openocd: fix issue in WIN32 with TCP adapters

Issue: server_quit is called before adapter_quit:
  In WIN32 only in server_quit we do an WSACleanup,
  which terminates/closes all active sockets.
  So if the adapter is TCP based, the adapter.quit handler
  will fail if it will need to send some commands through TCP.

Example: close_socket in jtag_vpi_quit will fail in WIN32
  because the socket is already closed
  and the errno is set as "Bad File Descriptor"

To fix that we introduced new functions called server_host_os_entry/quit
to manage specific OS setup (hence WSA for sockets in WINDOWS) in order
to delay WSACleanup after adapter_quit().

Change-Id: Ie4afacafe123857f6ae300e376bdfcf0d8c027ac
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/5456
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/openocd.c

@@ -345,6 +345,8 @@ int openocd_main(int argc, char *argv[])
 	command_context_mode(cmd_ctx, COMMAND_CONFIG);
 	command_set_output_handler(cmd_ctx, configuration_output_handler, NULL);
 
+	server_host_os_entry();
+
 	/* Start the executable meat that can evolve into thread in future. */
 	ret = openocd_thread(argc, argv, cmd_ctx);
 
@@ -360,6 +362,8 @@ int openocd_main(int argc, char *argv[])
 
 	adapter_quit();
 
+	server_host_os_close();
+
 	/* Shutdown commandline interface */
 	command_exit(cmd_ctx);
 

src/server/server.c

@@ -631,7 +631,7 @@ static void sigkey_handler(int sig)
 #endif
 
 
-int server_preinit(void)
+int server_host_os_entry(void)
 {
 	/* this currently only calls WSAStartup on native win32 systems
 	 * before any socket operations are performed.
@@ -647,7 +647,21 @@ int server_preinit(void)
 		LOG_ERROR("Failed to Open Winsock");
 		return ERROR_FAIL;
 	}
+#endif
+	return ERROR_OK;
+}
 
+int server_host_os_close(void)
+{
+#ifdef _WIN32
+	WSACleanup();
+#endif
+	return ERROR_OK;
+}
+
+int server_preinit(void)
+{
+#ifdef _WIN32
 	/* register ctrl-c handler */
 	SetConsoleCtrlHandler(ControlHandler, TRUE);
 
@@ -688,7 +702,6 @@ int server_quit(void)
 	target_quit();
 
 #ifdef _WIN32
-	WSACleanup();
 	SetConsoleCtrlHandler(ControlHandler, FALSE);
 
 	return ERROR_OK;

src/server/server.h

@@ -80,6 +80,9 @@ int add_service(char *name, const char *port,
 		void *priv);
 int remove_service(const char *name, const char *port);
 
+int server_host_os_entry(void);
+int server_host_os_close(void);
+
 int server_preinit(void);
 int server_init(struct command_context *cmd_ctx);
 int server_quit(void);