chmod

• So what does chmod do?

     int result = chmod("blookus", 0644);

• blookus is looked up as usual

• The result is an inode (or some error condition)

• The owner of the inode is checked against the owner of the process

• If they match, the kernel sets the mode in the inode:

             umode_t                    i_mode;        drwxr-xr-x

• Also it updates the "ctime":

             struct timespec            i_ctime;

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Copyright © 2007 M. J. Dominus