waitdemo2.c

#include <stdio.h>
#include <stdlib.h>
#define DELAY 3
main()
{
	int newpid;
	void child_code(), parent_code();

	printf("before : mypid is %d \n", getpid());

	if( (newpid = fork()) == -1 )
		perror("fork");
	else if(newpid == 0)
		child_code(DELAY);
	else
		parent_code(newpid);

}

void child_code(int delay)
{
	printf("child %d here. will sleep for %d seconds \n",getpid(),delay);
	sleep(delay);
	printf(" child done. about to exit\n");
	exit(17);
}

void parent_code(int childpid)
{
	int wait_rv;
	int child_status;
	int high_8, low_7, bit_7;

	wait_rv = wait(&child_status);
	printf(" done waiting for %d. Wait returned : %d \n", childpid,wait_rv);

	high_8 = child_status >> 8;
     low_7 = child_status & 0x7F;
	 bit_7 = child_status & 0x80;

	 printf("status : exit = %d, sig = %d, core = %d \n", high_8,low_7,bit_7);
}