NGX_TRAILERS       52 os/unix/ngx_darwin_sendfile_chain.c     struct iovec    *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
NGX_TRAILERS       86 os/unix/ngx_darwin_sendfile_chain.c     trailer.nalloc = NGX_TRAILERS;
NGX_TRAILERS       54 os/unix/ngx_freebsd_sendfile_chain.c     struct iovec    *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
NGX_TRAILERS       90 os/unix/ngx_freebsd_sendfile_chain.c     trailer.nalloc = NGX_TRAILERS;