videotools Code

--- a
+++ b/src/main/socket.cpp
@@ -0,0 +1,93 @@
+//
+// Copyright (C) 2017 Graeme Walker
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+// ===
+//
+// socket.cpp
+//
+// Sends a command string to a local-domain or UDP socket. 
+//
+// This can be used with the `vt-fileplayer` and `vt-recorder` programs when using 
+// their `--command-socket` option.
+//
+// The socket is a local-domain socket by default, but a UDP network socket 
+// if the socket name looks like a transport address or if it starts 
+// with `udp://`.
+// 
+// The standard "netcat" utility (`nc`) can also be used to send messages to
+// UDP and local-domain sockets.
+//
+// usage: socket <socket> <command-word> [<command-word> ...]
+//
+
+#include "gdef.h"
+#include "gnet.h"
+#include "gvstartup.h"
+#include "gvexit.h"
+#include "gvcommandsocket.h"
+#include "garg.h"
+#include "ggetopt.h"
+#include <string>
+#include <iostream>
+#include <stdexcept>
+
+int main( int argc , char * argv [] )
+{
+	try
+	{
+		G::Arg arg( argc , argv ) ;
+		G::GetOpt opt( arg , 
+			"V!version!show the program version and exit!!0!!3" "|"
+			"h!help!show this help!!0!!3" "|"
+		) ;
+		std::string args_help = "<socket> <command-word> [<command-word> ...]" ;
+		Gv::Startup startup( opt , args_help , opt.args().c() > 2U ) ;
+		try
+		{
+			std::string socket_path( opt.args().v(1) ) ;
+
+			std::string command ;
+			const char * sep = "" ;
+			for( unsigned int i = 2 ; i < opt.args().c() ; i++ , sep = " " )
+			{
+				command.append( sep ) ;
+				command.append( opt.args().v(i) ) ;
+			}
+
+			Gv::CommandSocket socket ;
+			socket.connect( socket_path ) ;
+			ssize_t n = ::send( socket.fd() , command.data() , command.size() , 0 ) ;
+			if( n != static_cast<ssize_t>(command.size()) )
+				throw std::runtime_error( "send failed" ) ;
+		}
+		catch( std::exception & e )
+		{
+			startup.report( arg.prefix() , e ) ;
+			throw ;
+		}
+		return EXIT_SUCCESS ;
+	}
+	catch( Gv::Exit & e )
+	{
+		return e.value() ;
+	}
+	catch( std::exception & e )
+	{
+		std::cerr << G::Arg::prefix(argv) << ": error: " << e.what() << std::endl ;
+	}
+	return EXIT_FAILURE ;
+}
+
+/// \file socket.cpp