Answer: wait() system call
A system call is
a low-level function that is used to communicate with the operating system kernel.
wait() system call is used
in processes that have a parent-child relationship. It makes a parent process
stop its execution till the termination of the child process.
When the system call
completes, it returns the following.
Process ID: The process ID of the child process that is
terminated, which has the object type pid_t.
Error value: If there is any error during system call execution,
it will return -1, which can be used for error handling.
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