This is the same code i made after you suggestion, but in the url parsing code (ngx_parse_unix_domain_url), ngx_cpystrn() is used and it takes '\0' in account.

Changing ngx_cpystrn to not use \0 fixes the problem. Probably substituting it with ngx_memcpy is the way to go.

Another thing to do is "fixing"

u->addrs[0].socklen = sizeof(struct sockaddr_un);

u->addrs[0].socklen = sizeof(saun->sun_family)+len;