One of the reasons posix_spawn is rarely used with subprocess functions is that it doesn't support close_fds=True (which is the default value).
Previously, it was deemed infeasible to support this (#79718 (comment)), but since then, posix_spawn_file_actions_addclosefrom_np() has become available on many systems (I know about Solaris, Linux and FreeBSD), which should make it pretty simple to support it.
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Links to previous discussion of this feature:These two are related:
#79718 was the original issue for using os.posix_spawn() in subprocess.
#86904 proposed changing close_fds to default to False, so posix_spawn() could be used more often
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