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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
ssize_t
ngx_udp_wsarecv(ngx_connection_t *c, u_char *buf, size_t size)
{
int rc;
u_long bytes, flags;
WSABUF wsabuf[1];
ngx_err_t err;
ngx_event_t *rev;
wsabuf[0].buf = (char *) buf;
wsabuf[0].len = size;
flags = 0;
bytes = 0;
rc = WSARecv(c->fd, wsabuf, 1, &bytes, &flags, NULL, NULL);
ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSARecv: fd:%d rc:%d %ul of %z", c->fd, rc, bytes, size);
rev = c->read;
if (rc == -1) {
rev->ready = 0;
err = ngx_socket_errno;
if (err == WSAEWOULDBLOCK) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"WSARecv() not ready");
return NGX_AGAIN;
}
rev->error = 1;
ngx_connection_error(c, err, "WSARecv() failed");
return NGX_ERROR;
}
return bytes;
}
ssize_t
ngx_udp_overlapped_wsarecv(ngx_connection_t *c, u_char *buf, size_t size)
{
int rc;
u_long bytes, flags;
WSABUF wsabuf[1];
ngx_err_t err;
ngx_event_t *rev;
LPWSAOVERLAPPED ovlp;
rev = c->read;
if (!rev->ready) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "second wsa post");
return NGX_AGAIN;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"rev->complete: %d", rev->complete);
if (rev->complete) {
rev->complete = 0;
if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
if (rev->ovlp.error) {
ngx_connection_error(c, rev->ovlp.error, "WSARecv() failed");
return NGX_ERROR;
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSARecv ovlp: fd:%d %ul of %z",
c->fd, rev->available, size);
return rev->available;
}
if (WSAGetOverlappedResult(c->fd, (LPWSAOVERLAPPED) &rev->ovlp,
&bytes, 0, NULL)
== 0)
{
ngx_connection_error(c, ngx_socket_errno,
"WSARecv() or WSAGetOverlappedResult() failed");
return NGX_ERROR;
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSARecv: fd:%d %ul of %z", c->fd, bytes, size);
return bytes;
}
ovlp = (LPWSAOVERLAPPED) &rev->ovlp;
ngx_memzero(ovlp, sizeof(WSAOVERLAPPED));
wsabuf[0].buf = (char *) buf;
wsabuf[0].len = size;
flags = 0;
bytes = 0;
rc = WSARecv(c->fd, wsabuf, 1, &bytes, &flags, ovlp, NULL);
rev->complete = 0;
ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSARecv ovlp: fd:%d rc:%d %ul of %z",
c->fd, rc, bytes, size);
if (rc == -1) {
err = ngx_socket_errno;
if (err == WSA_IO_PENDING) {
rev->active = 1;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"WSARecv() posted");
return NGX_AGAIN;
}
rev->error = 1;
ngx_connection_error(c, err, "WSARecv() failed");
return NGX_ERROR;
}
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 WSARecv() was already complete
*/
rev->active = 1;
return NGX_AGAIN;
}
rev->active = 0;
return bytes;
}
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