The syntax is
pid_t waitpid(pid_t pid, int *statusPtr, int options);
1.where pid is the process of the child it should wait.
2.statusPtr is a pointer to the location where status information for the terminating process is to be stored.
3.specifies optional actions for the waitpid function. Either of the following option flags may be specified, or they can be combined with a bitwise inclusive OR operator:
WNOHANG WUNTRACED WCONTINUED
If successful, waitpid returns the process ID of the terminated process whose status was reported. If unsuccessful, a -1 is returned.
benifits over wait
1.Waitpid can used when you have more than one child for the process and you want to wait for particular child to get its execution done before parent resumes
2.waitpid supports job control
3.it supports non blocking of the parent process