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