Skye schrieb:
> Great, thanks for the help (I'm fairly new to Python, didn't know
> about ctypes)
>
> from ctypes import *
> libc = CDLL("libc.so.7")
> size = c_uint(0)
> libc.sysctlbyname("net.inet.ip.stats", None, byref(size), None, 0)
> buf = c_char_p(" " * size.value)
> libc.sysctlbyname("net.inet.ip.stats", buf, byref(size), None, 0)
IIUC, sysctlbyname writes the information you requested into the buffer supplied
as second argument. If this is true, then the above code is incorrect.
c_char_p(src) creates an object that shares the buffer with the Python string
'src';
but Python strings are immutable and you must not write ctypes code that
modifies them.
Instead, you should code:
from ctypes import *
libc = CDLL("libc.so.7")
size = c_uint(0)
libc.sysctlbyname("net.inet.ip.stats", None, byref(size), None, 0)
buf = create_string_buffer(size.value)
libc.sysctlbyname("net.inet.ip.stats", buf, byref(size), None, 0)
Thomas
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