[apparmor] ENOPROTOOPT error when calling aa_getpeercon()

[Sergio Costas Rodriguez]

Hi all,

I'm using aa_getpeercon() to get info about a socket, but in some 
kernels with odd apparmor configurations it returns ENOPROTOOPT. But the 
manpage doesn't list that error in the possible errors of this call. 
Under which circumstances can that error be returned?

Thanks.