Notes

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sched.h>
#include <sys/time.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
//fd2 is the child process and fd1 is the parent process
int fd1[2],fd2[2], nbytes;
pid_t pid;
char child_msg[] ="Hello parent process!nn";
char parent_msg[]="hi child process";
char buffer1[80];
char buffer2[80];
pipe(fd1);
pipe(fd2);
if((pid = fork()) == -1)
{
perror("fork");
exit(1);
}
if(pid == 0)
{


/* child process i.e fd2 has to write so its read end is closed */
close(fd2[0]);


/* and its write end is opened */
write(fd2[1], parent_msg, (strlen(parent_msg)+1));


/* parent process has to read so we close its write side */
close(fd1[1]);


/* we open parent process read */
nbytes = read(fd1[0], buffer1, sizeof(buffer1));
printf("Message recieved from child process is: %s", buffer1);

}


else
{

close(fd2[1]);


nbytes = read(fd2[0], buffer2, sizeof(buffer2));
printf("n Message recieved from parent process is: %s", buffer2);


close(fd1[0]);


write(fd1[1], child_msg, (strlen(child_msg)+1));
}

return(0);
}