  #include <dirent.h>

  int main(int argc, char *argv[]) {
      if (argc < 2) {
          printf("Usage: %s <filename>\n", argv[0]);
          return 1;
      }

      struct stat stat_info;
      int lstat_result = lstat(argv[1], &stat_info);

      if (lstat_result == -1) {
          printf("Error: 无法获取 %s 的状态信息\n", argv[1]);
          return 1;
      }

      printf("File status for %s:\n", argv[1]);
      printf("  st_mode: %lu\n", stat_info.st_mode);
      printf("  st_size: %lu\n", stat_info.st_size);
      printf("  st_mtime: %lu\n", stat_info.st_mtime);
      printf("  st_ctime: %lu\n", stat_info.st_ctime);
  
      return 0;
  }

测试代码，mystat 与stat（1）对比，提交截图