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#define UNIX_PATH_MAX   108

struct sockaddr_un {
        sa_family_t     sun_family;     /* AF_UNIX */
        char    sun_path[UNIX_PATH_MAX];        /* pathname */
};

With the current implementation the array sizes would be different, because
sizeof(array[0..108]) is 109 bytes while sizeof(char[108]) = 108.

Even if sa_family_t were "unsigned char", I 'd assume that the structure
members are automatically padded to begin at least at even addresses, so
a padding byte would be required.

Regards,
  Thomas