What does the command "mknod temp p" do?

Threads created via pthread_create need to first set up shared memory using shmop before they can share data.

What does the 'open' system call return to the caller?

Effect of a process executing an unlink system call while another process has opened the same file?

Which signal cannot be ignored by a process?

Ignoring the setup cost for each of the System V IPC mechanisms, which one is the most efficient?

It is not possible to set the sticky bit of a file when creating it. Therefore it is necessary to create the directory and then set the sticky bit by executing: mkdir(“/tmp/dir”, 0744); chmod(“/tmp/dir”, 07744). Why?

In a Unix toolchain, which one of these pairs does not fit with the others?

What does this code do: [aLock lockWhenCondition:(int)self beforeDate:[NSDate dateWithTimeIntervalSinceNow:maxTimeInterval]];

Which of the following could the fork() command return to the parent process?

A pipe has been created, and fork() and exec() calls have been completed. What steps must be taken next in order to establish communication from the parent to the child?