syscall or gettid system function from Cython

I need to call gettid from Cython. Accordingly to its man page, I should use the syscall function. I’m running Linux.

I can easily get the gettid function number:

cdef extern from "sys/syscall.h":
    cdef int __NR_gettid

But I cannot find how to import, or better cimport, syscall.

Any ideas?

Thanks.

Answer

You can look up in the cython’s github repository, how those includes are done best, for example: stdio.h.

Applying this leads to:

%%cython
cdef extern from "<sys/syscall.h>" nogil:
    int __NR_gettid
    long syscall(long number, ...)

def gettid():
    return syscall(__NR_gettid)

And now gettid() yields:

>>> gettid()
7231