David Warde-Farley skrev: >> The odd values might be from the format code in the error message: >> >> PyErr_Format(PyExc_ValueError, >> "%ld requested and %ld written", >> (long) size, (long) n); >> > > Yes, I saw that. My C is rusty, but wouldn't the cast take care of it? > n is of type size_t, which is pretty big, and a cast to long shouldn't > be an issue. And if (hopefully) PyErr_Format is correct... > A long is (usually) 32 bit, even on 64 bit systems. This means that size is casted to an integer between - 2**31 and 2*31 - 1. As 2**31 bytes are 2 GB, the expression "(long) size" will overflow if a write of 2GB or more failed. Thus you get some bogus numbers in the formatted message. There is thus a bug in the call to PyErr_Format, as it only works reliably on 32 bits systems.
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