Mercurial > hg > nginx-quic
view src/os/win32/ngx_wsarecv.c @ 8437:d5f93733c17d quic
QUIC: relaxed client id requirements.
Client IDs cannot be reused on different paths. This change allows to reuse
client id previosly seen on the same path (but with different dcid) in case
when no unused client IDs are available.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Wed, 05 May 2021 18:11:55 +0300 |
parents | efd71d49bde0 |
children | 56819a9491fe |
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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_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_int_t n; 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; } n = ngx_connection_error(c, err, "WSARecv() failed"); if (n == NGX_ERROR) { rev->error = 1; } return n; } #if (NGX_HAVE_FIONREAD) if (rev->available >= 0 && bytes > 0) { rev->available -= bytes; /* * negative rev->available means some additional bytes * were received between kernel notification and WSARecv(), * and therefore ev->ready can be safely reset even for * edge-triggered event methods */ if (rev->available < 0) { rev->available = 0; rev->ready = 0; } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "WSARecv: avail:%d", rev->available); } else if (bytes == size) { if (ngx_socket_nread(c->fd, &rev->available) == -1) { n = ngx_connection_error(c, ngx_socket_errno, ngx_socket_nread_n " failed"); if (n == NGX_ERROR) { rev->error = 1; } return n; } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "WSARecv: avail:%d", rev->available); } #endif if (bytes < size) { rev->ready = 0; } if (bytes == 0) { rev->eof = 1; } return bytes; } ssize_t ngx_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_int_t n; 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; } n = ngx_connection_error(c, err, "WSARecv() failed"); if (n == NGX_ERROR) { rev->error = 1; } return n; } 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; } if (bytes == 0) { rev->eof = 1; rev->ready = 0; } else { rev->ready = 1; } rev->active = 0; return bytes; }