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pTk/mTk/tclGeneric/tclIOCmd.c  view on Meta::CPAN

	pipeline = 1;
    }

    /*
     * Open the file or create a process pipeline.
     */

    if (!pipeline) {
        chan = Tcl_FSOpenFileChannel(interp, objv[1], modeString, prot);
    } else {
#ifdef MAC_TCL
	Tcl_AppendResult(interp,
		"command pipelines not supported on Macintosh OS",
		(char *)NULL);
	return TCL_ERROR;
#else
	int mode, seekFlag, cmdObjc;
	CONST char **cmdArgv;

        if (Tcl_SplitList(interp, what+1, &cmdObjc, &cmdArgv) != TCL_OK) {
            return TCL_ERROR;
        }

        mode = TclGetOpenMode(interp, modeString, &seekFlag);
        if (mode == -1) {
	    chan = NULL;
        } else {
	    int flags = TCL_STDERR | TCL_ENFORCE_MODE;
	    switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
		case O_RDONLY:
		    flags |= TCL_STDOUT;
		    break;
		case O_WRONLY:
		    flags |= TCL_STDIN;
		    break;
		case O_RDWR:
		    flags |= (TCL_STDIN | TCL_STDOUT);
		    break;
		default:
		    panic("Tcl_OpenCmd: invalid mode value");
		    break;
	    }
	    chan = Tcl_OpenCommandChannel(interp, cmdObjc, cmdArgv, flags);
	}
        ckfree((char *) cmdArgv);
#endif
    }
    if (chan == (Tcl_Channel) NULL) {
        return TCL_ERROR;
    }
    Tcl_RegisterChannel(interp, chan);
    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), (char *) NULL);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TcpAcceptCallbacksDeleteProc --
 *
 *	Assocdata cleanup routine called when an interpreter is being
 *	deleted to set the interp field of all the accept callback records
 *	registered with	the interpreter to NULL. This will prevent the
 *	interpreter from being used in the future to eval accept scripts.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deallocates memory and sets the interp field of all the accept
 *	callback records to NULL to prevent this interpreter from being
 *	used subsequently to eval accept scripts.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
static void
TcpAcceptCallbacksDeleteProc(clientData, interp)
    ClientData clientData;	/* Data which was passed when the assocdata
                                 * was registered. */
    Tcl_Interp *interp;		/* Interpreter being deleted - not used. */
{
    Tcl_HashTable *hTblPtr;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch hSearch;
    AcceptCallback *acceptCallbackPtr;

    hTblPtr = (Tcl_HashTable *) clientData;
    for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch);
             hPtr != (Tcl_HashEntry *) NULL;
             hPtr = Tcl_NextHashEntry(&hSearch)) {
        acceptCallbackPtr = (AcceptCallback *) Tcl_GetHashValue(hPtr);
        acceptCallbackPtr->interp = (Tcl_Interp *) NULL;
    }
    Tcl_DeleteHashTable(hTblPtr);
    ckfree((char *) hTblPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * RegisterTcpServerInterpCleanup --
 *
 *	Registers an accept callback record to have its interp
 *	field set to NULL when the interpreter is deleted.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When, in the future, the interpreter is deleted, the interp
 *	field of the accept callback data structure will be set to
 *	NULL. This will prevent attempts to eval the accept script
 *	in a deleted interpreter.
 *
 *----------------------------------------------------------------------
 */

static void
RegisterTcpServerInterpCleanup(interp, acceptCallbackPtr)
    Tcl_Interp *interp;		/* Interpreter for which we want to be
                                 * informed of deletion. */
    AcceptCallback *acceptCallbackPtr;
    				/* The accept callback record whose
                                 * interp field we want set to NULL when
                                 * the interpreter is deleted. */
{
    Tcl_HashTable *hTblPtr;	/* Hash table for accept callback
                                 * records to smash when the interpreter
                                 * will be deleted. */
    Tcl_HashEntry *hPtr;	/* Entry for this record. */
    int new;			/* Is the entry new? */

    hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp,
            "tclTCPAcceptCallbacks",
            NULL);
    if (hTblPtr == (Tcl_HashTable *) NULL) {
        hTblPtr = (Tcl_HashTable *) ckalloc((unsigned) sizeof(Tcl_HashTable));
        Tcl_InitHashTable(hTblPtr, TCL_ONE_WORD_KEYS);