C programming exercises

moreece · 08-05-2010, 07:06 AM

Hi people am new to c programming in linux and i came across a couple of questions for a program.if u could please help me do it i'd appreaciate it.

•Write a program that requires the user to input the name of a file as an argument. If the user fails to include one argument it should make use of a thread that handles a signal. The signal handler should tells the user “Incorrect number of arguments and then calls the terminate signal on the process.

•If the numbers of arguments are correct then the program should allocate memory space to the file (5MB) and create a child process that requests the user for a character that it should send to the parent. The child should keep request for data until the user keys in the character O. During each request it should pause for 10 seconds, send the character to the parent and then requesting again for another character.

•The parent should get the character from the child. Do not make the parent wait for the child to finish requesting for data. Make use of pipes to facilitate communication between the parent and the child.

•A second child should be created to read and display data from the file. Make use of any appropriate Inter Process Communication technique to ensure that the second child and the parent do not access the file simultaneously (Mutual exclusion).

Sergei Steshenko · 08-05-2010, 07:12 AM

Quote:

Originally Posted by moreece

Hi people am new to c programming in linux and i came across a couple of questions for a program.if u could please help me do it i'd appreaciate it.

•Write a program that requires the user to input the name of a file as an argument. If the user fails to include one argument it should make use of a thread that handles a signal. The signal handler should tells the user “Incorrect number of arguments and then calls the terminate signal on the process.

•If the numbers of arguments are correct then the program should allocate memory space to the file (5MB) and create a child process that requests the user for a character that it should send to the parent. The child should keep request for data until the user keys in the character O. During each request it should pause for 10 seconds, send the character to the parent and then requesting again for another character.

•The parent should get the character from the child. Do not make the parent wait for the child to finish requesting for data. Make use of pipes to facilitate communication between the parent and the child.

•A second child should be created to read and display data from the file. Make use of any appropriate Inter Process Communication technique that we have discussed in class to ensure that the second child and the parent do not access the file simultaneously (Mutual exclusion).

http://www.eng.cam.ac.uk/help/tpl/unix/fork.html

moreece · 08-05-2010, 07:57 AM

I was hoping for something more specific.

johnsfine · 08-05-2010, 08:04 AM

Quote:

Originally Posted by moreece

Hi people am new to c programming in linux and i came across a couple of questions for a program.if u could please help me do it i'd appreaciate it.

That does a good job of making the directly pasted in homework assignment sound like it is not a homework assignment. But the point of the forum rule "don't expect us to do your homework" still applies even if this were self study "homework" you selected on your own.

Do not post just the text of a homework question and ask someone to do (or even start) the whole task for you.

Make an attempt to do it yourself.

Ask specific questions about specific parts of the task that you find difficult.

Sergei Steshenko · 08-05-2010, 08:06 AM

Quote:

Originally Posted by moreece

I was hoping for something more specific.

Oh, I was hoping to see some code of yours.

dugan · 08-05-2010, 08:18 AM

Quote:

Originally Posted by moreece

I was hoping for something more specific.

Then ask more specific questions. For example, you could have asked one of the following:

please recommend some tutorials on using pipes for IPC
here's a function I wrote, here's what it should do, here's what it currently does instead

(No, we're not going to write the code for you, if that's what you mean by "help" and "something more specific.")