| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| |
| |
| /* |
| * Although FreeBSD sendfile() allows to pass a header and a trailer, |
| * it cannot send a header with a part of the file in one packet until |
| * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile() |
| * may send the partially filled packets, i.e. the 8 file pages may be sent |
| * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet, |
| * and then again the 11 full 1460-bytes packets. |
| * |
| * Therefore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK) |
| * to postpone the sending - it not only sends a header and the first part of |
| * the file in one packet, but also sends the file pages in the full packets. |
| * |
| * But until FreeBSD 4.5 turning TCP_NOPUSH off does not flush a pending |
| * data that less than MSS, so that data may be sent with 5 second delay. |
| * So 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, off_t limit) |
| { |
| int rc, flags; |
| off_t send, prev_send, sent; |
| size_t file_size; |
| ssize_t n; |
| ngx_uint_t eintr, eagain; |
| ngx_err_t err; |
| ngx_buf_t *file; |
| ngx_event_t *wev; |
| ngx_chain_t *cl; |
| ngx_iovec_t header, trailer; |
| struct sf_hdtr hdtr; |
| struct iovec headers[NGX_IOVS_PREALLOCATE]; |
| struct iovec trailers[NGX_IOVS_PREALLOCATE]; |
| #if (NGX_HAVE_AIO_SENDFILE) |
| ngx_uint_t ebusy; |
| ngx_event_aio_t *aio; |
| #endif |
| |
| wev = c->write; |
| |
| if (!wev->ready) { |
| return in; |
| } |
| |
| #if (NGX_HAVE_KQUEUE) |
| |
| if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) { |
| (void) ngx_connection_error(c, wev->kq_errno, |
| "kevent() reported about an closed connection"); |
| wev->error = 1; |
| return NGX_CHAIN_ERROR; |
| } |
| |
| #endif |
| |
| /* the maximum limit size is the maximum size_t value - the page size */ |
| |
| if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) { |
| limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize; |
| } |
| |
| send = 0; |
| eagain = 0; |
| flags = 0; |
| |
| #if (NGX_HAVE_AIO_SENDFILE && NGX_SUPPRESS_WARN) |
| aio = NULL; |
| file = NULL; |
| #endif |
| |
| header.iovs = headers; |
| header.nalloc = NGX_IOVS_PREALLOCATE; |
| |
| trailer.iovs = trailers; |
| trailer.nalloc = NGX_IOVS_PREALLOCATE; |
| |
| for ( ;; ) { |
| eintr = 0; |
| #if (NGX_HAVE_AIO_SENDFILE) |
| ebusy = 0; |
| #endif |
| prev_send = send; |
| |
| /* create the header iovec and coalesce the neighbouring bufs */ |
| |
| cl = ngx_output_chain_to_iovec(&header, in, limit - send, c->log); |
| |
| if (cl == NGX_CHAIN_ERROR) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| send += header.size; |
| |
| if (cl && cl->buf->in_file && send < limit) { |
| file = cl->buf; |
| |
| /* coalesce the neighbouring file bufs */ |
| |
| file_size = (size_t) ngx_chain_coalesce_file(&cl, limit - send); |
| |
| send += file_size; |
| |
| /* create the trailer iovec and coalesce the neighbouring bufs */ |
| |
| cl = ngx_output_chain_to_iovec(&trailer, cl, limit - send, c->log); |
| |
| if (cl == NGX_CHAIN_ERROR) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| send += trailer.size; |
| |
| if (ngx_freebsd_use_tcp_nopush |
| && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET) |
| { |
| if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { |
| err = ngx_socket_errno; |
| |
| /* |
| * there is a tiny chance to be interrupted, however, |
| * we continue a processing without the TCP_NOPUSH |
| */ |
| |
| if (err != NGX_EINTR) { |
| wev->error = 1; |
| (void) ngx_connection_error(c, err, |
| ngx_tcp_nopush_n " failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| } else { |
| c->tcp_nopush = NGX_TCP_NOPUSH_SET; |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "tcp_nopush"); |
| } |
| } |
| |
| /* |
| * sendfile() does unneeded work if sf_hdtr's count is 0, |
| * but corresponding pointer is not NULL |
| */ |
| |
| hdtr.headers = header.count ? header.iovs : NULL; |
| hdtr.hdr_cnt = header.count; |
| hdtr.trailers = trailer.count ? trailer.iovs : NULL; |
| hdtr.trl_cnt = trailer.count; |
| |
| /* |
| * the "nbytes bug" of the old sendfile() syscall: |
| * http://bugs.freebsd.org/33771 |
| */ |
| |
| if (!ngx_freebsd_sendfile_nbytes_bug) { |
| header.size = 0; |
| } |
| |
| sent = 0; |
| |
| #if (NGX_HAVE_AIO_SENDFILE) |
| aio = file->file->aio; |
| flags = (aio && aio->preload_handler) ? SF_NODISKIO : 0; |
| #endif |
| |
| rc = sendfile(file->file->fd, c->fd, file->file_pos, |
| file_size + header.size, &hdtr, &sent, flags); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| |
| switch (err) { |
| case NGX_EAGAIN: |
| eagain = 1; |
| break; |
| |
| case NGX_EINTR: |
| eintr = 1; |
| break; |
| |
| #if (NGX_HAVE_AIO_SENDFILE) |
| case NGX_EBUSY: |
| ebusy = 1; |
| break; |
| #endif |
| |
| default: |
| wev->error = 1; |
| (void) ngx_connection_error(c, err, "sendfile() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err, |
| "sendfile() sent only %O bytes", sent); |
| |
| /* |
| * sendfile() in FreeBSD 3.x-4.x may return value >= 0 |
| * on success, although only 0 is documented |
| */ |
| |
| } else if (rc >= 0 && sent == 0) { |
| |
| /* |
| * if rc is OK and sent equal to zero, then someone |
| * has truncated the file, so the offset became beyond |
| * the end of the file |
| */ |
| |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "sendfile() reported that \"%s\" was truncated at %O", |
| file->file->name.data, file->file_pos); |
| |
| return NGX_CHAIN_ERROR; |
| } |
| |
| ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "sendfile: %d, @%O %O:%uz", |
| rc, file->file_pos, sent, file_size + header.size); |
| |
| } else { |
| n = ngx_writev(c, &header); |
| |
| if (n == NGX_ERROR) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| sent = (n == NGX_AGAIN) ? 0 : n; |
| } |
| |
| c->sent += sent; |
| |
| in = ngx_chain_update_sent(in, sent); |
| |
| #if (NGX_HAVE_AIO_SENDFILE) |
| |
| if (ebusy) { |
| if (sent == 0) { |
| c->busy_count++; |
| |
| if (c->busy_count > 2) { |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "sendfile(%V) returned busy again", |
| &file->file->name); |
| |
| c->busy_count = 0; |
| aio->preload_handler = NULL; |
| |
| send = prev_send; |
| continue; |
| } |
| |
| } else { |
| c->busy_count = 0; |
| } |
| |
| n = aio->preload_handler(file); |
| |
| if (n > 0) { |
| send = prev_send + sent; |
| continue; |
| } |
| |
| return in; |
| } |
| |
| if (flags == SF_NODISKIO) { |
| c->busy_count = 0; |
| } |
| |
| #endif |
| |
| if (eagain) { |
| |
| /* |
| * sendfile() may return EAGAIN, even if it has sent a whole file |
| * part, it indicates that the successive sendfile() call would |
| * return EAGAIN right away and would not send anything. |
| * We use it as a hint. |
| */ |
| |
| wev->ready = 0; |
| return in; |
| } |
| |
| if (eintr) { |
| send = prev_send + sent; |
| continue; |
| } |
| |
| if (send - prev_send != sent) { |
| wev->ready = 0; |
| return in; |
| } |
| |
| if (send >= limit || in == NULL) { |
| return in; |
| } |
| } |
| } |
