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https://github.com/nginx/nginx.git
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365 lines
10 KiB
C
365 lines
10 KiB
C
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/*
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* Copyright (C) 2002-2004 Igor Sysoev, http://sysoev.ru/en/
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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 can not send a header with a part of the file in one packet until
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* FreeBSD 5.2-STABLE. 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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* So 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
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* of the file in one packet but also sends file pages in the full packets.
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*
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* But until FreeBSD 4.5 the 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 *ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
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off_t limit)
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{
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int rc;
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u_char *prev;
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off_t fprev, sent, send, sprev, aligned;
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size_t hsize, fsize;
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ssize_t size;
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ngx_uint_t eintr, eagain, complete;
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struct iovec *iov;
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struct sf_hdtr hdtr;
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ngx_err_t err;
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ngx_buf_t *file;
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ngx_array_t header, trailer;
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ngx_event_t *wev;
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ngx_chain_t *cl;
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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 (HAVE_KQUEUE)
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if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && wev->kq_eof) {
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ngx_log_error(NGX_LOG_INFO, c->log, 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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send = 0;
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eagain = 0;
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for ( ;; ) {
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file = NULL;
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fsize = 0;
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hsize = 0;
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eintr = 0;
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complete = 0;
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sprev = send;
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ngx_init_array(header, c->pool, 10, sizeof(struct iovec),
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NGX_CHAIN_ERROR);
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ngx_init_array(trailer, c->pool, 10, sizeof(struct iovec),
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NGX_CHAIN_ERROR);
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/* create the header iovec and coalesce the neighbouring bufs */
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prev = NULL;
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iov = NULL;
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for (cl = in;
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cl && header.nelts < IOV_MAX && send < limit;
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cl = cl->next)
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{
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if (ngx_buf_special(cl->buf)) {
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continue;
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}
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if (!ngx_buf_in_memory_only(cl->buf)) {
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break;
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}
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size = cl->buf->last - cl->buf->pos;
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if (send + size > limit) {
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size = limit - send;
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}
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if (prev == cl->buf->pos) {
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iov->iov_len += size;
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} else {
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ngx_test_null(iov, ngx_push_array(&header), NGX_CHAIN_ERROR);
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iov->iov_base = (void *) cl->buf->pos;
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iov->iov_len = size;
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}
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prev = cl->buf->pos + size;
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hsize += size;
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send += size;
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}
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/* get the file buf */
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if (cl && cl->buf->in_file && send < limit) {
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file = cl->buf;
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fsize = 0;
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/* coalesce the neighbouring file bufs */
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do {
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size = (size_t) (cl->buf->file_last - cl->buf->file_pos);
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if (send + size > limit) {
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size = limit - send;
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aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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& ~(ngx_pagesize - 1);
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if (aligned <= cl->buf->file_last) {
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size = aligned - cl->buf->file_pos;
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}
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}
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fsize += size;
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send += size;
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fprev = cl->buf->file_pos + size;
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cl = cl->next;
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} while (cl
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&& cl->buf->in_file
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&& send < limit
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&& file->file->fd == cl->buf->file->fd
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&& fprev == cl->buf->file_pos);
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}
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if (file) {
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/* create the tailer iovec and coalesce the neighbouring bufs */
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prev = NULL;
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iov = NULL;
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for (/* void */;
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cl && header.nelts < IOV_MAX && send < limit;
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cl = cl->next)
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{
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if (ngx_buf_special(cl->buf)) {
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continue;
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}
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if (!ngx_buf_in_memory_only(cl->buf)) {
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break;
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}
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size = cl->buf->last - cl->buf->pos;
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if (send + size > limit) {
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size = limit - send;
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}
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if (prev == cl->buf->pos) {
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iov->iov_len += size;
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} else {
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ngx_test_null(iov, ngx_push_array(&trailer),
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NGX_CHAIN_ERROR);
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iov->iov_base = (void *) cl->buf->pos;
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iov->iov_len = size;
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}
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prev = cl->buf->pos + size;
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send += size;
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}
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}
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if (file) {
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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_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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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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hdtr.headers = (struct iovec *) header.elts;
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hdtr.hdr_cnt = header.nelts;
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hdtr.trailers = (struct iovec *) trailer.elts;
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hdtr.trl_cnt = trailer.nelts;
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/*
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* the "nbytes bug" of the old sendfile() syscall:
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* http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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*/
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if (ngx_freebsd_sendfile_nbytes_bug == 0) {
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hsize = 0;
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}
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sent = 0;
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rc = sendfile(file->file->fd, c->fd, file->file_pos,
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fsize + hsize, &hdtr, &sent, 0);
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if (rc == -1) {
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err = ngx_errno;
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if (err == NGX_EAGAIN || err == NGX_EINTR) {
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if (err == NGX_EINTR) {
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eintr = 1;
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} else {
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eagain = 1;
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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 " OFF_T_FMT " bytes",
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sent);
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} else {
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wev->error = 1;
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ngx_connection_error(c, err, "sendfile() failed");
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return NGX_CHAIN_ERROR;
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}
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}
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ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"sendfile: %d, @" OFF_T_FMT " " OFF_T_FMT ":%d",
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rc, file->file_pos, sent, fsize + hsize);
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} else {
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rc = writev(c->fd, header.elts, header.nelts);
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"writev: %d of " SIZE_T_FMT, rc, hsize);
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if (rc == -1) {
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err = ngx_errno;
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if (err == NGX_EAGAIN || err == NGX_EINTR) {
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if (err == NGX_EINTR) {
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eintr = 1;
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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"writev() not ready");
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} else {
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wev->error = 1;
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ngx_connection_error(c, err, "writev() failed");
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return NGX_CHAIN_ERROR;
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}
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}
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sent = rc > 0 ? rc : 0;
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}
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if (send - sprev == sent) {
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complete = 1;
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}
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c->sent += sent;
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for (cl = in; cl; cl = cl->next) {
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if (ngx_buf_special(cl->buf)) {
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continue;
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}
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if (sent == 0) {
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break;
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}
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size = ngx_buf_size(cl->buf);
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if (sent >= size) {
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sent -= size;
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if (ngx_buf_in_memory(cl->buf)) {
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cl->buf->pos = cl->buf->last;
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}
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if (cl->buf->in_file) {
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cl->buf->file_pos = cl->buf->file_last;
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}
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continue;
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}
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if (ngx_buf_in_memory(cl->buf)) {
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cl->buf->pos += sent;
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}
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if (cl->buf->in_file) {
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cl->buf->file_pos += sent;
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}
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break;
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}
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if (eagain) {
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/*
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* sendfile() can return EAGAIN even if it has sent
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* a whole file part but 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 cl;
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}
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if (eintr) {
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continue;
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}
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if (!complete) {
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wev->ready = 0;
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return cl;
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}
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if (send >= limit || cl == NULL) {
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return cl;
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}
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in = cl;
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}
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}
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