Simple Chat application

[mukundyk]

Hello everyone.
i am trying to make a simple chat application using fifos. This is what i tried:

PROCESS 1:

#include <stdio.h>
#include <fcntl.h>
#include <string.h>

int main(void)
{
	int fd1, fd2;
	char buf[100];

	if( ((fd1 = open("fifo1", O_WRONLY)) < 0) || ((fd2 = open("fifo2", O_RDONLY)) < 0) ) {
		perror("Error");
    	} else {
		printf("\nBegin chat");		

		for(;;) {
			scanf("%s", buf);			
			write(fd1, buf, strlen(buf) + 1);			

			/* read chat reply  */				
			for(;;) {
				if( read(fd2, buf, 1) <= 0 ) 
				break;
				printf("%c", buf[0]);
			}		
		
		}
	}
	
        close(fd1);
        close(fd2);
		
        return 0;				
}

PROCESS 2:

#include <stdio.h>
#include <fcntl.h>
#include <string.h>

int main(void)
{
	int fd1, fd2;
	char buf[100];

	if( ((fd1 = open("fifo1", O_RDONLY)) < 0) || ((fd2 = open("fifo2", O_WRONLY)) < 0) ) {
		perror("Error");
    	} else {
		printf("\nBegin chat");		

		for(;;) {
			scanf("%s", buf);			
			write(fd2, buf, strlen(buf) + 1);			

			/* read chat reply from client */				
			for(;;) {
				if( read(fd1, buf, 1) <= 0 ) 
				break;
				printf("%c", buf[0]);
			}		
		
		}
	}
	
        close(fd1);
        close(fd2);
		
        return 0;				
}

[mukundyk]

But it is not working. im not able to get the changing data in either of the terminals.
im running these processes from different terminals. But it did not work

Can anyone please explain what changes i need to make?
Thanks in advance.

[chaosless]

have a look at write and talk commands - there are several things that do this between terminals - if that's your objective.

or is this just a programming exercise for you?

[mukundyk]

Thanks for the reply. Yes it is just as a practice. Can you please tell me where im going wrong?

[srinathduraisamy]

You have to create the fifo first, use mknod to create the fifo.

Hope this helps.

[mukundyk]

Yes i did..But i used mkfifo.Then i added "w" permission for all.The problem is, im not able get simultaneous replies in the two terminals..ANy idea what the problem is?
Thanks.