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ffi_callback.py

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try:

import ffi

except ImportError:

print("SKIP")

raise SystemExit

def ffi_open(names):

err = None

for n in names:

try:

mod = ffi.open(n)

return mod

except OSError as e:

err = e

raise err

libc = ffi_open(("libc.so", "libc.so.0", "libc.so.6", "libc.dylib"))

qsort = libc.func("v", "qsort", "piip")

def cmp(pa, pb):

a = ffi.as_bytearray(pa, 1)

b = ffi.as_bytearray(pb, 1)

# print("cmp:", a, b)

return a[0] - b[0]

cmp_c = ffi.callback("i", cmp, "pp")

s = bytearray(b"foobar")

print("org string:", s)

qsort(s, len(s), 1, cmp_c)

print("qsort'ed:", s)