#include "apue.h"static void charatatime(char *);intmain(void){	pid_t	pid;	if ((pid = fork()) < 0) {		err_sys("fork error");	} else if (pid == 0) {		charatatime("output from child\n");	} else {		charatatime("output from parent\n");	}	exit(0);}static voidcharatatime(char *str){	char	*ptr;	int		c;	setbuf(stdout, NULL);			/* set unbuffered */	for (ptr = str; (c = *ptr++) != 0; )		putc(c, stdout);}