come to think of it, Perl's open is not entirely appropriate for redirecting. It's better to use low-level dup2, otherwise there are some bad interactions when standard streams are already closed (which must be the case for a server). 
    if ( $pid == 0 ) {
        close $input_to_child;
        close $output_from_child;

        if ( fileno $child_stdout != POSIX::STDOUT_FILENO ) {
            POSIX::dup2( fileno $child_stdout, POSIX::STDOUT_FILENO );
            close $child_stdout;
        }
        if ( fileno $child_stdin != POSIX::STDIN_FILENO ) {
            POSIX::dup2( fileno $child_stdin, POSIX::STDIN_FILENO );
            close $child_stdin;
        }
        exec {'perl'} 'perl', 'client.pl';
    }

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In reply to Re^2: How a web server sending data to a CGI perl script ? by Anonymous Monk
in thread How a web server sending data to a CGI perl script ? by exilepanda

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