+ my( $class, $filename, $mode ) = @_;
+
+ #from rt/bin/webmux.pl(.in)
+ if ( !$protect_fds && $ENV{'MOD_PERL'} && exists $ENV{'MOD_PERL_API_VERSION'}
+ && $ENV{'MOD_PERL_API_VERSION'} >= 2
+ ) {
+ FS::Trace->log(' protecting fds');
+ # under mod_perl2, STDIN and STDOUT get closed and re-opened,
+ # however they are not on FD 0 and 1. In this case, the next
+ # socket that gets opened will occupy one of these FDs, and make
+ # all system() and open "|-" calls dangerous; for example, the
+ # DBI handle can get this FD, which later system() calls will
+ # close by putting garbage into the socket.
+ $protect_fds = [];
+ push @{$protect_fds}, IO::Handle->new_from_fd(0, "r")
+ if fileno(STDIN) != 0;
+ push @{$protect_fds}, IO::Handle->new_from_fd(1, "w")
+ if fileno(STDOUT) != 1;
+ }