The operational constant of the flock() function that opens the file with an exclusive lock for writing is the ____.
A) LOCK_EX
B) LOCK_SH
C) LOCK_NB
D) LOCK_UN

Question

Quizplus · Accepted Answer

The flock() function with the LOCK_EX constant opens the file with an exclusive lock for writing, meaning no other process can access the file for writing while the lock is in place. The other options (LOCK_SH, LOCK_NB, LOCK_UN) are for different types of locks or options for releasing locks.

The Operational Constant of the Flock() Function That Opens the File