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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
/*
* It seems that Darwin 9.4 (Mac OS X 1.5) sendfile() has the same
* old bug as early FreeBSD sendfile() syscall:
* http://bugs.freebsd.org/33771
*
* Besides sendfile() has another bug: if one calls sendfile()
* with both a header and a trailer, then sendfile() ignores a file part
* at all and sends only the header and the trailer together.
* For this reason we send a trailer only if there is no a header.
*
* Although sendfile() allows to pass a header or a trailer,
* it may send the header or the trailer and a part of the file
* in different packets. And FreeBSD workaround (TCP_NOPUSH option)
* does not help.
*/
ngx_chain_t *
ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
int rc;
off_t send, prev_send, sent;
off_t file_size;
ssize_t n;
ngx_uint_t eintr;
ngx_err_t err;
ngx_buf_t *file;
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;
header.iovs = headers;
header.nalloc = NGX_IOVS_PREALLOCATE;
trailer.iovs = trailers;
trailer.nalloc = NGX_IOVS_PREALLOCATE;
for ( ;; ) {
eintr = 0;
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 = ngx_chain_coalesce_file(&cl, limit - send);
send += file_size;
if (header.count == 0 && 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;
}
/*
* sendfile() returns EINVAL 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;
sent = header.size + file_size;
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"sendfile: @%O %O h:%uz",
file->file_pos, sent, header.size);
rc = sendfile(file->file->fd, c->fd, file->file_pos,
&sent, &hdtr, 0);
if (rc == -1) {
err = ngx_errno;
switch (err) {
case NGX_EAGAIN:
break;
case NGX_EINTR:
eintr = 1;
break;
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);
}
if (rc == 0 && sent == 0) {
/*
* if rc 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",
file->file->name.data);
return NGX_CHAIN_ERROR;
}
ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
"sendfile: %d, @%O %O:%O",
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 (eintr) {
send = prev_send + sent;
continue;
}
if (send - prev_send != sent) {
wev->ready = 0;
return in;
}
if (send >= limit || in == NULL) {
return in;
}
}
}
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