log.h

来自「Linux 的最重要的特徵之一是它的为许多不同的文件系统的支持。这使其非常灵活从」· C头文件 代码 · 共 83 行

#include <stdio.h>
#include "structure.h"

int login(uid,passwd)
unsigned short uid;
char *passwd;
{
	int i,j;
	char * a;
	fseek(fd,DATASTART+BLOCKSIZ*2,SEEK_SET);
	fread(pwd,1,sizeof(struct pwd)*PWDNUM,fd);

	i=pwd[2].p_uid;
	a=pwd[2].password;

	for(i=0;i<PWDNUM;i++)
	{
		if((uid==pwd[i].p_uid)&&((strcmp(passwd,pwd[i].password)==0)))
		{
			j=0;
			while(j<USERNUM)
			{
				if(user[j].u_uid==0)
				{
					break;
				}else
				{
					j++;
				}
			}
			if(j==USERNUM)
			{
				printf("\ntoo much user in the system,waited to login\n");
				return 0;
			}
			else
			{
				user[j].u_uid=uid;
				user[j].u_gid=pwd[i].p_gid;
				user[j].u_default_mode=DEFAULTMODE;
			}
			break;
		}
	}
	if(i==PWDNUM)
	{
		printf("\nincorrect password\n");
		return 0;
	}
	else
	{
		return 1;
	}
}

int logout(uid)
unsigned short uid;
{
	int i,j,sys_no;
	struct inode *inode;

	for(i=0;i<USERNUM;i++)
		if(uid==user[i].u_uid) break;
	if(i==USERNUM)
	{
		printf("\nno such a file\n");
		return (int)NULL;
	}

	for(j=0;j<NOFILE;j++)
	{
		if(user[i].u_ofile[j]!=SYSOPENFILE+1)
		{
			sys_no=user[i].u_ofile[j];
			inode=sys_ofile[sys_no].f_inode;
			iput(inode);
			sys_ofile[sys_no].f_count--;
			user[i].u_ofile[j]=SYSOPENFILE+1;
		}
	}
	return 1;
}