Re: [PATCH 3/4] lwip: Error handling when calling update_if()

[Joan Lledó]

Hi,

For this case, the callback update_if() doesn't set any error, so there's no 
need to propagate it.

On the other hand, tcpip_callback() doesn't return an errno, it returns an 
internal lwip error code. The only error possible in this call is ERR_MEM, when 
the system runs out of memory. This operation is the result of calling ioctl() 
from the user side, and I don't know what errno return to glibc in this case. I 
chose EAGAIN but I don't know whether is the correct option.