code:smdate - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki

这个函数违背了文件修改时间的原则(修改按时间顺序进行)，用户可以随意设置修改时间

3587

3588 /*

3589 * Change modified date of file:

3590 * time to r0-r1; sys smdate; file

3591 * This call has been withdrawn because it messes up

3592 * incremental dumps (pseudo-old files aren’t dumped).

3593 * It works though and you can uncomment it if you like.

3594

3595 smdate()

3596 {

3597 register struct inode *ip;

3598 register int *tp;

3599 int tbuf[2];

3600

3601 if ((ip = owner()) == NULL)

3602 return;

3603 ip->i_flag =| IUPD;

3604 tp = &tbuf[2];

3605 *--tp = u.u_ar0[R1];

3606 *--tp = u.u_ar0[R0];

tbuf[1] ← u.u_ar0[R1]

tbuf[0] ← u.u_ar0[R0]

3607 iupdat(ip, tp);

3608 ip->i_flag =& ~IUPD;

3609 iput(ip);

3610 }

3611 */

3612 /* ------------------------- */