Operating systems (2024-2025)
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when you type "ls" in the shell, what happens if you don't call fork() before execvp() ?
The fork() function returns:
When the shell has to execute a command "ls -l -h", the call to exec() can be:
when you type "ls" in the shell, what happens if you don't call waitpid() before looping and printing the prompt ?
When you create a pipe p
In the main loop of a shell, you have generally:
In the following code, we want data from A to be redirected to B. What should be the xxx and yyy parameters ? pipe(p); pid = fork(); if (pid == 0) { dup2(xxx); close(p[0]); close(p[1]); execlp("B", "B", NULL); } else { dup2(yyy); close(p[0]); close(p[1]); execlp("A", "A", NULL); }
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