Finishing Chapter 18

• We have discussed this, but you should read Chapter 18
  • He does a nice job of discussing inodes, files and directories.
• Some additional system calls for files and directories.
  • link

    •        #include <unistd.h>
             int link(const char *oldpath, const char *newpath);
      	   

    • If newpath exists it will not be overwritten.
    • The man page says "it is impossible to tell which name was the "original"
    • Oldpath and newpath must be on the same file system.
  • We have already looked at unlink.
  • rename

    • #include <stdio.h>
      int rename(const char *oldpath, const char *newpath);
      	    

    • If newpath exists, it will be overwritten.
    • If oldpath and newpath are hard links to the same file nothing happens.
    • If the execution fails, the old file is not removed.
  • symlink

    •        #include <unistd.h>
             int symlink(const char *target, const char *linkpath);
      	  

    • Permissions on symbolic links are ignored.
  • mkdir

    •        #include <sys/stat.h>
             #include <sys/types.h>
             int mkdir(const char *pathname, mode_t mode);pre>
      
      	   

    • owned by effective userid
    • Permissions as before.
  • rmdir

    •        #include <unistd.h>
             int rmdir(const char *pathname);