Add back libardour wrappers for PBD::SystemExec

Add back ARDOUR::SystemExec wrapper for PBD::SystemExec, and add
constructor for command line with parameter substitution.

libs/ardour/ardour/system_exec.h

@@ -0,0 +1,51 @@
+/*
+    Copyright (C) 2010 Paul Davis
+    Copyright (C) 2010-2014 Robin Gareus <robin@gareus.org>
+
+    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 2 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, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+#ifndef _ardour_system_exec_h_
+#define _ardour_system_exec_h_
+
+#include "ardour/libardour_visibility.h"
+#include "pbd/system_exec.h"
+
+namespace ARDOUR {
+
+class LIBARDOUR_API SystemExec
+	: public PBD::SystemExec
+{
+
+public:
+	SystemExec (std::string c, std::string a = "");
+	SystemExec (std::string c, char ** a);
+	SystemExec (std::string c, const std::map<char, std::string> subs);
+	~SystemExec ();
+
+	int start (int stderr_mode = 1) {
+		return PBD::SystemExec::start(stderr_mode, _vfork_exec_wrapper);
+	}
+
+private:
+	static char * _vfork_exec_wrapper;
+
+}; /* end class */
+
+}; /* end namespace */
+
+#endif /* _libpbd_system_exec_h_ */
+
+

libs/ardour/system_exec.cc

@@ -0,0 +1,78 @@
+/*
+    Copyright (C) 2010 Paul Davis
+    Copyright (C) 2010-2014 Robin Gareus <robin@gareus.org>
+
+    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 2 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, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <glibmm/miscutils.h>
+#include "pbd/pathscanner.h"
+#include "pbd/file_utils.h"
+#include "pbd/error.h"
+
+#include "ardour/filesystem_paths.h"
+#include "ardour/system_exec.h"
+
+using namespace ARDOUR;
+
+char * SystemExec::_vfork_exec_wrapper = NULL;
+
+static char *vfork_exec_wrapper_path() {
+#ifdef PLATFORM_WINDOWS
+	return NULL;
+#else
+	std::string vfork_exec_wrapper;
+	if (!PBD::find_file_in_search_path (
+				PBD::Searchpath(Glib::build_filename(ARDOUR::ardour_dll_directory(), "vfork")),
+				"ardour-exec-wrapper", vfork_exec_wrapper)) {
+		PBD::warning << "vfork exec wrapper not found..'" << endmsg;
+		return NULL;
+	}
+	return strdup(vfork_exec_wrapper.c_str());
+#endif
+}
+
+SystemExec::SystemExec (std::string c, char ** a)
+	: PBD::SystemExec(c, a)
+{
+#ifndef PLATFORM_WINDOWS
+	if (!_vfork_exec_wrapper) {
+		_vfork_exec_wrapper = vfork_exec_wrapper_path();
+	}
+#endif
+}
+
+SystemExec::SystemExec (std::string c, std::string a)
+	: PBD::SystemExec(c, a)
+{
+#ifndef PLATFORM_WINDOWS
+	if (!_vfork_exec_wrapper) {
+		_vfork_exec_wrapper = vfork_exec_wrapper_path();
+	}
+#endif
+}
+
+SystemExec::SystemExec (std::string c, const std::map<char, std::string> subs)
+	: PBD::SystemExec(c, subs)
+{
+#ifndef PLATFORM_WINDOWS
+	if (!_vfork_exec_wrapper) {
+		_vfork_exec_wrapper = vfork_exec_wrapper_path();
+	}
+#endif
+}
+
+SystemExec::~SystemExec() { }