mirror of
https://github.com/nginx/nginx.git
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313 lines
8.7 KiB
C
313 lines
8.7 KiB
C
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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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* FreeBSD's sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460
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* and 1176 or in 6 packets: 5x1460 and 892. Besides although sendfile()
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* allows to pass the header and the trailer it never sends the header or
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* the trailer with the part of the file in one packet. So we use TCP_NOPUSH
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* (similar to Linux's TCP_CORK) to postpone the sending - it not only sends
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* the header and the first part of the file in one packet but also sends
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* 4K pages in the full packets.
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*
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* 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 can be sent with 5 second delay.
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* 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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{
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int rc;
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char *prev;
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off_t sent, fprev;
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size_t hsize, fsize, size;
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ngx_int_t eintr, eagain, level;
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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_hunk_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, *tail;
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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 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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do {
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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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eagain = 0;
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level = NGX_LOG_CRIT;
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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 hunks */
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prev = NULL;
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iov = NULL;
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for (cl = in; cl; cl = cl->next) {
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if (ngx_hunk_special(cl->hunk)) {
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continue;
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}
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if (!ngx_hunk_in_memory_only(cl->hunk)) {
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break;
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}
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if (prev == cl->hunk->pos) {
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iov->iov_len += cl->hunk->last - cl->hunk->pos;
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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 = cl->hunk->pos;
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iov->iov_len = cl->hunk->last - cl->hunk->pos;
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}
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prev = cl->hunk->last;
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hsize += cl->hunk->last - cl->hunk->pos;
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}
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/* get the file hunk */
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if (cl && (cl->hunk->type & NGX_HUNK_FILE)) {
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file = cl->hunk;
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fsize = (size_t) (file->file_last - file->file_pos);
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fprev = file->file_last;
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cl = cl->next;
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/* coalesce the neighbouring file hunks */
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while (cl && (cl->hunk->type & NGX_HUNK_FILE)) {
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if (file->file->fd != cl->hunk->file->fd
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|| fprev != cl->hunk->file_pos)
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{
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break;
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}
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fsize += (size_t) (cl->hunk->file_last - cl->hunk->file_pos);
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fprev = cl->hunk->file_last;
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cl = cl->next;
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}
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}
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/* create the tailer iovec and coalesce the neighbouring hunks */
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prev = NULL;
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iov = NULL;
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for ( /* void */; cl; cl = cl->next) {
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if (ngx_hunk_special(cl->hunk)) {
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continue;
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}
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if (!ngx_hunk_in_memory_only(cl->hunk)) {
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break;
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}
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if (prev == cl->hunk->pos) {
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iov->iov_len += cl->hunk->last - cl->hunk->pos;
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} else {
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ngx_test_null(iov, ngx_push_array(&trailer), NGX_CHAIN_ERROR);
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iov->iov_base = cl->hunk->pos;
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iov->iov_len = cl->hunk->last - cl->hunk->pos;
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}
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prev = cl->hunk->last;
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}
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/*
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* the tail is the rest of the chain that exceeded
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* a single sendfile() capability
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*/
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tail = cl;
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if (file) {
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if (ngx_freebsd_use_tcp_nopush && c->tcp_nopush == 0) {
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c->tcp_nopush = 1;
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "tcp_nopush");
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if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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ngx_log_error(NGX_LOG_CRIT, c->log, ngx_errno,
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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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}
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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_EINTR) {
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eintr = 1;
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} else if (err == NGX_EAGAIN) {
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eagain = 1;
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} else if (err == NGX_EPIPE || err == NGX_ENOTCONN) {
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level = NGX_LOG_INFO;
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}
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if (err == NGX_EAGAIN || err == NGX_EINTR) {
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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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#if 0
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ngx_log_error(level, c->log, err,
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"sendfile() failed");
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#else
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ngx_log_error(level, c->log, err,
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"sendfile(#%d) failed", c->fd);
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#endif
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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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if (rc == -1) {
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err = ngx_errno;
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if (err == NGX_EINTR) {
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eintr = 1;
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} else if (err == NGX_EPIPE) {
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level = NGX_LOG_INFO;
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}
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if (err == NGX_EAGAIN || err == NGX_EINTR) {
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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_log_error(level, c->log, 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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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"writev: " OFF_T_FMT, sent);
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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_hunk_special(cl->hunk)) {
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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_hunk_size(cl->hunk);
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if (sent >= size) {
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sent -= size;
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if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
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cl->hunk->pos = cl->hunk->last;
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}
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if (cl->hunk->type & NGX_HUNK_FILE) {
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cl->hunk->file_pos = cl->hunk->file_last;
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}
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continue;
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}
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if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
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cl->hunk->pos += sent;
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}
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if (cl->hunk->type & NGX_HUNK_FILE) {
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cl->hunk->file_pos += sent;
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}
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break;
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}
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in = cl;
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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 and successive sendfile() would
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* return EAGAIN right away and would not send anything
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*/
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wev->ready = 0;
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break;
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}
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/* "tail == in" means that a single sendfile() is complete */
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} while ((tail && tail == in) || eintr);
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if (in) {
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wev->ready = 0;
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}
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return in;
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}
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