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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
static ssize_t ngx_linux_sendfile(ngx_connection_t *c, ngx_buf_t *file,
size_t size);
/*
* On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit
* offsets only, and the including <sys/sendfile.h> breaks the compiling,
* if off_t is 64 bit wide. So we use own sendfile() definition, where offset
* parameter is int32_t, and use sendfile() for the file parts below 2G only,
* see src/os/unix/ngx_linux_config.h
*
* Linux 2.4.21 has the new sendfile64() syscall #239.
*
* On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter
* more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL,
* so we limit it to 2G-1 bytes.
*/
#define NGX_SENDFILE_MAXSIZE 2147483647L
ngx_chain_t *
ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
int tcp_nodelay;
off_t send, prev_send, sent;
size_t file_size;
ssize_t n;
ngx_err_t err;
ngx_buf_t *file;
ngx_event_t *wev;
ngx_chain_t *cl;
ngx_iovec_t header;
struct iovec headers[NGX_IOVS_PREALLOCATE];
wev = c->write;
if (!wev->ready) {
return in;
}
/* the maximum limit size is 2G-1 - the page size */
if (limit == 0 || limit > (off_t) (NGX_SENDFILE_MAXSIZE - ngx_pagesize)) {
limit = NGX_SENDFILE_MAXSIZE - ngx_pagesize;
}
send = 0;
header.iovs = headers;
header.nalloc = NGX_IOVS_PREALLOCATE;
for ( ;; ) {
prev_send = send;
/* create the 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;
/* set TCP_CORK if there is a header before a file */
if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
&& header.count != 0
&& cl
&& cl->buf->in_file)
{
/* the TCP_CORK and TCP_NODELAY are mutually exclusive */
if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
tcp_nodelay = 0;
if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
(const void *) &tcp_nodelay, sizeof(int)) == -1)
{
err = ngx_socket_errno;
/*
* there is a tiny chance to be interrupted, however,
* we continue a processing with the TCP_NODELAY
* and without the TCP_CORK
*/
if (err != NGX_EINTR) {
wev->error = 1;
ngx_connection_error(c, err,
"setsockopt(TCP_NODELAY) failed");
return NGX_CHAIN_ERROR;
}
} else {
c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"no tcp_nodelay");
}
}
if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
err = ngx_socket_errno;
/*
* there is a tiny chance to be interrupted, however,
* we continue a processing without the TCP_CORK
*/
if (err != NGX_EINTR) {
wev->error = 1;
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");
}
}
}
/* get the file buf */
if (header.count == 0 && 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 1
if (file_size == 0) {
ngx_debug_point();
return NGX_CHAIN_ERROR;
}
#endif
n = ngx_linux_sendfile(c, file, file_size);
if (n == NGX_ERROR) {
return NGX_CHAIN_ERROR;
}
sent = (n == NGX_AGAIN) ? 0 : n;
} 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 (send - prev_send != sent) {
wev->ready = 0;
return in;
}
if (send >= limit || in == NULL) {
return in;
}
}
}
static ssize_t
ngx_linux_sendfile(ngx_connection_t *c, ngx_buf_t *file, size_t size)
{
#if (NGX_HAVE_SENDFILE64)
off_t offset;
#else
int32_t offset;
#endif
ssize_t n;
ngx_err_t err;
#if (NGX_HAVE_SENDFILE64)
offset = file->file_pos;
#else
offset = (int32_t) file->file_pos;
#endif
eintr:
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"sendfile: @%O %uz", file->file_pos, size);
n = sendfile(c->fd, file->file->fd, &offset, size);
if (n == -1) {
err = ngx_errno;
switch (err) {
case NGX_EAGAIN:
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"sendfile() is not ready");
return NGX_AGAIN;
case NGX_EINTR:
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"sendfile() was interrupted");
goto eintr;
default:
c->write->error = 1;
ngx_connection_error(c, err, "sendfile() failed");
return NGX_ERROR;
}
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "sendfile: %z of %uz @%O",
n, size, file->file_pos);
return n;
}
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