... parentAllocate child's stack and user areaFill child's user area from parentAllocate PID for childSet up child to share parent's textCopy page tables for data and stackSet up sharing ... 12131415(b)(c)Process A& apos;ssharedlock A& apos;s shared lockB's shared lockC's shared lock A B45 67 45 678 92345 89101 17 6Fig. 10- 27. (a) A file with one lock. (b) Addition of a second lock.(c) A ... an error has occurred; a and addr arememory addresses, len is a length, prot controls protection, flagsare miscellaneous bits, fd is a file descriptor, and offset is a fileoffset.Page frame3Page...