+ if ( !$protect_fd && $ENV{'MOD_PERL'} && exists $ENV{'MOD_PERL_API_VERSION'}
+ && $ENV{'MOD_PERL_API_VERSION'} >= 2 && fileno(STDOUT) != 1
+ ) {
+ # under mod_perl2, STDOUT gets closed and re-opened, however new STDOUT
+ # is not on FD #1. In this case next IO operation will occupy this FD
+ # and make all system() and open "|-" dangerouse, for example DBI
+ # can get this FD for DB connection and system() call will close
+ # by putting grabage into the socket
+ open( $protect_fd, '>', '/dev/null' )
+ or die "Couldn't open /dev/null: $!";
+ unless ( fileno($protect_fd) == 1 ) {
+ warn "We opened /dev/null to protect FD #1, but descriptor #1 is already occupied";
+ }
+ }
+