[lwip-devel] Purpose of memory alignment check

[Boštjan Meglič]

Hello,

In the lwip code src/api/sockets.c, line 117, what is the use of the 
following macro? Why should the name be aligned?
#define IS_SOCK_ADDR_ALIGNED(name)      ((((mem_ptr_t)(name)) % 4) == 0)

On our system (Texas Instruments DSP 5509) the code fails *sometimes* on 
the line 561:
  LWIP_ERROR("lwip_connect: invalid address", 
IS_SOCK_ADDR_LEN_VALID(namelen) &&
             IS_SOCK_ADDR_TYPE_VALID_OR_UNSPEC(name) && 
IS_SOCK_ADDR_ALIGNED(name),
             sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

After I removed the checking for memory alignment, everything works.

My question is, could there be a problem later on if I remove the memory 
alignment check?


Thanks,
Bostjan