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micropython/examples/unix/ffi_example.py at master · itschina/micropython · GitHub

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import ffi

import uctypes

libc = ffi.open("libc.so.6")

print("libc:", libc)

print()

# Declare few functions

perror = libc.func("v", "perror", "s")

time = libc.func("i", "time", "p")

open = libc.func("i", "open", "si")

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

# And one variable

errno = libc.var("i", "errno")

print("time:", time)

print("UNIX time is:", time(None))

print()

perror("perror before error")

open("somethingnonexistent__", 0)

print("errno object:", errno)

print("errno value:", errno.get())

perror("perror after error")

print()

def cmp(pa, pb):

a = uctypes.bytearray_at(pa, 1)

b = uctypes.bytearray_at(pb, 1)

print("cmp:", a, b)

return a[0] - b[0]

cmp_cb = ffi.callback("i", cmp, "PP")

print("callback:", cmp_cb)

s = bytearray(b"foobar")

print("org string:", s)

qsort(s, len(s), 1, cmp_cb)

print("qsort'ed string:", s)

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