Hello, I want to create an extension module that provides an interface to a couple of C functions that take arguments of type struct iovec, struct stat, struct flock, etc (the FUSE library, in case it matters).
Now the problem is that these structures contain attributes of type fsid_t, off_t, dev_t etc. Since I am receiving the values for these attributes from the Python caller, I have to convert them to the correct type using PyArg_ParseTuple. However, since the structs are defined in a system-dependent header file, when writing the code I do not know if on the target system, e.g. off_t will be of type long, long long or unsigned long, so I don't know which format string to pass to PyArg_ParseTuple. Are there any best practices for handling this kind of situation? I'm at a loss right now. The only thing that comes to my mind is to, e.g., to compare sizeof(off_t) to sizeof(long) and sizeof(long long) and thereby determine the correct bit length at runtime. But this does not help me to figure out if it is signed or unsigned, or (in case of other attributes than off_t) if it is an integer at all. Best, -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C -- http://mail.python.org/mailman/listinfo/python-list
