linux c++(IO & 第三篇 stat）

 #include <stdio.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <string.h>
  #include <time.h>
  #include <pwd.h>
  #include <grp.h>

  int main(int argc,char *argv[])
  {
      if(argc != 2)
      {
          printf("./a.out filename\n");
          return -1;
      }
      //调用stat 得到文件的属性信息
      struct stat sb; 
  //    stat(argv[1],&sb);
  /*
   *stat 碰到链接文件，会追溯到源文件，穿透！！ lstat并不会
   * */
      lstat(argv[1],&sb);
      //解析属性信息 st_mode uid gid time
      //st_mode
      char stmode[11] = {0};
      memset(stmode,‘-‘,sizeof(stmode)-1);
      stmode[0] = S_ISREG(sb.st_mode)?‘-‘:‘-‘;
      stmode[0] = S_ISDIR(sb.st_mode)?‘d‘:stmode[0];
      stmode[0] = S_ISCHR(sb.st_mode)?‘c‘:stmode[0];
      stmode[0] = S_ISBLK(sb.st_mode)?‘b‘:stmode[0];
      stmode[0] = S_ISFIFO(sb.st_mode)?‘p‘:stmode[0];
      stmode[0] = S_ISLNK(sb.st_mode)?‘l‘:stmode[0];
      stmode[0] = S_ISSOCK(sb.st_mode)?‘s‘:stmode[0];
      //解析权限
      stmode[1] = sb.st_mode & S_IRUSR?‘r‘:‘-‘;
      stmode[2] = sb.st_mode & S_IWUSR?‘w‘:‘-‘;
      stmode[3] = sb.st_mode & S_IXUSR?‘x‘:‘-‘;
      
      stmode[4] = sb.st_mode & S_IRGRP?‘r‘:‘-‘;
      stmode[5] = sb.st_mode & S_IWGRP?‘w‘:‘-‘;
      stmode[6] = sb.st_mode & S_IXGRP?‘x‘:‘-‘;
  
      stmode[7] = sb.st_mode & S_IROTH?‘r‘:‘-‘;
      stmode[8] = sb.st_mode & S_IWOTH?‘w‘:‘-‘;
      stmode[9] = sb.st_mode & S_IXOTH?‘x‘:‘-‘;
  
      //分析用户名和组名通过函数获得 getpwuid getgrgid
      //时间获取
      struct tm *filetm = localtime(&sb.st_atim.tv_sec);
      char timebuf[20]={0};
      sprintf(timebuf,"%d月    %d %02d:%02d",filetm->tm_mon+1,filetm->tm_mday,filetm->tm_hour,filetm->tm_m
   //   sprintf("-rw-rw-r-- 1 xiaozhao xiaozhao 0 Feb 24 22:15 hello\n");
     printf("%s %d %s %s %d %s %s\n",stmode,sb.st_nlink,getpwuid(sb.st_uid)->pw_name,
            getgrgid(sb.st_gid)->gr_name,sb.st_size,timebuf,argv[1]);
      
      return 0;
  } 

linux c++(IO & 第三篇 stat）

原文：https://www.cnblogs.com/lodger47/p/14727622.html