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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define NGX_WSABUFS 8
ngx_chain_t *
ngx_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
int rc;
u_char *prev;
u_long size, sent, send, prev_send;
ngx_err_t err;
ngx_event_t *wev;
ngx_array_t vec;
ngx_chain_t *cl;
LPWSABUF wsabuf;
WSABUF wsabufs[NGX_WSABUFS];
wev = c->write;
if (!wev->ready) {
return in;
}
/* the maximum limit size is the maximum u_long value - the page size */
if (limit == 0 || limit > (off_t) (NGX_MAX_UINT32_VALUE - ngx_pagesize)) {
limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
}
send = 0;
/*
* WSABUFs must be 4-byte aligned otherwise
* WSASend() will return undocumented WSAEINVAL error.
*/
vec.elts = wsabufs;
vec.size = sizeof(WSABUF);
vec.nalloc = NGX_WSABUFS;
vec.pool = c->pool;
for ( ;; ) {
prev = NULL;
wsabuf = NULL;
prev_send = send;
vec.nelts = 0;
/* create the WSABUF and coalesce the neighbouring bufs */
for (cl = in;
cl && vec.nelts < ngx_max_wsabufs && send < limit;
cl = cl->next)
{
if (ngx_buf_special(cl->buf)) {
continue;
}
size = cl->buf->last - cl->buf->pos;
if (send + size > limit) {
size = (u_long) (limit - send);
}
if (prev == cl->buf->pos) {
wsabuf->len += cl->buf->last - cl->buf->pos;
} else {
wsabuf = ngx_array_push(&vec);
if (wsabuf == NULL) {
return NGX_CHAIN_ERROR;
}
wsabuf->buf = (char *) cl->buf->pos;
wsabuf->len = cl->buf->last - cl->buf->pos;
}
prev = cl->buf->last;
send += size;
}
sent = 0;
rc = WSASend(c->fd, vec.elts, vec.nelts, &sent, 0, NULL, NULL);
if (rc == -1) {
err = ngx_errno;
if (err == WSAEWOULDBLOCK) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"WSASend() not ready");
} else {
wev->error = 1;
ngx_connection_error(c, err, "WSASend() failed");
return NGX_CHAIN_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSASend: fd:%d, s:%ul", c->fd, sent);
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;
}
}
}
ngx_chain_t *
ngx_overlapped_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
int rc;
u_char *prev;
u_long size, send, sent;
ngx_err_t err;
ngx_event_t *wev;
ngx_array_t vec;
ngx_chain_t *cl;
LPWSAOVERLAPPED ovlp;
LPWSABUF wsabuf;
WSABUF wsabufs[NGX_WSABUFS];
wev = c->write;
if (!wev->ready) {
return in;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"wev->complete: %d", wev->complete);
if (!wev->complete) {
/* post the overlapped WSASend() */
/* the maximum limit size is the maximum u_long value - the page size */
if (limit == 0 || limit > (off_t) (NGX_MAX_UINT32_VALUE - ngx_pagesize))
{
limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
}
/*
* WSABUFs must be 4-byte aligned otherwise
* WSASend() will return undocumented WSAEINVAL error.
*/
vec.elts = wsabufs;
vec.nelts = 0;
vec.size = sizeof(WSABUF);
vec.nalloc = NGX_WSABUFS;
vec.pool = c->pool;
send = 0;
prev = NULL;
wsabuf = NULL;
/* create the WSABUF and coalesce the neighbouring bufs */
for (cl = in;
cl && vec.nelts < ngx_max_wsabufs && send < limit;
cl = cl->next)
{
if (ngx_buf_special(cl->buf)) {
continue;
}
size = cl->buf->last - cl->buf->pos;
if (send + size > limit) {
size = (u_long) (limit - send);
}
if (prev == cl->buf->pos) {
wsabuf->len += cl->buf->last - cl->buf->pos;
} else {
wsabuf = ngx_array_push(&vec);
if (wsabuf == NULL) {
return NGX_CHAIN_ERROR;
}
wsabuf->buf = (char *) cl->buf->pos;
wsabuf->len = cl->buf->last - cl->buf->pos;
}
prev = cl->buf->last;
send += size;
}
ovlp = (LPWSAOVERLAPPED) &c->write->ovlp;
ngx_memzero(ovlp, sizeof(WSAOVERLAPPED));
rc = WSASend(c->fd, vec.elts, vec.nelts, &sent, 0, ovlp, NULL);
wev->complete = 0;
if (rc == -1) {
err = ngx_errno;
if (err == WSA_IO_PENDING) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"WSASend() posted");
wev->active = 1;
return in;
} else {
wev->error = 1;
ngx_connection_error(c, err, "WSASend() failed");
return NGX_CHAIN_ERROR;
}
} else if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
/*
* if a socket was bound with I/O completion port then
* GetQueuedCompletionStatus() would anyway return its status
* despite that WSASend() was already complete
*/
wev->active = 1;
return in;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSASend: fd:%d, s:%ul", c->fd, sent);
} else {
/* the overlapped WSASend() complete */
wev->complete = 0;
wev->active = 0;
if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
if (wev->ovlp.error) {
ngx_connection_error(c, wev->ovlp.error, "WSASend() failed");
return NGX_CHAIN_ERROR;
}
sent = wev->available;
} else {
if (WSAGetOverlappedResult(c->fd, (LPWSAOVERLAPPED) &wev->ovlp,
&sent, 0, NULL)
== 0)
{
ngx_connection_error(c, ngx_socket_errno,
"WSASend() or WSAGetOverlappedResult() failed");
return NGX_CHAIN_ERROR;
}
}
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSASend ovlp: fd:%d, s:%ul", c->fd, sent);
c->sent += sent;
in = ngx_chain_update_sent(in, sent);
if (in) {
wev->ready = 0;
} else {
wev->ready = 1;
}
return in;
}
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