halt.c

#include "stdio.h"
#include "filesys.h"

void halt()
{
  struct inode *inode;
  int i, j;
  /*1. write back the current dir */
  chdir("..");
  iput(cur_path_inode);
  /*2. free the u_ofile and sys_ofile and inode */
  for (i = 0; i < USERNUM; i++)
    if (user[i].u_uid != 0)
      for (j = 0; j < NOFILE; j++)
        if (user[i].u_ofile[j] != SYSOPENFILE + 1)
        {
          close(user[i].u_uid,user[i].u_ofile[j]);
          user[i].u_ofile[j] = SYSOPENFILE + 1;
        }
  /* 3. write back the filesys to the disk   */
  fseek(fd, BLOCKSIZ, SEEK_SET);
  fwrite(&filsys, 1, sizeof(struct filsys), fd);
  /*4. close the file system column*/
  fclose(fd);
  /*5. say GOOD BYE to all the user */
  printf("\n Good Bye.See You Next Time.Please turn off the switch\n");
  exit(0);
}