Wait

POSIX System call to make the parent process wait for all of its child processes to complete / run some status using the Exit() system call

Demonstration of wait() System Call
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• If any process has more than one child processes, then after calling wait(), parent process has to be in wait state if no child terminates
• If only one child process is terminated, then wait() returns process ID of the terminated child process.
• If more than one child processes are terminated than wait() reap any arbitrarily child and return a process ID of that child process
• When wait() returns they also define **exit status ** via pointer, If pointer is not NULL
• If any process has no child process then wait() returns -1​ immediately.