initial commit
This commit is contained in:
@@ -0,0 +1,308 @@
|
||||
|
||||
/*
|
||||
* 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_err_t err;
|
||||
ngx_buf_t *file;
|
||||
ngx_uint_t eintr, eagain;
|
||||
#if (NGX_HAVE_SENDFILE_NODISKIO)
|
||||
ngx_uint_t ebusy;
|
||||
#endif
|
||||
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];
|
||||
|
||||
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;
|
||||
|
||||
header.iovs = headers;
|
||||
header.nalloc = NGX_IOVS_PREALLOCATE;
|
||||
|
||||
trailer.iovs = trailers;
|
||||
trailer.nalloc = NGX_IOVS_PREALLOCATE;
|
||||
|
||||
for ( ;; ) {
|
||||
eintr = 0;
|
||||
#if (NGX_HAVE_SENDFILE_NODISKIO)
|
||||
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) == -1) {
|
||||
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_SENDFILE_NODISKIO)
|
||||
|
||||
flags = (c->busy_count <= 2) ? SF_NODISKIO : 0;
|
||||
|
||||
if (file->file->directio) {
|
||||
flags |= SF_NOCACHE;
|
||||
}
|
||||
|
||||
#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_SENDFILE_NODISKIO)
|
||||
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_SENDFILE_NODISKIO)
|
||||
|
||||
if (ebusy) {
|
||||
if (sent == 0) {
|
||||
c->busy_count++;
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
||||
"sendfile() busy, count:%d", c->busy_count);
|
||||
|
||||
} else {
|
||||
c->busy_count = 0;
|
||||
}
|
||||
|
||||
if (wev->posted) {
|
||||
ngx_delete_posted_event(wev);
|
||||
}
|
||||
|
||||
ngx_post_event(wev, &ngx_posted_next_events);
|
||||
|
||||
wev->ready = 0;
|
||||
return in;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user