[Madwifi-devel] Problems with byte allignment

[kaleda <gad...@so...>]

There are some byte unaligned structures.
E.g.
struct ieee80211req_mlme 
or struct ieee80211req_del_key

In i386 everything is OK, but on some architectures (xscale) compiler
alignes struct members ant the struct gets bigger.

iwpriv output:
- on i386:
delkey           (8BE4) : set   7 byte  & get   0      
setmlme          (8BE6) : set  10 byte  & get   0  

- on xscale:
delkey           (8BE4) : set   8 byte  & get   0      
setmlme          (8BE6) : set  12 byte  & get   0      



It would be better to add some pad bytes
E.g.:
struct ieee80211req_mlme {
  u_int8_t	im_op;	/* operation to perform */
  u_int8_t      pad[3];   // for alignment
  u_int16_t	im_reason;	/* 802.11 reason code */
  u_int8_t	im_macaddr[IEEE80211_ADDR_LEN];
};
or use __attribute__((packed))

So, when you call ioctl via iwpriv, parameters line would be more
predictible.


--
kaleda