Eryk Sun <eryk...@gmail.com> added the comment:
nt.execv[e] wraps calling the C runtime _wexecv[e] function. The other os.exec*
functions are in turn based on these calls. As to spawn, for Windows _P_OVERLAY
just means to exit the current process. The source code is published, so you
can see how simple the implementation is in ucrt\exec\spawnv.cpp:
if (mode == _P_OVERLAY)
{
// Destroy ourselves:
_exit(0);
}
If I recall correctly, in the early 80s, Microsoft's C runtime was used for
both MS-DOS and Xenix (Unix) development. One assumes that the overlay option
was actually useful in Xenix.
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<https://bugs.python.org/issue9148>
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