Quoting Shao Zhang ([EMAIL PROTECTED]):
>
> while (1) {
> if ((NewHandle = accept(CGIHandle, (struct sockaddr
> *)&CGI_addr, \
> &sin_size)) == -1) {
> perror("cannot accept");
> continue;
> }
>
> if (!fork() ) { /* this is the child */
> /* process the cgi request; */
>
> close(NewHandle);
> exit(0);
> }
>
> close(NewHandle); /* parent does not need this */
> }
>
> My problem is I have to close the NewHandle for the parent process.
> But once I did this, when another request comes
> in, accept will allocate a new file descriptor with the same number it
> allocated before, since it is thinking the last one is closed.
> If the last child process still has not finished, then I will have two
> child process with the same descriptor, and then the child
> will return the request to the wrong location.
You've answered this yourself. "a new file descriptor with the same number".
So you have, for example, file descriptors p(arent)-n(umber) which becomes
p-n=c(hild)1-n at the fork. p-n is then closed, leaving c1-n. Now the second
request leads to p-n again, which becomes p-n=c2-n, and p-n gets closed.
At any one time, there exist: p-n=cc-n .. c2-n c1-n and they're all
unique except the first pair. n is the same in all cases, but they're in
different processes, and so distinguishable.
Cheers,
--
Email: [EMAIL PROTECTED] Tel: +44 1908 653 739 Fax: +44 1908 655 151
Snail: David Wright, Earth Science Dept., Milton Keynes, England, MK7 6AA
Disclaimer: These addresses are only for reaching me, and do not signify
official stationery. Views expressed here are either my own or plagiarised.
