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arigo@catsnake:/tmp/x$ python x_build.py
generating ./StrategyBasic.c
running build_ext
building 'StrategyBasic' extension
gcc -pthread -fno-strict-aliasing -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -DNDEBUG -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fPIC -I/usr/include/python2.7 -c StrategyBasic.c -o ./StrategyBasic.o
gcc -pthread -shared -Wl,-O1,--sort-common,--as-needed,-z,relro ./StrategyBasic.o -L/usr/lib -lpython2.7 -lpython2.7 -o ./libStrategyBasic.so

arigo@catsnake:/tmp/x$ gcc main.c -L. -lStrategyBasic

arigo@catsnake:/tmp/x$ LD_LIBRARY_PATH=. a.out
init() called!

algoserver.h

struct _AlgoServer {
  void (*init)(void);
  void (*destroy)(void);
  void (*getAccountInfo)(char*);
};

extern struct _AlgoServer AlgoServer;

extern void runStrategyBasic(struct _AlgoServer *);

main.c

#include <stdio.h>
#include "algoserver.h"

void init() {
    printf("init() called!\n");
}

void destroy() {

}

void getAccountInfo(char *result) {
  result = "SUCCESSFUL ACCOUNT INFO RETURNED\0";
}

struct _AlgoServer AlgoServer = {
  .init = init,
  .destroy = destroy,
  .getAccountInfo = getAccountInfo
};

extern void runStrategyBasic(struct _AlgoServer *);


int main(void)
{
    runStrategyBasic(&AlgoServer);
}

x_build.py

import cffi
ffibuilder = cffi.FFI()

with open('algoserver.h') as f:
    ffibuilder.embedding_api(f.read())

ffibuilder.set_source("StrategyBasic", r'''
    #include "algoserver.h"
''')

ffibuilder.embedding_init_code("""
    from StrategyBasic import ffi

    @ffi.def_extern()
    def runStrategyBasic(server):
        server.init()
""")

ffibuilder.compile(target="libStrategyBasic.*", verbose=True)