Thomas Klausner wiz at
Wed Feb 25 13:24:05 PST 2015

I don't know what the proper way to do this portably, but this is
the diff we currently have in NetBSD's xsrc for xsm to close file
descriptors on exec.

I see that glibc added fopen's "e" flag for 2.7 (in 2007). No idea
about other operating systems, the flag was new to me too :)

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