You should try 

open STDIN, "<&", $c;

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which does a dup2 to copy the handle $c to the STDIN. This way filehandle 0 of perl (the real stdin in the eyes of unix, not only the STDIN glob of perl) will be associated to perl. Stdin normally has the FD_CLOEXEC flag unset, so it will be passed to the child process.

If you don't have to use stdin only pass a filehandle, you can do this: Clear the FD_CLOEXEC flag like 

fcntl $c, F_GETFD, 0; fcntl $c, F_SETFD, $x&~FD_CLOEXEC;

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so that it will be passed to the child. Than somehow tell the number fileno($c) to the child process and the child can read from that filehandle.

Update: Does this post make sense? The whole point is, you should write open STDIN, "<&", $c; instead of *STDIN = $c; because the latter affects only perl's idea of stdin.

In reply to Re: Problem with passing my script's STDIN to child by ambrus
in thread Problem with passing my script's STDIN to child by suaveant

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