are not needed in the pthreads version. The /dev/zero file, if opened, should have the close-on-exec flag so that it won't get inherited by child processes. Modified files: _unixos.h, primpl.h, prseg.c, unix.c git-svn-id: svn://10.0.0.236/trunk@70877 18797224-902f-48f8-a5cc-f745e15eee43