Choose the answer that corrects the following code. FILE * file1; : if ((file1 = open("/valid_dir/existing_file", O_RDONLY, 0666)) == ERROR) { /* /valid_dir/existing_file is guaranteed to exist */ :

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?

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

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

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

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?

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

Which signal cannot be ignored by a process?

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

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

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