halt.c

基于UNIX6的文件系统模拟程序

#include <stdio.h>
#include <stdlib.h>
#include "filesys.h"

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_ofile[j]);
					user[i].u_ofile[j] = SYSOPENFILE+1;
				}
			}
		}
	}

	/* 3. write back the filesus 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("\nThe FileSystem is terminated!\nPress any to exit...");
	getch();
	//exit(0);
}