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 esp-extra-scripts

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ffi_example.py

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import ffi

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", "piip")

# And one variable

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

print("time:", time)

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

print()

perror("ffi before error")

open("somethingnonexistent__", 0)

print("errno object:", errno)

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

perror("ffi after error")

print()

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")

print("callback:", cmp_c)

s = bytearray(b"foobar")

print("org string:", s)

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

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