Matteo Croce
75355f22db
bpf_current_task_under_cgroup() returns 1 if the task is under the
specified cgroup, 0 if not, negative if an error happens.
Differentiate the 1 and -1 cases, and report to userspace when we got
and error.
An error like this is mostly unlikely, the only common one is that the
userspace doesn't populate the map, and the call returns -EAGAIN.
Tested by mocking the return value of bpf_current_task_under_cgroup():
Enumeration completed
enp1s0f0np0: Configuring with /etc/systemd/network/20-test.network.
Sysctl monitor BPF returned error: Link number out of range
Sysctl monitor BPF returned error: No CSI structure available
Sysctl monitor BPF returned error: Invalid exchange
Sysctl monitor BPF returned error: Exchange full
Sysctl monitor BPF returned error: Invalid request code
Sysctl monitor BPF returned error: Unknown error 58
Sysctl monitor BPF returned error: Device not a stream
Sysctl monitor BPF returned error: Timer expired
Sysctl monitor BPF returned error: Machine is not on the network
Sysctl monitor BPF returned error: Object is remote
Sysctl monitor BPF returned error: Advertise error
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