Process Execution and Termination Between Parent and Child(orphan child)

When ever we are running two process together using fork() in our main program , and if parent process finishes before child process , Parent process is terminated by shell and Child is adopted by INIT process whose PID is 1 so child PPID also becomes 1 after termination of parent process and Child become ORPHAN. IT becomes shell hang/halt state.
To Overcome this problem we use WAIT() system call which will pause the execution of parent process untill child process finishes execution.
The argument of WAIT() is ptr to the location where the exit code of child process is stored. When the exit code of child process becomes visible to the parent process. Parent comes out of pause state and Execute termination section of child process. After that shell executes Termination section of process.
This can be checked by using MACRO
wait()--------for pause.----------Return PID of child process
WIFEXITED(stat_val)------- Non zero if child terminates normally.
WEXITSTATUS(stat_val)-------- will return child exit code if child terminates normally by using EXIT call .
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