operating system services times(returns -tuple of floating-point numbers indicating accumulated times in seconds on unixthe tuple contains the user timesystem timechildren' user timechildren' system timeand elapsed real time in that order on windowsthe tuple contains the user timesystem timeand zeros for the other three values wait([pid]waits for completion of child process and returns tuple containing its process id and exit status the exit status is -bit number whose low byte is the signal number that killed the process and whose high byte is the exit status (if the signal number is zerothe high bit of the low byte is set if core file was produced pidif givenspecifies the process to wait for if it' omittedwait(returns when any child process exits (unixwaitpid(pidoptionswaits for change in the state of child process given by process id pid and returns tuple containing its process id and exit status indicationencoded as for wait(options should be for normal operation or wnohang to avoid hanging if no child process status is available immediately this function can also be used to gather information about child processes that have only stopped executing for some reason setting options to wcontinued gathers information from child when it resumes operation after being stopped via job control setting options to wuntraced gathers information from child that has been stoppedbut from which no status information has been reported yet wait ([options]the same as waitpid(except that the function waits for change in any child process returns -tuple (pidstatusrusage)where pid is the child process idstatus is the exit status codeand rusage contains resource usage information as returned by resource getrusage(the options parameter has the same meaning as for waitpid(wait (pidoptionsthe same as waitpid(except that the return result is the same tuple as returned by wait (the following functions take process status code as returned by waitpid()wait ()or wait (and are used to examine the state of the process (unixwcoredump(statusreturns true if the process dumped core wifexited(statusreturns true if the process exited using the exit(system call wexitstatus(statusif wifexited(statusis truethe integer parameter to the exit(system call is returned otherwisethe return value is meaningless lib fl ff