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I was curious whether the fact that shm_open() essentially calls open() is true, and in fact it is, at least with eglibc on Linux:

Cute, it doesn't even try to use the race-free O_CLOEXEC variant, which was introduced "only" 6 years ago. http://www.eglibc.org/cgi-bin/viewvc.cgi/trunk/libc/sysdeps/... is the trunk version. Seems glibc trunk is the same

“It” (that is POSIX fall-back) don't try it because O_CLOEXEC is not POSIX. And you don't know how to look properly

O_CLOEXEC was recently added to POSIX.

If you want a C library that takes that sort of thing seriously you should be using Musl[1] as they do care about things like that.