STINNER Victor added the comment: I have no opinon on close() vs setting CLOEXEC flag, but you should use _Py_set_inheritable(fd, 0, NULL). _Py_set_inheritable() is able to set the CLOEXEC flag in a single syscall, instead of 2 syscalls. _close_fds_by_brute_force() is already very slow when the maximum file descriptor is large: http://legacy.python.org/dev/peps/pep-0446/#closing-all-open-file-descriptors
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