| |
| /* |
| * 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. |
| * |
| * Threfore 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. |
| */ |
| |
| |
| #if (IOV_MAX > 64) |
| #define NGX_HEADERS 64 |
| #define NGX_TRAILERS 64 |
| #else |
| #define NGX_HEADERS IOV_MAX |
| #define NGX_TRAILERS IOV_MAX |
| #endif |
| |
| |
| ngx_chain_t * |
| ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) |
| { |
| int rc, flags; |
| u_char *prev; |
| off_t size, send, prev_send, aligned, sent, fprev; |
| size_t header_size, file_size; |
| ngx_uint_t eintr, eagain, complete; |
| ngx_err_t err; |
| ngx_buf_t *file; |
| ngx_array_t header, trailer; |
| ngx_event_t *wev; |
| ngx_chain_t *cl; |
| struct sf_hdtr hdtr; |
| struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS]; |
| |
| 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; |
| |
| header.elts = headers; |
| header.size = sizeof(struct iovec); |
| header.nalloc = NGX_HEADERS; |
| header.pool = c->pool; |
| |
| trailer.elts = trailers; |
| trailer.size = sizeof(struct iovec); |
| trailer.nalloc = NGX_TRAILERS; |
| trailer.pool = c->pool; |
| |
| for ( ;; ) { |
| file = NULL; |
| file_size = 0; |
| header_size = 0; |
| eintr = 0; |
| complete = 0; |
| prev_send = send; |
| |
| header.nelts = 0; |
| trailer.nelts = 0; |
| |
| /* create the header iovec and coalesce the neighbouring bufs */ |
| |
| prev = NULL; |
| iov = NULL; |
| |
| for (cl = in; |
| cl && header.nelts < IOV_MAX && send < limit; |
| cl = cl->next) |
| { |
| if (ngx_buf_special(cl->buf)) { |
| continue; |
| } |
| |
| if (!ngx_buf_in_memory_only(cl->buf)) { |
| break; |
| } |
| |
| size = cl->buf->last - cl->buf->pos; |
| |
| if (send + size > limit) { |
| size = limit - send; |
| } |
| |
| if (prev == cl->buf->pos) { |
| iov->iov_len += (size_t) size; |
| |
| } else { |
| iov = ngx_array_push(&header); |
| if (iov == NULL) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| iov->iov_base = (void *) cl->buf->pos; |
| iov->iov_len = (size_t) size; |
| } |
| |
| prev = cl->buf->pos + (size_t) size; |
| header_size += (size_t) size; |
| send += size; |
| } |
| |
| |
| if (cl && cl->buf->in_file && send < limit) { |
| file = cl->buf; |
| |
| /* coalesce the neighbouring file bufs */ |
| |
| do { |
| size = cl->buf->file_last - cl->buf->file_pos; |
| |
| if (send + size > limit) { |
| size = limit - send; |
| |
| aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
| & ~((off_t) ngx_pagesize - 1); |
| |
| if (aligned <= cl->buf->file_last) { |
| size = aligned - cl->buf->file_pos; |
| } |
| } |
| |
| file_size += (size_t) size; |
| send += size; |
| fprev = cl->buf->file_pos + size; |
| cl = cl->next; |
| |
| } while (cl |
| && cl->buf->in_file |
| && send < limit |
| && file->file->fd == cl->buf->file->fd |
| && fprev == cl->buf->file_pos); |
| } |
| |
| |
| if (file) { |
| |
| /* create the tailer iovec and coalesce the neighbouring bufs */ |
| |
| prev = NULL; |
| iov = NULL; |
| |
| while (cl && header.nelts < IOV_MAX && send < limit) { |
| |
| if (ngx_buf_special(cl->buf)) { |
| cl = cl->next; |
| continue; |
| } |
| |
| if (!ngx_buf_in_memory_only(cl->buf)) { |
| break; |
| } |
| |
| size = cl->buf->last - cl->buf->pos; |
| |
| if (send + size > limit) { |
| size = limit - send; |
| } |
| |
| if (prev == cl->buf->pos) { |
| iov->iov_len += (size_t) size; |
| |
| } else { |
| iov = ngx_array_push(&trailer); |
| if (iov == NULL) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| iov->iov_base = (void *) cl->buf->pos; |
| iov->iov_len = (size_t) size; |
| } |
| |
| prev = cl->buf->pos + (size_t) size; |
| send += size; |
| cl = cl->next; |
| } |
| } |
| |
| if (file) { |
| |
| if (ngx_freebsd_use_tcp_nopush |
| && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET) |
| { |
| if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { |
| err = ngx_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.nelts ? (struct iovec *) header.elts: NULL; |
| hdtr.hdr_cnt = header.nelts; |
| hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL; |
| 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) { |
| header_size = 0; |
| } |
| |
| sent = 0; |
| |
| #if (NGX_HAVE_AIO_SENDFILE) |
| flags = c->aio_sendfile ? 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: |
| c->busy_sendfile = file; |
| 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 { |
| rc = writev(c->fd, header.elts, header.nelts); |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "writev: %d of %uz", rc, header_size); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| |
| switch (err) { |
| case NGX_EAGAIN: |
| break; |
| |
| case NGX_EINTR: |
| eintr = 1; |
| break; |
| |
| default: |
| wev->error = 1; |
| ngx_connection_error(c, err, "writev() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
| "writev() not ready"); |
| } |
| |
| sent = rc > 0 ? rc : 0; |
| } |
| |
| if (send - prev_send == sent) { |
| complete = 1; |
| } |
| |
| c->sent += sent; |
| |
| for (cl = in; cl; cl = cl->next) { |
| |
| if (ngx_buf_special(cl->buf)) { |
| continue; |
| } |
| |
| if (sent == 0) { |
| break; |
| } |
| |
| size = ngx_buf_size(cl->buf); |
| |
| if (sent >= size) { |
| sent -= size; |
| |
| if (ngx_buf_in_memory(cl->buf)) { |
| cl->buf->pos = cl->buf->last; |
| } |
| |
| if (cl->buf->in_file) { |
| cl->buf->file_pos = cl->buf->file_last; |
| } |
| |
| continue; |
| } |
| |
| if (ngx_buf_in_memory(cl->buf)) { |
| cl->buf->pos += (size_t) sent; |
| } |
| |
| if (cl->buf->in_file) { |
| cl->buf->file_pos += sent; |
| } |
| |
| break; |
| } |
| |
| #if (NGX_HAVE_AIO_SENDFILE) |
| if (c->busy_sendfile) { |
| return cl; |
| } |
| #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 cl; |
| } |
| |
| if (eintr) { |
| continue; |
| } |
| |
| if (!complete) { |
| wev->ready = 0; |
| return cl; |
| } |
| |
| if (send >= limit || cl == NULL) { |
| return cl; |
| } |
| |
| in = cl; |
| } |
| } |
