4. [20 points] Unix I/O and file operations [10 points] Suppose that the file "tmpdata.txt" contains "abcdefghijk". If the following code is executed correctly without generating any errors. a. 1: int fd; 2: char buf [6]12345"; 3: fd-open ("tmpdata. txt", 0 RDONLY); 4: fork) 5: read (fd, buf, 2)i 6: read (fd, buf+2, 2); 7: printf ("%d: %s ", (long ) getpid ( ), buf); i). [5pt] Explain if the following two outputs are possible or not? Why/why not? Suppose parent's pid is 7 while child's pid is 8. 7:a2bc5 8:a2b45 7: a2c45 8:b2de5 ii. [5pt] What could be the outputs if the lines 3 and 4 are exchanged? Write at least 3 possible outputs. Suppose parent's pid is 7 while child's pid is 8. 4. [20 points] Unix I/O and file operations [10 points] Suppose that the file "tmpdata.txt" contains "abcdefghijk". If the following code is executed correctly without generating any errors. a. 1: int fd; 2: char buf [6]12345"; 3: fd-open ("tmpdata. txt", 0 RDONLY); 4: fork) 5: read (fd, buf, 2)i 6: read (fd, buf+2, 2); 7: printf ("%d: %s ", (long ) getpid ( ), buf); i). [5pt] Explain if the following two outputs are possible or not? Why/why not? Suppose parent's pid is 7 while child's pid is 8. 7:a2bc5 8:a2b45 7: a2c45 8:b2de5 ii. [5pt] What could be the outputs if the lines 3 and 4 are exchanged? Write at least 3 possible outputs. Suppose parent's pid is 7 while child's pid is 8