#include "apue.h"int		glob = 6;		/* external variable in initialized data */char	buf[] = "a write to stdout\n";intmain(void){	int		var;		/* automatic variable on the stack */	pid_t	pid;	var = 88;	if (write(STDOUT_FILENO, buf, sizeof(buf)-1) != sizeof(buf)-1)		err_sys("write error");	printf("before fork\n");	/* we don't flush stdout */	if ((pid = fork()) < 0) {		err_sys("fork error");	} else if (pid == 0) {		/* child */		glob++;					/* modify variables */		var++;	} else {		sleep(2);				/* parent */	}	printf("pid = %d, glob = %d, var = %d\n", getpid(), glob, var);	exit(0);}