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Asked: 2026-05-11T01:06:40+00:00

i have a c function which returns a long double . i’d like to

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i have a c function which returns a long double. i’d like to call this function from python using ctypes, and it mostly works. setting so.func.restype = c_longdouble does the trick — except that python’s float type is a c_double so if the returned value is larger than a double, but well within the bounds of a long double, python still gets inf as the return value. i’m on a 64 bit processor and sizeof(long double) is 16.

any ideas on getting around this (e.g. using the decimal class or numpy) without modifying the c code?

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  1. I’m not sure you can do it without modifying the C code. ctypes seems to have really bad support for long doubles – you can’t manipulate them like numbers at all, all you can do is convert them back and forth between the native float Python type.

    You can’t even use a byte array as the return value instead of a c_longdouble, because of the ABI – floating-point values aren’t returned in the %eax register or on the stack like normal return values, they’re passed through the hardware-specific floating-point registers.

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