Thomas Heller added the comment:

The cross-platform function is ctypes.util.find_library, which is
currently not very useful on Windows.

This patch changes it so that, on Windows, find_library("c") or
find_library("m") finds the MS C runtime lib which exposes functions the
are typically in libc and libm.

The runtime lib in Windows is special anyway; the 'open' function, for
example, is exported as '_open'.

However, the easiest way on Linux (don't know about other platforms) to
load the C runtime lib is to use ctypes.CDLL(None), which translates to
dlopen(NULL) in C.  Linux exposes all symbols from all loaded libraries
to the returned handle.

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<http://bugs.python.org/issue1793>
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