| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| #include <ngx_freebsd_init.h> |
| |
| |
| /* |
| * sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460 and 1176 |
| * or in 6 packets: 5x1460 and 892. Besides although sendfile() allows |
| * to pass the header and the trailer it never sends the header or the trailer |
| * with the part of the file in one packet. So we use TCP_NOPUSH (similar |
| * to Linux's TCP_CORK) to postpone the sending - it not only sends the header |
| * and the first part of the file in one packet but also sends 4K pages |
| * in the full packets. |
| * |
| * Until FreeBSD 4.5 the turning TCP_NOPUSH off does not flush the pending |
| * data that less than MSS so the data can be sent with 5 second delay. |
| * We do not use TCP_NOPUSH on FreeBSD prior to 4.5 although it can be used |
| * for non-keepalive HTTP connections. |
| */ |
| |
| |
| ngx_chain_t *ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in) |
| { |
| int rc, eintr, eagain; |
| char *prev; |
| off_t sent, fprev; |
| ssize_t hsize, fsize, size; |
| struct iovec *iov; |
| struct sf_hdtr hdtr; |
| ngx_err_t err; |
| ngx_array_t header, trailer; |
| ngx_event_t *wev; |
| ngx_hunk_t *file; |
| ngx_chain_t *cl, *tail; |
| |
| wev = c->write; |
| |
| if (!wev->ready) { |
| return in; |
| } |
| |
| #if (HAVE_KQUEUE) |
| |
| if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && wev->kq_eof) { |
| ngx_log_error(NGX_LOG_ERR, c->log, wev->kq_errno, |
| "kevent() reported about closed connection"); |
| |
| wev->error = 1; |
| return NGX_CHAIN_ERROR; |
| } |
| |
| #endif |
| |
| do { |
| cl = in; |
| file = NULL; |
| fsize = 0; |
| hsize = 0; |
| eintr = 0; |
| eagain = 0; |
| |
| ngx_init_array(header, c->pool, 10, sizeof(struct iovec), |
| NGX_CHAIN_ERROR); |
| ngx_init_array(trailer, c->pool, 10, sizeof(struct iovec), |
| NGX_CHAIN_ERROR); |
| |
| /* create the header iovec and coalesce the neighbouring hunks */ |
| |
| prev = NULL; |
| iov = NULL; |
| |
| for (cl = in; cl; cl = cl->next) { |
| if (ngx_hunk_special(cl->hunk)) { |
| continue; |
| } |
| |
| if (!ngx_hunk_in_memory_only(cl->hunk)) { |
| break; |
| } |
| |
| if (prev == cl->hunk->pos) { |
| iov->iov_len += cl->hunk->last - cl->hunk->pos; |
| |
| } else { |
| ngx_test_null(iov, ngx_push_array(&header), NGX_CHAIN_ERROR); |
| iov->iov_base = cl->hunk->pos; |
| iov->iov_len = cl->hunk->last - cl->hunk->pos; |
| } |
| |
| prev = cl->hunk->last; |
| hsize += cl->hunk->last - cl->hunk->pos; |
| } |
| |
| /* get the file hunk */ |
| |
| if (cl && (cl->hunk->type & NGX_HUNK_FILE)) { |
| file = cl->hunk; |
| fsize = (size_t) (file->file_last - file->file_pos); |
| fprev = file->file_last; |
| cl = cl->next; |
| |
| /* coalesce the neighbouring file hunks */ |
| |
| while (cl && (cl->hunk->type & NGX_HUNK_FILE)) { |
| if (file->file->fd != cl->hunk->file->fd |
| || fprev != cl->hunk->file_pos) |
| { |
| break; |
| } |
| |
| fsize += (size_t) (cl->hunk->file_last - cl->hunk->file_pos); |
| fprev = cl->hunk->file_last; |
| cl = cl->next; |
| } |
| } |
| |
| /* create the tailer iovec and coalesce the neighbouring hunks */ |
| |
| prev = NULL; |
| iov = NULL; |
| |
| for ( /* void */; cl; cl = cl->next) { |
| if (ngx_hunk_special(cl->hunk)) { |
| continue; |
| } |
| |
| if (!ngx_hunk_in_memory_only(cl->hunk)) { |
| break; |
| } |
| |
| if (prev == cl->hunk->pos) { |
| iov->iov_len += cl->hunk->last - cl->hunk->pos; |
| |
| } else { |
| ngx_test_null(iov, ngx_push_array(&trailer), NGX_CHAIN_ERROR); |
| iov->iov_base = cl->hunk->pos; |
| iov->iov_len = cl->hunk->last - cl->hunk->pos; |
| } |
| |
| prev = cl->hunk->last; |
| } |
| |
| /* |
| * the tail is the rest of the chain that exceeded |
| * a single sendfile() capability |
| */ |
| |
| tail = cl; |
| |
| if (file) { |
| |
| if (ngx_freebsd_use_tcp_nopush && !c->tcp_nopush) { |
| c->tcp_nopush = 1; |
| |
| ngx_log_debug(c->log, "NOPUSH"); |
| |
| if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { |
| ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno, |
| ngx_tcp_nopush_n " failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| } |
| |
| hdtr.headers = (struct iovec *) header.elts; |
| hdtr.hdr_cnt = header.nelts; |
| hdtr.trailers = (struct iovec *) trailer.elts; |
| hdtr.trl_cnt = trailer.nelts; |
| |
| /* |
| * the "nbytes bug" of the old sendfile() syscall: |
| * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771 |
| */ |
| |
| if (ngx_freebsd_sendfile_nbytes_bug == 0) { |
| hsize = 0; |
| } |
| |
| rc = sendfile(file->file->fd, c->fd, file->file_pos, |
| fsize + hsize, &hdtr, &sent, 0); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| |
| if (err == NGX_EINTR) { |
| eintr = 1; |
| } |
| |
| if (err == NGX_EAGAIN) { |
| eagain = 1; |
| } |
| |
| if (err == NGX_EAGAIN || err == NGX_EINTR) { |
| ngx_log_error(NGX_LOG_INFO, c->log, err, |
| "sendfile() sent only %qd bytes", sent); |
| |
| } else { |
| wev->error = 1; |
| ngx_log_error(NGX_LOG_CRIT, c->log, err, |
| "sendfile() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| } |
| |
| #if (NGX_DEBUG_WRITE_CHAIN) |
| ngx_log_debug(c->log, "sendfile: %d, @%qd %qd:%d" _ |
| rc _ file->file_pos _ sent _ fsize + hsize); |
| #endif |
| |
| } else { |
| rc = writev(c->fd, header.elts, header.nelts); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| if (err == NGX_EAGAIN) { |
| ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN"); |
| |
| } else if (err == NGX_EINTR) { |
| eintr = 1; |
| ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EINTR"); |
| |
| } else { |
| wev->error = 1; |
| ngx_log_error(NGX_LOG_CRIT, c->log, err, "writev() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| } |
| |
| sent = rc > 0 ? rc : 0; |
| |
| #if (NGX_DEBUG_WRITE_CHAIN) |
| ngx_log_debug(c->log, "writev: %qd" _ sent); |
| #endif |
| } |
| |
| c->sent += sent; |
| |
| for (cl = in; cl; cl = cl->next) { |
| |
| if (ngx_hunk_special(cl->hunk)) { |
| continue; |
| } |
| |
| if (sent == 0) { |
| break; |
| } |
| |
| size = ngx_hunk_size(cl->hunk); |
| |
| if (sent >= size) { |
| sent -= size; |
| |
| if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { |
| cl->hunk->pos = cl->hunk->last; |
| } |
| |
| if (cl->hunk->type & NGX_HUNK_FILE) { |
| cl->hunk->file_pos = cl->hunk->file_last; |
| } |
| |
| continue; |
| } |
| |
| if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { |
| cl->hunk->pos += sent; |
| } |
| |
| if (cl->hunk->type & NGX_HUNK_FILE) { |
| cl->hunk->file_pos += sent; |
| } |
| |
| break; |
| } |
| |
| in = cl; |
| |
| if (eagain) { |
| |
| /* |
| * sendfile() can return EAGAIN even if it has sent |
| * a whole file part and successive sendfile() would |
| * return EAGAIN right away and would not send anything |
| */ |
| |
| wev->ready = 0; |
| break; |
| } |
| |
| /* "tail == in" means that a single sendfile() is complete */ |
| |
| } while ((tail && tail == in) || eintr); |
| |
| if (in) { |
| wev->ready = 0; |
| } |
| |
| return in; |
| } |
