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/*
 * Global variables for AppFS caching
 */
pthread_mutex_t appfs_path_info_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
int appfs_path_info_cache_size = 8209;
struct appfs_pathinfo *appfs_path_info_cache = NULL;














/*
 * Global variables for AppFS Tcl Interpreter restarting
 */
int interp_reset_key = 0;

/*
 * AppFS Path Type:  Describes the type of path a given file is
................................................................................

/*
 * Create a new Tcl interpreter and completely initialize it
 */
static Tcl_Interp *appfs_create_TclInterp(char **error_string) {
	Tcl_Interp *interp;
	int tcl_ret;


	APPFS_DEBUG("Creating new Tcl interpreter for TID = 0x%llx", (unsigned long long) pthread_self());


	interp = Tcl_CreateInterp();

	if (interp == NULL) {
		fprintf(stderr, "Unable to create Tcl Interpreter.  Aborting.\n");

		if (error_string) {
			*error_string = strdup("Unable to create Tcl interpreter.");
		}

		return(NULL);
	}

	Tcl_Preserve(interp);


	tcl_ret = Tcl_Init(interp);

	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl.  Aborting.\n");

		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));


		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

























		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}


	tcl_ret = Tcl_Eval(interp, "package ifneeded sha1 1.0 [list load {} sha1]");

	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl SHA1.  Aborting.\n");

		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));


		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	tcl_ret = Tcl_Eval(interp, "package ifneeded appfsd 1.0 [list load {} appfsd]");
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS Package.  Aborting.\n");
		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));

		if (error_string) {
			*error_string = strdup(Tcl_GetStringResult(interp));
		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	/*
	 * Load "pki.tcl" in the same way as appfsd.tcl (see below)
	 */

	tcl_ret = Tcl_Eval(interp, ""
#include "pki.tcl.h"
	"");

	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl PKI.  Aborting.\n");

		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));


		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	/*
	 * Load the "appfsd.tcl" script, which is "compiled" into a C header
	 * so that it does not need to exist on the filesystem and can be
	 * directly evaluated.
	 */

	tcl_ret = Tcl_Eval(interp, ""
#include "appfsd.tcl.h"
	"");

	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS script.  Aborting.\n");

		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));


		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	/*
	 * Set global variables from C to Tcl
	 */

	if (Tcl_SetVar(interp, "::appfs::cachedir", appfs_cachedir, TCL_GLOBAL_ONLY) == NULL) {


		fprintf(stderr, "Unable to set cache directory.  This should never fail.\n");

		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	/*
	 * Initialize the "appfsd.tcl" environment, which must be done after
	 * global variables are set.
	 */

	tcl_ret = Tcl_Eval(interp, "::appfs::init");

	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS script (::appfs::init).  Aborting.\n");

		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));


		if (error_string) {

			*error_string = strdup(Tcl_GetStringResult(interp));

		}

		Tcl_Release(interp);

		APPFS_DEBUG("Terminating Tcl interpreter.");

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	/*
	 * Hide some Tcl commands that we do not care to use and which may
	 * slow down run-time operations.
	 */

	Tcl_HideCommand(interp, "auto_load_index", "auto_load_index");
	Tcl_HideCommand(interp, "unknown", "unknown");
	Tcl_HideCommand(interp, "exit", "exit");


	/*
	 * Release the hold we have on the interpreter so that it may be
	 * deleted if needed
	 */
	Tcl_Release(interp);

	/*
	 * Return the completely initialized interpreter
	 */
	return(interp);
}

................................................................................

	global_interp_reset_key = __sync_fetch_and_add(&interp_reset_key, 0);

	interp = pthread_getspecific(interpKey);
	if (interp != NULL && thread_interp_reset_key != global_interp_reset_key) {
		APPFS_DEBUG("Terminating old interpreter and restarting due to reset request.");

		Tcl_DeleteInterp(interp);

		interp = NULL;

		pthread_ret = pthread_setspecific(interpKey, interp);
	}

	if (global_interp_reset_key == -1) {
................................................................................
			return(NULL);
		}

		pthread_ret = pthread_setspecific(interpKey, interp);
		if (pthread_ret != 0) {
			APPFS_DEBUG("pthread_setspecific() failed.  Terminating Tcl interpreter.");

			Tcl_DeleteInterp(interp);

			return(NULL);
		}
	}

	return(interp);
}
................................................................................

	if (interp == NULL) {
		return(TCL_ERROR);
	}

	objv = (void *) ckalloc(sizeof(*objv) * objc);


	objv[0] = Tcl_NewStringObj(cmd, -1);

	Tcl_IncrRefCount(objv[0]);

	va_start(argp, cmd);
	for (i = 1; i < objc; i++) {
		arg = va_arg(argp, const char *);

		objv[i] = Tcl_NewStringObj(arg, -1);

		Tcl_IncrRefCount(objv[i]);
	}
	va_end(argp);



	retval = Tcl_EvalObjv(interp, objc, objv, 0);



	for (i = 0; i < objc; i++) {
		Tcl_DecrRefCount(objv[i]);
	}


	ckfree((void *) objv);

	if (retval != TCL_OK) {

		APPFS_DEBUG("Tcl command failed, ::errorInfo contains: %s\n", Tcl_GetVar(interp, "::errorInfo", 0));

	}

	return(retval);
}

/*
 * Request all Tcl interpreters restart
................................................................................
	Tcl_Obj *attrs_dict, *attr_value;
	const char *attr_value_str;
	Tcl_WideInt attr_value_wide;
	int attr_value_int;
	static __thread Tcl_Obj *attr_key_type = NULL, *attr_key_perms = NULL, *attr_key_size = NULL, *attr_key_time = NULL, *attr_key_source = NULL, *attr_key_childcount = NULL, *attr_key_packaged = NULL;
	int cache_ret;
	int tcl_ret;

	uid_t fsuid;



	fsuid = appfs_get_fsuid();

	cache_ret = appfs_get_path_info_cache_get(path, fsuid, pathinfo);
	if (cache_ret == 0) {
		if (pathinfo->type == APPFS_PATHTYPE_DOES_NOT_EXIST) {
			return(-ENOENT);
................................................................................
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	Tcl_Preserve(interp);

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getattr", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::getattr(%s) failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		pathinfo->type = APPFS_PATHTYPE_DOES_NOT_EXIST;

		appfs_get_path_info_cache_add(path, fsuid, pathinfo);

		Tcl_Release(interp);

		return(-ENOENT);
	}

	if (attr_key_type == NULL) {

		attr_key_type       = Tcl_NewStringObj("type", -1);
		attr_key_perms      = Tcl_NewStringObj("perms", -1);
		attr_key_size       = Tcl_NewStringObj("size", -1);
		attr_key_time       = Tcl_NewStringObj("time", -1);
		attr_key_source     = Tcl_NewStringObj("source", -1);
		attr_key_childcount = Tcl_NewStringObj("childcount", -1);
		attr_key_packaged   = Tcl_NewStringObj("packaged", -1);
	}











	attrs_dict = Tcl_GetObjResult(interp);
	tcl_ret = Tcl_DictObjGet(interp, attrs_dict, attr_key_type, &attr_value);

	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("[dict get \"type\"] failed");

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(-EIO);
	}

	if (attr_value == NULL) {
		Tcl_Release(interp);

		return(-EIO);
	}

	pathinfo->packaged = 0;
	pathinfo->inode = appfs_get_path_inode(path);


	attr_value_str = Tcl_GetString(attr_value);

	switch (attr_value_str[0]) {
		case 'd': /* directory */
			pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
			pathinfo->typeinfo.dir.childcount = 0;

			Tcl_DictObjGet(interp, attrs_dict, attr_key_childcount, &attr_value);
			if (attr_value != NULL) {
				tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
				if (tcl_ret == TCL_OK) {
					pathinfo->typeinfo.dir.childcount = attr_value_wide;
				}
			}

			break;
		case 'f': /* file */
			pathinfo->type = APPFS_PATHTYPE_FILE;
			pathinfo->typeinfo.file.size = 0;
			pathinfo->typeinfo.file.executable = 0;

			Tcl_DictObjGet(interp, attrs_dict, attr_key_size, &attr_value);
			if (attr_value != NULL) {
				tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
				if (tcl_ret == TCL_OK) {
					pathinfo->typeinfo.file.size = attr_value_wide;
				}
			}

			Tcl_DictObjGet(interp, attrs_dict, attr_key_perms, &attr_value);
			if (attr_value != NULL) {
				attr_value_str = Tcl_GetString(attr_value);
				if (attr_value_str[0] == 'x') {
					pathinfo->typeinfo.file.executable = 1;
				}
			}
			break;
		case 's': /* symlink */
			pathinfo->type = APPFS_PATHTYPE_SYMLINK;
			pathinfo->typeinfo.symlink.size = 0;
			pathinfo->typeinfo.symlink.source[0] = '\0';

			Tcl_DictObjGet(interp, attrs_dict, attr_key_source, &attr_value);
			if (attr_value != NULL) {
				attr_value_str = Tcl_GetStringFromObj(attr_value, &attr_value_int); 

				if ((attr_value_int + 1) <= sizeof(pathinfo->typeinfo.symlink.source)) {
					pathinfo->typeinfo.symlink.size = attr_value_int;
					pathinfo->typeinfo.symlink.source[attr_value_int] = '\0';

					memcpy(pathinfo->typeinfo.symlink.source, attr_value_str, attr_value_int);
				}
			}
			break;
		case 'F': /* pipe/fifo */
			pathinfo->type = APPFS_PATHTYPE_FIFO;
			break;
		case 'S': /* UNIX domain socket */
			pathinfo->type = APPFS_PATHTYPE_SOCKET;
			break;
		default:
			Tcl_Release(interp);


			return(-EIO);
	}

	Tcl_DictObjGet(interp, attrs_dict, attr_key_packaged, &attr_value);
	if (attr_value != NULL) {
		pathinfo->packaged = 1;
	}

	Tcl_DictObjGet(interp, attrs_dict, attr_key_time, &attr_value);
	if (attr_value != NULL) {
		tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
		if (tcl_ret == TCL_OK) {
			pathinfo->time = attr_value_wide;
		}
	} else {
		pathinfo->time = 0;
	}

	Tcl_Release(interp);



	appfs_get_path_info_cache_add(path, fsuid, pathinfo);


	return(0);
}

static char *appfs_prepare_to_create(const char *path) {
	Tcl_Interp *interp;
	const char *real_path;
	int tcl_ret;

................................................................................
	appfs_get_path_info_cache_flush(appfs_get_fsuid(), -1);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(NULL);
	}

	Tcl_Preserve(interp);


	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::prepare_to_create", path);

	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::prepare_to_create(%s) failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(NULL);
	}


	real_path = Tcl_GetStringResult(interp);


	Tcl_Release(interp);

	if (real_path == NULL) {
		return(NULL);
	}

	return(strdup(real_path));
}
................................................................................
	int tcl_ret;

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(NULL);
	}

	Tcl_Preserve(interp);


	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::localpath", path);

	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::localpath(%s) failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		return(NULL);
	}


	real_path = Tcl_GetStringResult(interp);


	Tcl_Release(interp);

	if (real_path == NULL) {
		return(NULL);
	}

	return(strdup(real_path));
}
................................................................................
	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(0);
	}

	Tcl_Preserve(interp);

	filler(buf, ".", NULL, 0);
	filler(buf, "..", NULL, 0);

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getchildren", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::getchildren(%s) failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(0);
	}


	tcl_ret = Tcl_ListObjGetElements(interp, Tcl_GetObjResult(interp), &children_count, &children);

	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("Parsing list of children on path %s failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(0);
	}

	for (idx = 0; idx < children_count; idx++) {

		filler(buf, Tcl_GetString(children[idx]), NULL, 0);

	}

	Tcl_Release(interp);

	return(0);
}

static int appfs_fuse_open(const char *path, struct fuse_file_info *fi) {
	Tcl_Interp *interp;
	struct appfs_pathinfo pathinfo;
................................................................................
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	Tcl_Preserve(interp);

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, mode);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, mode);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(-EIO);
	}


	real_path = Tcl_GetStringResult(interp);


	Tcl_Release(interp);

	if (real_path == NULL) {
		return(-EIO);
	}

	APPFS_DEBUG("Translated request to open %s to opening %s (mode = \"%s\")", path, real_path, mode);

................................................................................
	if (interp == NULL) {
		return(-EIO);
	}

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::unlinkpath(%s) failed.", path);

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(-EIO);
	}

	Tcl_Release(interp);

	return(0);
}

static int appfs_fuse_mkdir(const char *path, mode_t mode) {
	char *real_path;
	int mkdir_ret;
................................................................................
	appfs_get_path_info_cache_rm(path, appfs_get_fsuid());

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	Tcl_Preserve(interp);

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, "write");
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, "write");

		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));


		Tcl_Release(interp);

		return(-EIO);
	}


	real_path = Tcl_GetStringResult(interp);


	Tcl_Release(interp);

	if (real_path == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

................................................................................
                return(TCL_ERROR);
        }

	fsuid = appfs_get_fsuid();

	if (fsuid == last_fsuid && last_homedir_obj != NULL) {
		homedir_obj = last_homedir_obj;


	} else {
		homedir = appfs_get_homedir(appfs_get_fsuid());

		if (homedir == NULL) {
			return(TCL_ERROR);
		}

		homedir_obj = Tcl_NewStringObj(homedir, -1);

		free(homedir);



		if (last_homedir_obj != NULL) {
			Tcl_DecrRefCount(last_homedir_obj);
		}

		last_homedir_obj = homedir_obj;
		last_fsuid = fsuid;

		Tcl_IncrRefCount(last_homedir_obj);
	}

       	Tcl_SetObjResult(interp, homedir_obj);



        return(TCL_OK);
}

static int tcl_appfs_simulate_user_fs_enter(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	appfs_simulate_user_fs_enter();

................................................................................
		return;
	}

	interp = _interp;

	APPFS_DEBUG("Terminating interpreter due to thread termination");


	Tcl_DeleteInterp(interp);


	return;
}

/*
 * FUSE operations structure
 */
................................................................................
		}

		fprintf(stderr, "Unable to initialize Tcl interpreter for AppFSd:\n");
		fprintf(stderr, "%s\n", test_interp_error);

		return(1);
	}

	Tcl_DeleteInterp(test_interp);

	Tcl_FinalizeNotifier(NULL);

	/*
	 * Register a signal handler for hot-restart requests
	 */
	signal_ret = signal(SIGHUP, appfs_signal_handler);
	if (signal_ret == SIG_ERR) {







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/*
 * Global variables for AppFS caching
 */
pthread_mutex_t appfs_path_info_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
int appfs_path_info_cache_size = 8209;
struct appfs_pathinfo *appfs_path_info_cache = NULL;

#ifndef TCL_THREADS
/*
 * Handle unthreaded Tcl
 */
pthread_mutex_t appfs_tcl_big_global_lock = PTHREAD_MUTEX_INITIALIZER;
#define appfs_call_libtcl_enter pthread_mutex_lock(&appfs_tcl_big_global_lock);
#define appfs_call_libtcl_exit pthread_mutex_unlock(&appfs_tcl_big_global_lock);
#else
#define appfs_call_libtcl_enter /**/
#define appfs_call_libtcl_exit /**/
#endif
#define appfs_call_libtcl(x...) appfs_call_libtcl_enter x appfs_call_libtcl_exit

/*
 * Global variables for AppFS Tcl Interpreter restarting
 */
int interp_reset_key = 0;

/*
 * AppFS Path Type:  Describes the type of path a given file is
................................................................................

/*
 * Create a new Tcl interpreter and completely initialize it
 */
static Tcl_Interp *appfs_create_TclInterp(char **error_string) {
	Tcl_Interp *interp;
	int tcl_ret;
	const char *tcl_setvar_ret;

	APPFS_DEBUG("Creating new Tcl interpreter for TID = 0x%llx", (unsigned long long) pthread_self());

	appfs_call_libtcl(
		interp = Tcl_CreateInterp();
	)
	if (interp == NULL) {
		fprintf(stderr, "Unable to create Tcl Interpreter.  Aborting.\n");

		if (error_string) {
			*error_string = strdup("Unable to create Tcl interpreter.");
		}

		return(NULL);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	appfs_call_libtcl(
		tcl_ret = Tcl_Init(interp);
	)
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl.  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	appfs_call_libtcl(
		tcl_ret = Tcl_Eval(interp, "package ifneeded sha1 1.0 [list load {} sha1]");
	)
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl SHA1.  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	appfs_call_libtcl(
		tcl_ret = Tcl_Eval(interp, "package ifneeded appfsd 1.0 [list load {} appfsd]");
	)
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS Package.  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)



















		return(NULL);
	}

	/*
	 * Load "pki.tcl" in the same way as appfsd.tcl (see below)
	 */
	appfs_call_libtcl_enter
		tcl_ret = Tcl_Eval(interp, ""
#include "pki.tcl.h"
		"");
	appfs_call_libtcl_exit
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl PKI.  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	/*
	 * Load the "appfsd.tcl" script, which is "compiled" into a C header
	 * so that it does not need to exist on the filesystem and can be
	 * directly evaluated.
	 */
	appfs_call_libtcl_enter
		tcl_ret = Tcl_Eval(interp, ""
#include "appfsd.tcl.h"
		"");
	appfs_call_libtcl_exit
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS script.  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	/*
	 * Set global variables from C to Tcl
	 */
	appfs_call_libtcl(
		tcl_setvar_ret = Tcl_SetVar(interp, "::appfs::cachedir", appfs_cachedir, TCL_GLOBAL_ONLY);
	)
	if (tcl_setvar_ret == NULL) {
		fprintf(stderr, "Unable to set cache directory.  This should never fail.\n");

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	/*
	 * Initialize the "appfsd.tcl" environment, which must be done after
	 * global variables are set.
	 */
	appfs_call_libtcl(
		tcl_ret = Tcl_Eval(interp, "::appfs::init");
	)
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS script (::appfs::init).  Aborting.\n");
		appfs_call_libtcl(
			fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
		)

		if (error_string) {
			appfs_call_libtcl(
				*error_string = strdup(Tcl_GetStringResult(interp));
			)
		}

		appfs_call_libtcl(Tcl_Release(interp);)

		APPFS_DEBUG("Terminating Tcl interpreter.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		return(NULL);
	}

	/*
	 * Hide some Tcl commands that we do not care to use and which may
	 * slow down run-time operations.
	 */
	appfs_call_libtcl(
		Tcl_HideCommand(interp, "auto_load_index", "auto_load_index");
		Tcl_HideCommand(interp, "unknown", "unknown");
		Tcl_HideCommand(interp, "exit", "exit");
	)

	/*
	 * Release the hold we have on the interpreter so that it may be
	 * deleted if needed
	 */
	appfs_call_libtcl(Tcl_Release(interp);)

	/*
	 * Return the completely initialized interpreter
	 */
	return(interp);
}

................................................................................

	global_interp_reset_key = __sync_fetch_and_add(&interp_reset_key, 0);

	interp = pthread_getspecific(interpKey);
	if (interp != NULL && thread_interp_reset_key != global_interp_reset_key) {
		APPFS_DEBUG("Terminating old interpreter and restarting due to reset request.");

		appfs_call_libtcl(Tcl_DeleteInterp(interp);)

		interp = NULL;

		pthread_ret = pthread_setspecific(interpKey, interp);
	}

	if (global_interp_reset_key == -1) {
................................................................................
			return(NULL);
		}

		pthread_ret = pthread_setspecific(interpKey, interp);
		if (pthread_ret != 0) {
			APPFS_DEBUG("pthread_setspecific() failed.  Terminating Tcl interpreter.");

			appfs_call_libtcl(Tcl_DeleteInterp(interp);)

			return(NULL);
		}
	}

	return(interp);
}
................................................................................

	if (interp == NULL) {
		return(TCL_ERROR);
	}

	objv = (void *) ckalloc(sizeof(*objv) * objc);

	appfs_call_libtcl(
		objv[0] = Tcl_NewStringObj(cmd, -1);

		Tcl_IncrRefCount(objv[0]);

		va_start(argp, cmd);
		for (i = 1; i < objc; i++) {
			arg = va_arg(argp, const char *);

			objv[i] = Tcl_NewStringObj(arg, -1);

			Tcl_IncrRefCount(objv[i]);
		}
		va_end(argp);
	)

	appfs_call_libtcl(
		retval = Tcl_EvalObjv(interp, objc, objv, 0);
	)

	appfs_call_libtcl(
		for (i = 0; i < objc; i++) {
			Tcl_DecrRefCount(objv[i]);
		}
	)

	ckfree((void *) objv);

	if (retval != TCL_OK) {
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl command failed, ::errorInfo contains: %s\n", Tcl_GetVar(interp, "::errorInfo", 0));
		)
	}

	return(retval);
}

/*
 * Request all Tcl interpreters restart
................................................................................
	Tcl_Obj *attrs_dict, *attr_value;
	const char *attr_value_str;
	Tcl_WideInt attr_value_wide;
	int attr_value_int;
	static __thread Tcl_Obj *attr_key_type = NULL, *attr_key_perms = NULL, *attr_key_size = NULL, *attr_key_time = NULL, *attr_key_source = NULL, *attr_key_childcount = NULL, *attr_key_packaged = NULL;
	int cache_ret;
	int tcl_ret;
	int retval;
	uid_t fsuid;

	retval = 0;

	fsuid = appfs_get_fsuid();

	cache_ret = appfs_get_path_info_cache_get(path, fsuid, pathinfo);
	if (cache_ret == 0) {
		if (pathinfo->type == APPFS_PATHTYPE_DOES_NOT_EXIST) {
			return(-ENOENT);
................................................................................
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getattr", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::getattr(%s) failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		pathinfo->type = APPFS_PATHTYPE_DOES_NOT_EXIST;

		appfs_get_path_info_cache_add(path, fsuid, pathinfo);

		appfs_call_libtcl(Tcl_Release(interp);)

		return(-ENOENT);
	}

	if (attr_key_type == NULL) {
		appfs_call_libtcl(
			attr_key_type       = Tcl_NewStringObj("type", -1);
			attr_key_perms      = Tcl_NewStringObj("perms", -1);
			attr_key_size       = Tcl_NewStringObj("size", -1);
			attr_key_time       = Tcl_NewStringObj("time", -1);
			attr_key_source     = Tcl_NewStringObj("source", -1);
			attr_key_childcount = Tcl_NewStringObj("childcount", -1);
			attr_key_packaged   = Tcl_NewStringObj("packaged", -1);

			Tcl_IncrRefCount(attr_key_type);
			Tcl_IncrRefCount(attr_key_perms);
			Tcl_IncrRefCount(attr_key_size);
			Tcl_IncrRefCount(attr_key_time);
			Tcl_IncrRefCount(attr_key_source);
			Tcl_IncrRefCount(attr_key_childcount);
			Tcl_IncrRefCount(attr_key_packaged);
		)
	}

	appfs_call_libtcl(
		attrs_dict = Tcl_GetObjResult(interp);
		tcl_ret = Tcl_DictObjGet(interp, attrs_dict, attr_key_type, &attr_value);
	)
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("[dict get \"type\"] failed");
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(-EIO);
	}

	if (attr_value == NULL) {
		appfs_call_libtcl(Tcl_Release(interp);)

		return(-EIO);
	}

	pathinfo->packaged = 0;
	pathinfo->inode = appfs_get_path_inode(path);

	appfs_call_libtcl(
		attr_value_str = Tcl_GetString(attr_value);

		switch (attr_value_str[0]) {
			case 'd': /* directory */
				pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
				pathinfo->typeinfo.dir.childcount = 0;

				Tcl_DictObjGet(interp, attrs_dict, attr_key_childcount, &attr_value);
				if (attr_value != NULL) {
					tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
					if (tcl_ret == TCL_OK) {
						pathinfo->typeinfo.dir.childcount = attr_value_wide;
					}
				}

				break;
			case 'f': /* file */
				pathinfo->type = APPFS_PATHTYPE_FILE;
				pathinfo->typeinfo.file.size = 0;
				pathinfo->typeinfo.file.executable = 0;

				Tcl_DictObjGet(interp, attrs_dict, attr_key_size, &attr_value);
				if (attr_value != NULL) {
					tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
					if (tcl_ret == TCL_OK) {
						pathinfo->typeinfo.file.size = attr_value_wide;
					}
				}

				Tcl_DictObjGet(interp, attrs_dict, attr_key_perms, &attr_value);
				if (attr_value != NULL) {
					attr_value_str = Tcl_GetString(attr_value);
					if (attr_value_str[0] == 'x') {
						pathinfo->typeinfo.file.executable = 1;
					}
				}
				break;
			case 's': /* symlink */
				pathinfo->type = APPFS_PATHTYPE_SYMLINK;
				pathinfo->typeinfo.symlink.size = 0;
				pathinfo->typeinfo.symlink.source[0] = '\0';

				Tcl_DictObjGet(interp, attrs_dict, attr_key_source, &attr_value);
				if (attr_value != NULL) {
					attr_value_str = Tcl_GetStringFromObj(attr_value, &attr_value_int); 

					if ((attr_value_int + 1) <= sizeof(pathinfo->typeinfo.symlink.source)) {
						pathinfo->typeinfo.symlink.size = attr_value_int;
						pathinfo->typeinfo.symlink.source[attr_value_int] = '\0';

						memcpy(pathinfo->typeinfo.symlink.source, attr_value_str, attr_value_int);
					}
				}
				break;
			case 'F': /* pipe/fifo */
				pathinfo->type = APPFS_PATHTYPE_FIFO;
				break;
			case 'S': /* UNIX domain socket */
				pathinfo->type = APPFS_PATHTYPE_SOCKET;
				break;
			default:

				retval = -EIO;
		}



		Tcl_DictObjGet(interp, attrs_dict, attr_key_packaged, &attr_value);
		if (attr_value != NULL) {
			pathinfo->packaged = 1;
		}

		Tcl_DictObjGet(interp, attrs_dict, attr_key_time, &attr_value);
		if (attr_value != NULL) {
			tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
			if (tcl_ret == TCL_OK) {
				pathinfo->time = attr_value_wide;
			}
		} else {
			pathinfo->time = 0;
		}

		Tcl_Release(interp);
	)

	if (retval == 0) {
		appfs_get_path_info_cache_add(path, fsuid, pathinfo);
	}

	return(retval);
}

static char *appfs_prepare_to_create(const char *path) {
	Tcl_Interp *interp;
	const char *real_path;
	int tcl_ret;

................................................................................
	appfs_get_path_info_cache_flush(appfs_get_fsuid(), -1);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(NULL);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	appfs_call_libtcl(
		tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::prepare_to_create", path);
	)
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::prepare_to_create(%s) failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(NULL);
	}

	appfs_call_libtcl(
		real_path = Tcl_GetStringResult(interp);
	)

	appfs_call_libtcl(Tcl_Release(interp);)

	if (real_path == NULL) {
		return(NULL);
	}

	return(strdup(real_path));
}
................................................................................
	int tcl_ret;

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(NULL);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	appfs_call_libtcl(
		tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::localpath", path);
	)
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::localpath(%s) failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		return(NULL);
	}

	appfs_call_libtcl(
		real_path = Tcl_GetStringResult(interp);
	)

	appfs_call_libtcl(Tcl_Release(interp);)

	if (real_path == NULL) {
		return(NULL);
	}

	return(strdup(real_path));
}
................................................................................
	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(0);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	filler(buf, ".", NULL, 0);
	filler(buf, "..", NULL, 0);

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getchildren", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::getchildren(%s) failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(0);
	}

	appfs_call_libtcl(
		tcl_ret = Tcl_ListObjGetElements(interp, Tcl_GetObjResult(interp), &children_count, &children);
	)
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("Parsing list of children on path %s failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(0);
	}

	for (idx = 0; idx < children_count; idx++) {
		appfs_call_libtcl(
			filler(buf, Tcl_GetString(children[idx]), NULL, 0);
		)
	}

	appfs_call_libtcl(Tcl_Release(interp);)

	return(0);
}

static int appfs_fuse_open(const char *path, struct fuse_file_info *fi) {
	Tcl_Interp *interp;
	struct appfs_pathinfo pathinfo;
................................................................................
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, mode);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, mode);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(-EIO);
	}

	appfs_call_libtcl(
		real_path = Tcl_GetStringResult(interp);
	)

	appfs_call_libtcl(Tcl_Release(interp);)

	if (real_path == NULL) {
		return(-EIO);
	}

	APPFS_DEBUG("Translated request to open %s to opening %s (mode = \"%s\")", path, real_path, mode);

................................................................................
	if (interp == NULL) {
		return(-EIO);
	}

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::unlinkpath(%s) failed.", path);
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(-EIO);
	}

	appfs_call_libtcl(Tcl_Release(interp);)

	return(0);
}

static int appfs_fuse_mkdir(const char *path, mode_t mode) {
	char *real_path;
	int mkdir_ret;
................................................................................
	appfs_get_path_info_cache_rm(path, appfs_get_fsuid());

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_call_libtcl(Tcl_Preserve(interp);)

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, "write");
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, "write");
		appfs_call_libtcl(
			APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));
		)

		appfs_call_libtcl(Tcl_Release(interp);)

		return(-EIO);
	}

	appfs_call_libtcl(
		real_path = Tcl_GetStringResult(interp);
	)

	appfs_call_libtcl(Tcl_Release(interp);)

	if (real_path == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

................................................................................
                return(TCL_ERROR);
        }

	fsuid = appfs_get_fsuid();

	if (fsuid == last_fsuid && last_homedir_obj != NULL) {
		homedir_obj = last_homedir_obj;

		Tcl_IncrRefCount(homedir_obj);
	} else {
		homedir = appfs_get_homedir(appfs_get_fsuid());

		if (homedir == NULL) {
			return(TCL_ERROR);
		}

		homedir_obj = Tcl_NewStringObj(homedir, -1);

		free(homedir);

		Tcl_IncrRefCount(homedir_obj);

		if (last_homedir_obj != NULL) {
			Tcl_DecrRefCount(last_homedir_obj);
		}

		last_homedir_obj = homedir_obj;
		last_fsuid = fsuid;

		Tcl_IncrRefCount(homedir_obj);
	}

       	Tcl_SetObjResult(interp, homedir_obj);

	Tcl_DecrRefCount(homedir_obj);

        return(TCL_OK);
}

static int tcl_appfs_simulate_user_fs_enter(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	appfs_simulate_user_fs_enter();

................................................................................
		return;
	}

	interp = _interp;

	APPFS_DEBUG("Terminating interpreter due to thread termination");

	appfs_call_libtcl(
		Tcl_DeleteInterp(interp);
	)

	return;
}

/*
 * FUSE operations structure
 */
................................................................................
		}

		fprintf(stderr, "Unable to initialize Tcl interpreter for AppFSd:\n");
		fprintf(stderr, "%s\n", test_interp_error);

		return(1);
	}

	Tcl_DeleteInterp(test_interp);

	Tcl_FinalizeNotifier(NULL);

	/*
	 * Register a signal handler for hot-restart requests
	 */
	signal_ret = signal(SIGHUP, appfs_signal_handler);
	if (signal_ret == SIG_ERR) {