Process creation (fork and exec) in Operating Systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new process using fork.

Operating Systems

pid = [1]()

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Aspawn

Bexec

Cfork

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Using exec instead of fork to create a process.

Confusing spawn or clone with fork.

The fork() system call creates a new process by duplicating the calling process.

2fill in blank

medium

Complete the code to replace the current process image with a new program using exec.

Operating Systems

exec[1]("/bin/ls", "ls", "-l", NULL);

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Afork

Bexecvp

Cexecv

Dexecl

Attempts:

3 left

💡 Hint

Common Mistakes

Using fork instead of exec to replace the process image.

Confusing execv (which takes an array) with execl (which takes a list).

The execl() function replaces the current process image with a new program, taking the program path and arguments as a list.

3fill in blank

hard

Fix the error in the code to correctly create a child process and run a new program.

Operating Systems

pid = fork();
if (pid == 0) {
    [1]("/bin/echo", "echo", "Hello", NULL);
} else {
    wait(NULL);
}

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Aexecl

Bexecvp

Cexit

Dfork

Attempts:

3 left

💡 Hint

Common Mistakes

Calling fork again inside the child process.

Using exit instead of exec to run the new program.

Inside the child process (pid == 0), execl() replaces the process image with the new program.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps process IDs to their status if the status is 'running'.

Operating Systems

{pid: status for pid, status in processes.items() if status [1] [2]

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A==

B"running"

C!=

D"stopped"

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' causing wrong filtering.

Using the wrong status string like 'stopped'.

The comprehension filters processes where the status is exactly "running" using the equality operator ==.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase process names to their IDs if the ID is greater than 1000.

Operating Systems

{ [1]: [2] for [3], name in process_list if [3] > 1000 }

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Aname.upper()

Bname

Cpid

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'id' instead of 'pid' as the loop variable.

Using 'name' instead of 'name.upper()' for the key.

The comprehension maps the uppercase process name (name.upper()) to the process ID (pid) for IDs greater than 1000.