Win32: added WSAPoll() support.

WSAPoll() is only available with Windows Vista and newer (and only
available during compilation if _WIN32_WINNT >= 0x0600).  To make
sure the code works with Windows XP, we do not redefine _WIN32_WINNT,
but instead load WSAPoll() dynamically if it is not available during
compilation.

Also, sockets are not guaranteed to be small integers on Windows.
So an index array is used instead of NGX_USE_FD_EVENT to map
events to connections.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/os/win32/ngx_win32_init.c b/src/os/win32/ngx_win32_init.c
index ec9b51efa..70bee8ef4 100644
--- a/src/os/win32/ngx_win32_init.c
+++ b/src/os/win32/ngx_win32_init.c
@@ -58,6 +58,12 @@ static GUID cx_guid = WSAID_CONNECTEX;
 static GUID dx_guid = WSAID_DISCONNECTEX;
 
 
+#if (NGX_LOAD_WSAPOLL)
+ngx_wsapoll_pt             WSAPoll;
+ngx_uint_t                 ngx_have_wsapoll;
+#endif
+
+
 ngx_int_t
 ngx_os_init(ngx_log_t *log)
 {
@@ -223,6 +229,32 @@ ngx_os_init(ngx_log_t *log)
                       ngx_close_socket_n " failed");
     }
 
+#if (NGX_LOAD_WSAPOLL)
+    {
+    HMODULE  hmod;
+
+    hmod = GetModuleHandle("ws2_32.dll");
+    if (hmod == NULL) {
+        ngx_log_error(NGX_LOG_NOTICE, log, ngx_errno,
+                      "GetModuleHandle(\"ws2_32.dll\") failed");
+        goto nopoll;
+    }
+
+    WSAPoll = (ngx_wsapoll_pt) GetProcAddress(hmod, "WSAPoll");
+    if (WSAPoll == NULL) {
+        ngx_log_error(NGX_LOG_NOTICE, log, ngx_errno,
+                      "GetProcAddress(\"WSAPoll\") failed");
+        goto nopoll;
+    }
+
+    ngx_have_wsapoll = 1;
+
+    }
+
+nopoll:
+
+#endif
+
     if (GetEnvironmentVariable("ngx_unique", ngx_unique, NGX_INT32_LEN + 1)
         != 0)
     {