Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 10, Problem 10.7HW
Program Plan Intro
RIO Buffered Input functions:
- The RIO function is used to copy a text file from standard input to standard output one at a time.
- Rio functions are motivated by the three functions
- “readline” function
- “readn” function
- “writen” function
- The “rio_readn” and “rio_writen” functions are similar to the Stevens “readn” and “writen” functions.
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Assume that the followings are the outputs of ps and jobs commands and answer the following questions according to these outputs.
ps
jobs
PID TTY TIME CMD
6417 pts/0 00:00:00 bash
6458 pts/0 00:00:00 sleep
6459 pts/0 00:00:00 bash
6460 pts/0 00:00:00 sleep
6468 pts/0 00:00:00 cat
6469 pts/0 00:00:00 ps
[1] Running sleep 5000 &
[2]- Running (sleep 250; echo "Hello") &
[3]+ Stopped cat >list.txt
2.
What are the process ID no, job number, and status of the command “sleep 5000”
Process ID:
Job no:
Status:
3.
Write the necessary command line to restart (foreground) the third job in the job list.
Write a program, in assembly language format, to hold a character set at a specific memory location. Each character is entered via the keyboard and ends with the character '!'. Furthermore, the set of characters that have been stored in memory is displayed on the monitor screen. Hint: use the interrupts mentioned in question no 2 above. For example: from the keyboard type 'I', 'L', 'K', 'O', 'M', '!' ; then save it in a certain memory location and the screen display becomes ILKOM. Instructions: create a program in the form of procedures.
BELOW MCQ GIVEN ANSWER CAN BE MORE THAN ONE OPTION. PLEASE PROVIDE CORRECT ANSWERS.
-------------------
Q3 :- The ANSI C function below causes the program in which it runs to malfunction . Which of the following connection will help to perform function successfully ?
/* Return a count of all the bits set in bytes */
int bitcount (unsigned char c)
{
unsigned char x , b , count =0;
for (b = 0 , x= 1 ; !(x & 0x100); ++b, x <<=1) {
if (x | c )
++count;
}
return count;
}
A) change the type of x to a type larger than unsigned char.
B) remove the extraneous variable b.
C) change the return type to unsigned char .
D) change if ( x | c) to if ( x & c) inside the for loop.
E) change ! (c & 0x100) to ( x < 0x100) inside the for loop.
Chapter 10 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 10.3 - Prob. 10.1PPCh. 10.8 - Practice Problem 10.2 (solution page 915) Suppose...Ch. 10.8 - Practice Problem 10.3 (solution page 915) As...Ch. 10.9 - Prob. 10.4PPCh. 10.9 - Practice Problem 10.5 (solution page 916) Assuming...Ch. 10 - Prob. 10.6HWCh. 10 - Prob. 10.7HWCh. 10 - Write a version of the statcheck program in Figure...Ch. 10 - Consider the following invocation of the...Ch. 10 - Prob. 10.10HW
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