Python Ctypes Calling Reboot() From Libc On Linux

I'm trying to call the reboot function from libc in Python via ctypes and I just can not get it to work. I've been referencing the man 2 reboot page (http://linux.die.net/man/2/re

Solution 1:

Try:

>>>libc = CDLL('libc.so.6', use_errno=True)

That should allow get_errno() to work.

[update]

Also, the last argument is a void *. If this is a 64-bit system, then the integer 0 is not a valid repesentation for NULL. I would try None or maybe c_void_p(None). (Not sure how that could matter in this context, though.)

[update 2]

Apparently reboot(0x1234567) does the trick (see comments).

Solution 2:

The reboot() in libc is a wrapper around the syscall, which only takes the cmd argument. So try:

libc.reboot(0x1234567)

Note that you should normally be initiating a reboot by sending SIGINT to PID 1 - telling the kernel to reboot will not give any system daemons the chance to shut down cleanly, and won't even sync the filesystem cache to disk.