From cfc59b1713a9d9fc9a7e6f51952d2b584a3842e4 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Tue, 5 Jul 2016 02:14:54 -0400
Subject: driver: added native console accessor table.

---
 src/driver/ptyc_driver_ctx.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'src/driver')

diff --git a/src/driver/ptyc_driver_ctx.c b/src/driver/ptyc_driver_ctx.c
index cc50e36..78ffb54 100644
--- a/src/driver/ptyc_driver_ctx.c
+++ b/src/driver/ptyc_driver_ctx.c
@@ -4,7 +4,10 @@
 /*  Released under GPLv2 and GPLv3; see COPYING.PTYCON.  */
 /*********************************************************/
 
+#include <ntcon/ntcon.h>
 #include <ntapi/ntapi.h>
+#include <ntapi/nt_atomic.h>
+
 #include <stdint.h>
 
 #include <ptycon/ptycon.h>
@@ -20,6 +23,10 @@
 /* ntapi accessor table */
 const ntapi_vtbl * ptyc_ntapi;
 
+/* ntcon accessor table */
+static ntcon_vtbl ptyc_ntcon_vtbl;
+const  ntcon_vtbl * const ptyc_ntcon = &ptyc_ntcon_vtbl;
+
 /* package info */
 static const struct ptyc_source_version ptyc_src_version = {
 	PTYC_TAG_VER_MAJOR,
@@ -35,6 +42,43 @@ struct ptyc_driver_ctx_alloc {
 	const char *			units[];
 };
 
+static int32_t ptyc_ntcon_once = 0;
+
+static int32_t ptyc_ntcon_init(void)
+{
+	int32_t		status;
+	nt_timeout	timeout;
+
+	switch (at_locked_cas_32(&ptyc_ntcon_once,0,1)) {
+		case 0:
+			if ((status = ntcon_vtbl_init(&ptyc_ntcon_vtbl))) {
+				at_locked_add_32(&ptyc_ntcon_once,2);
+				return status;
+			} else {
+				at_locked_inc_32(&ptyc_ntcon_once);
+				return 0;
+			}
+
+		case 1:
+			timeout.quad = -10;
+
+			for (; (at_locked_cas_32(&ptyc_ntcon_once,0,1) == 1); )
+				ntapi->zw_delay_execution(
+					NT_SYNC_ALERTABLE,
+					&timeout);
+
+			return (ptyc_ntcon_once == 2)
+				? 0 : -1;
+
+		case 2:
+			return 0;
+
+		case 3:
+		default:
+			return -1;
+	}
+}
+
 static uint32_t ptyc_argv_flags(uint32_t flags)
 {
 	uint32_t ret = 0;
@@ -122,6 +166,9 @@ int ptyc_get_driver_ctx(
 	if (ptyc_init())
 		return -1;
 
+	if (ptyc_ntcon_init())
+		return -1;
+
 	options = ptyc_default_options;
 
 	if (!(meta = argv_get(argv,options,ptyc_argv_flags(flags))))
@@ -172,6 +219,9 @@ int ptyc_create_driver_ctx(
 	if (ptyc_init())
 		return -1;
 
+	if (ptyc_ntcon_init())
+		return -1;
+
 	if (!(meta = argv_get(argv,ptyc_default_options,0)))
 		return -1;
 
-- 
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