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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_freebsd_init.h>
/*
* sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460 and 1176
* or in 6 packets: 5x1460 and 892. Besides although sendfile() allows
* to pass the header and the trailer it never sends the header or the trailer
* with the part of the file in one packet. So we use TCP_NOPUSH (similar
* to Linux's TCP_CORK) to postpone the sending - it not only sends the header
* and the first part of the file in one packet but also sends 4K pages
* in the full packets.
*
* Until FreeBSD 4.5 the turning TCP_NOPUSH off does not flush
* the pending data that less than MSS so the data is sent with 5 second delay.
* 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)
{
int rc, eintr;
char *prev;
ssize_t hsize, size;
off_t sent;
struct iovec *iov;
struct sf_hdtr hdtr;
ngx_err_t err;
ngx_array_t header, trailer;
ngx_hunk_t *file;
ngx_chain_t *ce, *tail;
do {
ce = in;
file = NULL;
hsize = 0;
eintr = 0;
ngx_init_array(header, c->pool, 10, sizeof(struct iovec),
NGX_CHAIN_ERROR);
ngx_init_array(trailer, c->pool, 10, sizeof(struct iovec),
NGX_CHAIN_ERROR);
/* create the iovec and coalesce the neighbouring chain entries */
prev = NULL;
iov = NULL;
for (ce = in; ce; ce = ce->next) {
if (ngx_hunk_special(ce->hunk)) {
continue;
}
if (!ngx_hunk_in_memory_only(ce->hunk)) {
break;
}
if (prev == ce->hunk->pos) {
iov->iov_len += ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
} else {
ngx_test_null(iov, ngx_push_array(&header), NGX_CHAIN_ERROR);
iov->iov_base = ce->hunk->pos;
iov->iov_len = ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
}
hsize += ce->hunk->last - ce->hunk->pos;
}
/* TODO: coalesce the neighbouring file hunks */
if (ce && (ce->hunk->type & NGX_HUNK_FILE)) {
file = ce->hunk;
ce = ce->next;
}
/* create the iovec and coalesce the neighbouring chain entries */
prev = NULL;
iov = NULL;
for ( /* void */; ce; ce = ce->next) {
if (ngx_hunk_special(ce->hunk)) {
continue;
}
if (!ngx_hunk_in_memory_only(ce->hunk)) {
break;
}
if (prev == ce->hunk->pos) {
iov->iov_len += ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
} else {
ngx_test_null(iov, ngx_push_array(&trailer), NGX_CHAIN_ERROR);
iov->iov_base = ce->hunk->pos;
iov->iov_len = ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
}
}
tail = ce;
if (file) {
if (ngx_freebsd_use_tcp_nopush && !c->tcp_nopush) {
c->tcp_nopush = 1;
ngx_log_debug(c->log, "NOPUSH");
if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
ngx_tcp_nopush_n " failed");
return NGX_CHAIN_ERROR;
}
}
hdtr.headers = (struct iovec *) header.elts;
hdtr.hdr_cnt = header.nelts;
hdtr.trailers = (struct iovec *) trailer.elts;
hdtr.trl_cnt = trailer.nelts;
if (ngx_freebsd_sendfile_nbytes_bug == 0) {
hsize = 0;
}
rc = sendfile(file->file->fd, c->fd, file->file_pos,
(size_t) (file->file_last - file->file_pos) + hsize,
&hdtr, &sent, 0);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EINTR) {
eintr = 1;
}
if (err == NGX_EAGAIN || err == NGX_EINTR) {
ngx_log_error(NGX_LOG_INFO, c->log, err,
"sendfile() sent only %qd bytes", sent);
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err,
"sendfile() failed");
return NGX_CHAIN_ERROR;
}
}
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "sendfile: %d, @%qd %qd:%d" _
rc _ file->file_pos _ sent _
(size_t) (file->file_last - file->file_pos) + hsize);
#endif
} else {
rc = writev(c->fd, (struct iovec *) header.elts, header.nelts);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN");
} else if (err == NGX_EINTR) {
eintr = 1;
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EINTR");
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err, "writev() failed");
return NGX_CHAIN_ERROR;
}
}
sent = rc > 0 ? rc : 0;
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "writev: %qd" _ sent);
#endif
}
c->sent += sent;
for (ce = in; ce && sent > 0; ce = ce->next) {
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
size = ce->hunk->last - ce->hunk->pos;
} else {
size = ce->hunk->file_last - ce->hunk->file_pos;
}
if (sent >= size) {
sent -= size;
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
ce->hunk->pos = ce->hunk->last;
}
if (ce->hunk->type & NGX_HUNK_FILE) {
ce->hunk->file_pos = ce->hunk->file_last;
}
continue;
}
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
ce->hunk->pos += sent;
}
if (ce->hunk->type & NGX_HUNK_FILE) {
ce->hunk->file_pos += sent;
}
break;
}
ngx_destroy_array(&trailer);
ngx_destroy_array(&header);
in = ce;
} while ((tail && tail == ce) || eintr);
if (ce) {
c->write->ready = 0;
}
return ce;
}
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