1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
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)
|
