On Wed, Apr 22, 2009 at 3:38 PM, Rohit Sharma <imreckless@xxxxxxxxx> wrote:
> Arun, i suggest that if you are using this for IPC then , better use pipes.
>
> And if you really want to use fd in another application then
> pass the file descriptor to exec after doing a fork.
>
> something like this.
>
> in application_1
>
> ret = fork();
>
> if(ret == 0){
> sprintf(buff, "%d", fd_1);
> (void)exec("application_2","application_2", buff, (char*)0);
> }
>
> .......
> .........
>
> in application_2
>
> int fd_1;
> sscanf(argv[1],"%d", &fd_1);
>
> read(fd_1, buff, BUFFSIZE);
>
> ....
> .....
>
> I hope that helps.
Decided to back and refresh my memory. I was not thinking of passing
a FD via a pipe. I was thinking of doing it through sendmsg().
I don't think I ever did that in Linux, so it may or may not work with
a linux kernel.
See http://archives.neohapsis.com/archives/postfix/2000-09/1476.html
for a write-up of how it worked in at least some environments. I
don't even remember what flavor of Unix I was using when I did the
sendmsg() trick to pass a FD.
Greg
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