Programming

Hello guys!

I had seen some posts at this forum talking about my problem, but maybe my scenario is a little different, and I want other solutions.

I saw users of this forums saying that the way to shared sockets is using UNIX Sockets, but this is the only way in my scenario?

My Scenario:

I have a process that is the server. Server accepts clients (sockets) and then call to fork. If two clients connects to my server, parent process will have two childs, and now is my problem, one of this child need to send a message to the another child.

First, I thinked that I could save fd socket in share memory, and then using this fd in another child I'll be able to send messages to another client, but doesn't works...

Any ideas?? Thanks!

PD: Sorry for my bad english

Hi,

you can use shared_memory IPC to share the sockets(any data) between the two processes via a unique key. Otherwise you can instead create threads when you serve a new request. Then you save the overhead of forking a new process.

Thanks,
Gaurav.

Hi!!

Yes, I tried this, but not worked for me. How Can I shared a socket?
I tried to share value of " fd_client = accept(sock,0,0); ". I saved value of fd_client in a shared memory, but then when I read this value, and write into it, really I'm writting in the childs socket, and not in the value that I saved (another child).

Can you give me an example to share a socket with IPC? Thanks!

Hello,

Can you provide the code that you tried but it failed. ?

Thanks,
Gaurav.

Hi!!
No, because I did a lot of changes these days... for example, now I'm trying to do with pipes, but I can describe.

I create a struct, and then I shared with shared memory, struct was this:

Code:

typedef struct _clients{
        char login[7];
        int fd;
        int stat;
}clients[3];

And struct and shared memory works good (tested).

My server is listening connections, when connection arrives then forks and the client go to child. Before fork, I saved value of "fd_client = accept(sock,0,0);" into struct client[0]->fd=fd_client;

Then, when another children needs to write in the socket of another child, I search in the struct the fd of the another child, because I know he's login. Then I call write(fd,"test",4);

Problem? word "test" is send to the actual child, and I can see in his screen the word "test", when I need to write this "test" in the screen of the other child.

Now, seeing this, maybe I need to save value of "sock" instead "fd_client"??

Thanks