#include<unistd.h>
#include<signal.h>
#include<stdio.h>
#include<stdlib.h>
#include<sys/wait.h>
int pid1,pid2;
int main()
{
int fd[2];
char OutPipe[100],InPipe[100];
pipe(fd);
while((pid1=fork())==-1);
if(pid1==0)
{
lockf(fd[1],1,0);
sprintf(OutPipe,"child 1 process is sending message!");
write(fd[1],OutPipe,50);
sleep(3);
lockf(fd[1],0,0);
exit(0);
}
else
{
while((pid2=fork())==-1);
if(pid2==0)
{
lockf(fd[1],1,0);
sprintf(OutPipe,"child 2 process sending message!");
write(fd[1],OutPipe,50);
sleep(3);
lockf(fd[1],0,0);
exit(0);
}
else
{
wait(0);
read(fd[0],InPipe,50);
printf("%s\n",InPipe);
wait(0);
read(fd[0],InPipe,50);
printf("%s\n",InPipe);
exit(0);
}
}
}