207 lines
5.5 KiB
C
207 lines
5.5 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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* It seems that Darwin 9.4 (Mac OS X 1.5) sendfile() has the same
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* old bug as early FreeBSD sendfile() syscall:
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* http://bugs.freebsd.org/33771
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*
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* Besides sendfile() has another bug: if one calls sendfile()
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* with both a header and a trailer, then sendfile() ignores a file part
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* at all and sends only the header and the trailer together.
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* For this reason we send a trailer only if there is no a header.
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*
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* Although sendfile() allows to pass a header or a trailer,
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* it may send the header or the trailer and a part of the file
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* in different packets. And FreeBSD workaround (TCP_NOPUSH option)
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* does not help.
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*/
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ngx_chain_t *
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ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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{
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int rc;
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off_t send, prev_send, sent;
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off_t file_size;
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ssize_t n;
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ngx_uint_t eintr;
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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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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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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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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 = ngx_chain_coalesce_file(&cl, limit - send);
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send += file_size;
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if (header.count == 0 && 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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/*
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* sendfile() returns EINVAL 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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sent = header.size + file_size;
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ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"sendfile: @%O %O h:%uz",
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file->file_pos, sent, header.size);
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rc = sendfile(file->file->fd, c->fd, file->file_pos,
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&sent, &hdtr, 0);
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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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break;
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case NGX_EINTR:
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eintr = 1;
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break;
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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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if (rc == 0 && sent == 0) {
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/*
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* if rc 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",
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file->file->name.data);
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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:%O",
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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 (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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