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Comment:Improved server mode to register all of //xvfs:/
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SHA3-256: f1d16a395838a54ef57088a86c2d4a0542a41ea79a1904067f6f0e8c54f68e69
User & Date: rkeene on 2019-09-17 01:53:07
Other Links: manifest | tags
Context
2019-09-17
01:55
xvfs_perror -> xvfs_strerror, which is what it should have been named check-in: cf56967f97 user: rkeene tags: trunk
01:53
Improved server mode to register all of //xvfs:/ check-in: f1d16a3958 user: rkeene tags: trunk
2019-09-16
22:22
First implementation of the Server mode of XVFS check-in: 0e05b2a8c7 user: rkeene tags: trunk
Changes
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Modified Makefile from [d1e12905cd] to [ba72f8ca71].

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example.o: example.c xvfs-core.h xvfs-core.c Makefile
	$(CC) $(CPPFLAGS) -DXVFS_MODE_FLEXIBLE $(CFLAGS) -o example.o -c example.c

example.so: example.o Makefile
	$(CC) $(CFLAGS) $(LDFLAGS) -shared -o example.so example.o $(LIBS)

example-client.o: example.c xvfs-core.h Makefile
	$(CC) $(CPPFLAGS) -DXVFS_MODE_CLIENT $(CFLAGS) -o example-client.o -c example.c
	$(CC) $(CPPFLAGS) -DXVFS_MODE_FLEXIBLE $(CFLAGS) -o example-client.o -c example.c

example-server.o: xvfs-core.h xvfs-core.c Makefile
	$(CC) $(CPPFLAGS) -DXVFS_MODE_SERVER $(CFLAGS) -o example-server.o -c xvfs-core.c

example-client-server.so: example-client.o example-server.o Makefile
	$(CC) $(CFLAGS) $(LDFLAGS) -shared -o example-client-server.so example-client.o example-server.o $(LIBS)
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Modified xvfs-core.c from [15909aa1a5] to [9a0cfd6536].

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	path = xvfs_absolutePath(path);

	pathStr = xvfs_relativePath(path, instanceInfo);

	retval = instanceInfo->fsInfo->getStatProc(pathStr, statBuf);
	if (retval < 0) {
		XVFS_DEBUG_PRINTF("... failed: %s", xvfs_perror(retval));

		Tcl_SetErrno(xvfs_errorToErrno(retval));

		retval = -1;
	} else {
		XVFS_DEBUG_PUTS("... ok");
	}

	Tcl_DecrRefCount(path);
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#if defined(XVFS_MODE_FLEXIBLE)
static int xvfs_flexible_register(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) {
	ClientData fsHandlerDataRaw;
	struct xvfs_tclfs_server_info *fsHandlerData;
	const Tcl_Filesystem *fsHandler;
	int (*xvfs_register)(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo);
	Tcl_Obj *rootPathObj;

	XVFS_DEBUG_ENTER;

	xvfs_register = &xvfs_standalone_register;

	rootPathObj = Tcl_NewStringObj(XVFS_ROOT_MOUNTPOINT, -1);
	if (!rootPathObj) {
		XVFS_DEBUG_LEAVE;

		return(xvfs_register(interp, fsInfo));
	}

	Tcl_IncrRefCount(rootPathObj);
	fsHandler = Tcl_FSGetFileSystemForPath(rootPathObj);
	Tcl_DecrRefCount(rootPathObj);

	if (!fsHandler) {
		XVFS_DEBUG_LEAVE;

		return(xvfs_register(interp, fsInfo));
	}

	fsHandlerDataRaw = Tcl_FSData(fsHandler);
	if (!fsHandlerDataRaw) {
		XVFS_DEBUG_LEAVE;

		return(xvfs_register(interp, fsInfo));
	}

	fsHandlerData = (struct xvfs_tclfs_server_info *) fsHandlerDataRaw;

	/*
	 * XXX:TODO: What is the chance that the handler for //xvfs:/ hold
	 * client data smaller than XVFS_INTERNAL_SERVER_MAGIC_LEN ?
	 */
	if (memcmp(fsHandlerData->magic, XVFS_INTERNAL_SERVER_MAGIC, sizeof(fsHandlerData->magic)) == 0) {
		XVFS_DEBUG_PUTS("Found a server handler");
		xvfs_register = fsHandlerData->registerProc;
	}

	XVFS_DEBUG_LEAVE;

	return(xvfs_register(interp, fsInfo));
}
#endif /* XVFS_MODE_FLEXIBLE */

#if defined(XVFS_MODE_SERVER)
static Tcl_Filesystem xvfs_tclfs_dispatch_fs;
static Tcl_HashTable xvfs_tclfs_dispatch_map;
static struct xvfs_tclfs_server_info xvfs_tclfs_dispatch_fsdata;

static struct xvfs_tclfs_instance_info *xvfs_tclfs_dispatch_pathToInstanceInfo(Tcl_Obj *path) {
static int xvfs_tclfs_dispatch_pathInFilesystem(Tcl_Obj *path, ClientData *dataPtr) {
	Tcl_HashEntry *mapEntry;
	struct xvfs_tclfs_instance_info *retval;
	const char *pathStr, *rootStr;
	char *fsName, *fsNameEnds, origSep;
	int pathLen, rootLen;

	XVFS_DEBUG_ENTER;

	XVFS_DEBUG_PRINTF("Looking up path \"%s\" ...", Tcl_GetString(path));
	XVFS_DEBUG_PRINTF("Verifying that \"%s\" belongs in XVFS ...", Tcl_GetString(path));
	
	rootStr = XVFS_ROOT_MOUNTPOINT;
	rootLen = strlen(XVFS_ROOT_MOUNTPOINT);

	pathStr = Tcl_GetStringFromObj(path, &pathLen);

	if (pathLen < rootLen) {
		XVFS_DEBUG_PUTS("... failed (length too short)");
		XVFS_DEBUG_LEAVE;
		return(NULL);
		return(-1);
	}

	if (memcmp(pathStr, rootStr, rootLen) != 0) {
		XVFS_DEBUG_PUTS("... failed (incorrect prefix)");
		XVFS_DEBUG_LEAVE;
		return(-1);
	}

	XVFS_DEBUG_PUTS("... yes");

	XVFS_DEBUG_LEAVE;

	return(TCL_OK);
}

static struct xvfs_tclfs_instance_info *xvfs_tclfs_dispatch_pathToInfo(Tcl_Obj *path) {
	Tcl_HashEntry *mapEntry;
	struct xvfs_tclfs_instance_info *retval;
	int rootLen;
	char *pathStr, *fsName, *fsNameEnds, origSep;

	XVFS_DEBUG_ENTER;

	if (xvfs_tclfs_dispatch_pathInFilesystem(path, NULL) != TCL_OK) {
		XVFS_DEBUG_LEAVE;

		return(NULL);
	}

	rootLen = strlen(XVFS_ROOT_MOUNTPOINT);
	pathStr = Tcl_GetString(path);

	fsName = ((char *) pathStr) + rootLen;

	fsNameEnds = strchr(fsName, '/');
	if (fsNameEnds) {
		origSep = *fsNameEnds;
		*fsNameEnds = '\0';
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		XVFS_DEBUG_PUTS("... found no registered filesystem.");
	}

	XVFS_DEBUG_LEAVE;
	return(retval);
}

static int xvfs_tclfs_dispatch_pathInFilesystem(Tcl_Obj *path, ClientData *dataPtr) {
	static struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInstanceInfo(path);
	if (!instanceInfo) {
		return(-1);
	}

	return(xvfs_tclfs_pathInFilesystem(path, dataPtr, instanceInfo));
}

static int xvfs_tclfs_dispatch_stat(Tcl_Obj *path, Tcl_StatBuf *statBuf) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInstanceInfo(path);
	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(path);
	if (!instanceInfo) {
		Tcl_SetErrno(xvfs_errorToErrno(XVFS_RV_ERR_ENOENT));

		return(0);
		return(-1);
	}

	return(xvfs_tclfs_stat(path, statBuf, instanceInfo));
}

static int xvfs_tclfs_dispatch_access(Tcl_Obj *path, int mode) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInstanceInfo(path);
	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(path);
	if (!instanceInfo) {
		return(-1);
	}

	return(xvfs_tclfs_access(path, mode, instanceInfo));
}

static Tcl_Channel xvfs_tclfs_dispatch_openFileChannel(Tcl_Interp *interp, Tcl_Obj *path, int mode, int permissions) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInstanceInfo(path);
	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(path);
	if (!instanceInfo) {
		return(NULL);
	}

	return(xvfs_tclfs_openFileChannel(interp, path, mode, permissions, instanceInfo));
}

static int xvfs_tclfs_dispatch_matchInDir(Tcl_Interp *interp, Tcl_Obj *resultPtr, Tcl_Obj *pathPtr, const char *pattern, Tcl_GlobTypeData *types) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInstanceInfo(pathPtr);
	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(pathPtr);
	if (!instanceInfo) {
		return(TCL_ERROR);
	}

	return(xvfs_tclfs_matchInDir(interp, resultPtr, pathPtr, pattern, types, instanceInfo));
}

static int xvfs_tclfs_dispatch_init(Tcl_Interp *interp) {
int Xvfs_Init(Tcl_Interp *interp) {
	static int registered = 0;
	int tclRet;

	/* XXX:TODO: Make this thread-safe */
	if (registered) {
		return(TCL_OK);
	}
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	xvfs_tclfs_dispatch_fs.renameFileProc             = NULL;
	xvfs_tclfs_dispatch_fs.copyDirectoryProc          = NULL;
	xvfs_tclfs_dispatch_fs.lstatProc                  = NULL;
	xvfs_tclfs_dispatch_fs.loadFileProc               = NULL;
	xvfs_tclfs_dispatch_fs.getCwdProc                 = NULL;
	xvfs_tclfs_dispatch_fs.chdirProc                  = NULL;

	memcpy(xvfs_tclfs_dispatch_fsdata.magic, XVFS_INTERNAL_SERVER_MAGIC, XVFS_INTERNAL_SERVER_MAGIC_LEN);
	tclRet = Tcl_FSRegister(NULL, &xvfs_tclfs_dispatch_fs);
	xvfs_tclfs_dispatch_fsdata.registerProc = Xvfs_Register;

	tclRet = Tcl_FSRegister((ClientData) &xvfs_tclfs_dispatch_fsdata, &xvfs_tclfs_dispatch_fs);
	if (tclRet != TCL_OK) {
		if (interp) {
			Tcl_SetResult(interp, "Tcl_FSRegister() failed", NULL);
		}

		return(tclRet);
	}
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int Xvfs_Register(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) {
	Tcl_HashEntry *mapEntry;
	struct xvfs_tclfs_instance_info *instanceInfo;
	int dispatchInitRet;
	int new;

	dispatchInitRet = xvfs_tclfs_dispatch_init(interp);
	dispatchInitRet = Xvfs_Init(interp);
	if (dispatchInitRet != TCL_OK) {
		return(dispatchInitRet);
	}

	/*
	 * Verify this is for a protocol we support
	 */
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Modified xvfs-core.h from [d0f2e4af12] to [b57f187c12].

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#elif defined(XVFS_MODE_SERVER)
/*
 * In server mode we are going to implementing Xvfs_Register()
 * for flexible/client modes, just forward declare it
 */
XVFS_REGISTER_INTERFACE(Xvfs_Register)
int Xvfs_Init(Tcl_Interp *interp);

#else
#  error Unsupported XVFS_MODE
#endif

/*
 * In flexible or standalone mode, directly include what
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