diff options
Diffstat (limited to 'app/nginx/src/os/unix/ngx_freebsd_sendfile_chain.c')
| -rw-r--r-- | app/nginx/src/os/unix/ngx_freebsd_sendfile_chain.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/app/nginx/src/os/unix/ngx_freebsd_sendfile_chain.c b/app/nginx/src/os/unix/ngx_freebsd_sendfile_chain.c new file mode 100644 index 0000000..4822e72 --- /dev/null +++ b/app/nginx/src/os/unix/ngx_freebsd_sendfile_chain.c @@ -0,0 +1,333 @@ + +/* + * 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; + + if (send < limit) { + + /* + * 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; + + } else { + trailer.count = 0; + } + + 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 (aio->event.active) { + /* + * tolerate duplicate calls; they can happen due to subrequests + * or multiple calls of the next body filter from a filter + */ + + if (sent) { + c->busy_count = 0; + } + + return in; + } + + 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; + } + } +} |