+++ /dev/null
-
-/*
- * 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;
- }
- }
-}
Code Review / tldk.git / blobdiff