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?

Recently your office's UNIX tool-chain was updated. Now, code that previously used to build and run still builds without any warnings or errors but displays load-time errors due to symbols not found in shlibs. You have ensured that all necessary shared libraries are present in the path 'pointed to' by the appropriate environment variable. Which is true?

What does this code do: BOOL sharedLockSuccess = NO; NSLock *aMutex; : sharedLockSuccess = [aMutex lockWhenCondition:1 beforeDate:[NSDate dateWithTimeIntervalSinceNow:(NSTimeInterval)3600]]; :

Which system call can be used to send a message via a connected socket?

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.

What does the command 'mknod temp p' do?

Which utility is used to search out regular expressions in the input?

If a process has locked a System V Semaphore and receives a SIGKILL signal, which one is true?