log.c

来自「操作系统实验,文件系统,c语言实现的」· C语言 代码 · 共 137 行

#include <stdio.h>

#include "filesys.h"

int login(uid,passwd)

unsigned short uid;

char * passwd;

{

 int i,j;

 for(i=0;i<PWDNUM;i++)

 {

   if((uid==pwd[i].p_uid)&&(!strcmp(passwd,pwd[i].password)))

   {

     for(j=0;j<USERNUM;j++)

       if(user[j].u_uid==0) break;

     if(j==USERNUM)

     {

       printf("\ntoo much user in the system,walted 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;

        user_id=j;

     }

     break;

   }

}

 if(i==PWDNUM)

 {

   printf("\nincorrect password\n");

printf("log---->out\n");

   return 0;

 }

 else

{ 

printf("\nyour uid:%d\n",uid);

 printf("your password:%s\n",passwd);

printf("log---->out\n");

 return 1;

}

}

int logout(uid)    /* logout */

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 NULL;

  }

  for(j=0;j<NOFILE;j++)

  {

    if(user[i].u_ofile[j]!=SYSOPENFILE+1)

    {

      /* iput the inode free the sys_ofile and clear the user_ofile */

      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;

}