/* * tclIOCmd.c -- * * Contains the definitions of most of the Tcl commands relating to IO. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclIOCmd.c,v 1.12 2002/01/17 20:35:22 andreas_kupries Exp $ */ #include "tclInt.h" #include "tclPort.h" /* * Callback structure for accept callback in a TCP server. */ typedef struct AcceptCallback { char *script; /* Script to invoke. */ Tcl_Interp *interp; /* Interpreter in which to run it. */ } AcceptCallback; /* * Static functions for this file: */ static void AcceptCallbackProc _ANSI_ARGS_((ClientData callbackData, Tcl_Channel chan, char *address, int port)); static void RegisterTcpServerInterpCleanup _ANSI_ARGS_((Tcl_Interp *interp, AcceptCallback *acceptCallbackPtr)); static void TcpAcceptCallbacksDeleteProc _ANSI_ARGS_(( ClientData clientData, Tcl_Interp *interp)); static void TcpServerCloseProc _ANSI_ARGS_((ClientData callbackData)); static void UnregisterTcpServerInterpCleanupProc _ANSI_ARGS_(( Tcl_Interp *interp, AcceptCallback *acceptCallbackPtr)); /* *---------------------------------------------------------------------- * * Tcl_PutsObjCmd -- * * This procedure is invoked to process the "puts" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Produces output on a channel. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_PutsObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to puts on. */ Tcl_Obj *string; /* String to write. */ int newline; /* Add a newline at end? */ char *channelId; /* Name of channel for puts. */ int result; /* Result of puts operation. */ int mode; /* Mode in which channel is opened. */ switch (objc) { case 2: /* puts $x */ string = objv[1]; newline = 1; channelId = "stdout"; break; case 3: /* puts -nonewline $x or puts $chan $x */ if (strcmp(Tcl_GetString(objv[1]), "-nonewline") == 0) { newline = 0; channelId = "stdout"; } else { newline = 1; channelId = Tcl_GetString(objv[1]); } string = objv[2]; break; case 4: /* puts -nonewline $chan $x or puts $chan $x nonewline */ if (strcmp(Tcl_GetString(objv[1]), "-nonewline") == 0) { channelId = Tcl_GetString(objv[2]); string = objv[3]; } else { /* * The code below provides backwards compatibility with an * old form of the command that is no longer recommended * or documented. */ char *arg; int length; arg = Tcl_GetStringFromObj(objv[3], &length); if (strncmp(arg, "nonewline", (size_t) length) != 0) { Tcl_AppendResult(interp, "bad argument \"", arg, "\": should be \"nonewline\"", (char *) NULL); return TCL_ERROR; } channelId = Tcl_GetString(objv[1]); string = objv[2]; } newline = 0; break; default: /* puts or puts some bad number of arguments... */ Tcl_WrongNumArgs(interp, 1, objv, "?-nonewline? ?channelId? string"); return TCL_ERROR; } chan = Tcl_GetChannel(interp, channelId, &mode); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_WRITABLE) == 0) { Tcl_AppendResult(interp, "channel \"", channelId, "\" wasn't opened for writing", (char *) NULL); return TCL_ERROR; } result = Tcl_WriteObj(chan, string); if (result < 0) { goto error; } if (newline != 0) { result = Tcl_WriteChars(chan, "\n", 1); if (result < 0) { goto error; } } return TCL_OK; error: Tcl_AppendResult(interp, "error writing \"", channelId, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * Tcl_FlushObjCmd -- * * This procedure is called to process the Tcl "flush" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * May cause output to appear on the specified channel. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_FlushObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to flush on. */ char *channelId; int mode; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "channelId"); return TCL_ERROR; } channelId = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, channelId, &mode); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_WRITABLE) == 0) { Tcl_AppendResult(interp, "channel \"", channelId, "\" wasn't opened for writing", (char *) NULL); return TCL_ERROR; } if (Tcl_Flush(chan) != TCL_OK) { Tcl_AppendResult(interp, "error flushing \"", channelId, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_GetsObjCmd -- * * This procedure is called to process the Tcl "gets" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * May consume input from channel. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_GetsObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to read from. */ int lineLen; /* Length of line just read. */ int mode; /* Mode in which channel is opened. */ char *name; Tcl_Obj *resultPtr, *linePtr; if ((objc != 2) && (objc != 3)) { Tcl_WrongNumArgs(interp, 1, objv, "channelId ?varName?"); return TCL_ERROR; } name = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, name, &mode); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_READABLE) == 0) { Tcl_AppendResult(interp, "channel \"", name, "\" wasn't opened for reading", (char *) NULL); return TCL_ERROR; } linePtr = Tcl_NewObj(); lineLen = Tcl_GetsObj(chan, linePtr); if (lineLen < 0) { if (!Tcl_Eof(chan) && !Tcl_InputBlocked(chan)) { if (objc == 3) { Tcl_DecrRefCount(linePtr); } Tcl_ResetResult(interp); Tcl_AppendResult(interp, "error reading \"", name, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } lineLen = -1; } if (objc == 3) { if (Tcl_ObjSetVar2(interp, objv[2], NULL, linePtr, TCL_LEAVE_ERR_MSG) == NULL) { Tcl_DecrRefCount(linePtr); return TCL_ERROR; } resultPtr = Tcl_GetObjResult(interp); Tcl_SetIntObj(resultPtr, lineLen); return TCL_OK; } else { Tcl_SetObjResult(interp, linePtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_ReadObjCmd -- * * This procedure is invoked to process the Tcl "read" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * May consume input from channel. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_ReadObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to read from. */ int newline, i; /* Discard newline at end? */ int toRead; /* How many bytes to read? */ int charactersRead; /* How many characters were read? */ int mode; /* Mode in which channel is opened. */ char *name; Tcl_Obj *resultPtr; if ((objc != 2) && (objc != 3)) { argerror: Tcl_WrongNumArgs(interp, 1, objv, "channelId ?numChars?"); Tcl_AppendResult(interp, " or \"", Tcl_GetString(objv[0]), " ?-nonewline? channelId\"", (char *) NULL); return TCL_ERROR; } i = 1; newline = 0; if (strcmp(Tcl_GetString(objv[1]), "-nonewline") == 0) { newline = 1; i++; } if (i == objc) { goto argerror; } name = Tcl_GetString(objv[i]); chan = Tcl_GetChannel(interp, name, &mode); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_READABLE) == 0) { Tcl_AppendResult(interp, "channel \"", name, "\" wasn't opened for reading", (char *) NULL); return TCL_ERROR; } i++; /* Consumed channel name. */ /* * Compute how many bytes to read, and see whether the final * newline should be dropped. */ toRead = -1; if (i < objc) { char *arg; arg = Tcl_GetString(objv[i]); if (isdigit(UCHAR(arg[0]))) { /* INTL: digit */ if (Tcl_GetIntFromObj(interp, objv[i], &toRead) != TCL_OK) { return TCL_ERROR; } } else if (strcmp(arg, "nonewline") == 0) { newline = 1; } else { Tcl_AppendResult(interp, "bad argument \"", arg, "\": should be \"nonewline\"", (char *) NULL); return TCL_ERROR; } } resultPtr = Tcl_NewObj(); Tcl_IncrRefCount(resultPtr); charactersRead = Tcl_ReadChars(chan, resultPtr, toRead, 0); if (charactersRead < 0) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "error reading \"", name, "\": ", Tcl_PosixError(interp), (char *) NULL); Tcl_DecrRefCount(resultPtr); return TCL_ERROR; } /* * If requested, remove the last newline in the channel if at EOF. */ if ((charactersRead > 0) && (newline != 0)) { char *result; int length; result = Tcl_GetStringFromObj(resultPtr, &length); if (result[length - 1] == '\n') { Tcl_SetObjLength(resultPtr, length - 1); } } Tcl_SetObjResult(interp, resultPtr); Tcl_DecrRefCount(resultPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_SeekObjCmd -- * * This procedure is invoked to process the Tcl "seek" command. See * the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Moves the position of the access point on the specified channel. * May flush queued output. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_SeekObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to tell on. */ int offset, mode; /* Where to seek? */ int result; /* Of calling Tcl_Seek. */ char *chanName; int optionIndex; static CONST char *originOptions[] = { "start", "current", "end", (char *) NULL }; static int modeArray[] = {SEEK_SET, SEEK_CUR, SEEK_END}; if ((objc != 3) && (objc != 4)) { Tcl_WrongNumArgs(interp, 1, objv, "channelId offset ?origin?"); return TCL_ERROR; } chanName = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, chanName, NULL); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if (Tcl_GetIntFromObj(interp, objv[2], &offset) != TCL_OK) { return TCL_ERROR; } mode = SEEK_SET; if (objc == 4) { if (Tcl_GetIndexFromObj(interp, objv[3], originOptions, "origin", 0, &optionIndex) != TCL_OK) { return TCL_ERROR; } mode = modeArray[optionIndex]; } result = Tcl_Seek(chan, offset, mode); if (result == -1) { Tcl_AppendResult(interp, "error during seek on \"", chanName, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_TellObjCmd -- * * This procedure is invoked to process the Tcl "tell" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_TellObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to tell on. */ char *chanName; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "channelId"); return TCL_ERROR; } /* * Try to find a channel with the right name and permissions in * the IO channel table of this interpreter. */ chanName = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, chanName, NULL); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } Tcl_SetIntObj(Tcl_GetObjResult(interp), Tcl_Tell(chan)); return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_CloseObjCmd -- * * This procedure is invoked to process the Tcl "close" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * May discard queued input; may flush queued output. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_CloseObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; /* The channel to close. */ char *arg; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "channelId"); return TCL_ERROR; } arg = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, arg, NULL); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if (Tcl_UnregisterChannel(interp, chan) != TCL_OK) { /* * If there is an error message and it ends with a newline, remove * the newline. This is done for command pipeline channels where the * error output from the subprocesses is stored in interp's result. * * NOTE: This is likely to not have any effect on regular error * messages produced by drivers during the closing of a channel, * because the Tcl convention is that such error messages do not * have a terminating newline. */ Tcl_Obj *resultPtr; char *string; int len; resultPtr = Tcl_GetObjResult(interp); string = Tcl_GetStringFromObj(resultPtr, &len); if ((len > 0) && (string[len - 1] == '\n')) { Tcl_SetObjLength(resultPtr, len - 1); } return TCL_ERROR; } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_FconfigureObjCmd -- * * This procedure is invoked to process the Tcl "fconfigure" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * May modify the behavior of an IO channel. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_FconfigureObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { char *chanName, *optionName, *valueName; Tcl_Channel chan; /* The channel to set a mode on. */ int i; /* Iterate over arg-value pairs. */ Tcl_DString ds; /* DString to hold result of * calling Tcl_GetChannelOption. */ if ((objc < 2) || (((objc % 2) == 1) && (objc != 3))) { Tcl_WrongNumArgs(interp, 1, objv, "channelId ?optionName? ?value? ?optionName value?..."); return TCL_ERROR; } chanName = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, chanName, NULL); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if (objc == 2) { Tcl_DStringInit(&ds); if (Tcl_GetChannelOption(interp, chan, (char *) NULL, &ds) != TCL_OK) { Tcl_DStringFree(&ds); return TCL_ERROR; } Tcl_DStringResult(interp, &ds); return TCL_OK; } if (objc == 3) { Tcl_DStringInit(&ds); optionName = Tcl_GetString(objv[2]); if (Tcl_GetChannelOption(interp, chan, optionName, &ds) != TCL_OK) { Tcl_DStringFree(&ds); return TCL_ERROR; } Tcl_DStringResult(interp, &ds); return TCL_OK; } for (i = 3; i < objc; i += 2) { optionName = Tcl_GetString(objv[i-1]); valueName = Tcl_GetString(objv[i]); if (Tcl_SetChannelOption(interp, chan, optionName, valueName) != TCL_OK) { return TCL_ERROR; } } return TCL_OK; } /* *--------------------------------------------------------------------------- * * Tcl_EofObjCmd -- * * This procedure is invoked to process the Tcl "eof" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Sets interp's result to boolean true or false depending on whether * the specified channel has an EOF condition. * *--------------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_EofObjCmd(unused, interp, objc, objv) ClientData unused; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; int dummy; char *arg; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "channelId"); return TCL_ERROR; } arg = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, arg, &dummy); if (chan == NULL) { return TCL_ERROR; } Tcl_SetBooleanObj(Tcl_GetObjResult(interp), Tcl_Eof(chan)); return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_ExecObjCmd -- * * This procedure is invoked to process the "exec" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_ExecObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { #ifdef MAC_TCL Tcl_AppendResult(interp, "exec not implemented under Mac OS", (char *)NULL); return TCL_ERROR; #else /* !MAC_TCL */ /* * This procedure generates an argv array for the string arguments. It * starts out with stack-allocated space but uses dynamically-allocated * storage if needed. */ #define NUM_ARGS 20 Tcl_Obj *resultPtr; char **argv; char *string; Tcl_Channel chan; char *argStorage[NUM_ARGS]; int argc, background, i, index, keepNewline, result, skip, length; static CONST char *options[] = { "-keepnewline", "--", NULL }; enum options { EXEC_KEEPNEWLINE, EXEC_LAST }; /* * Check for a leading "-keepnewline" argument. */ keepNewline = 0; for (skip = 1; skip < objc; skip++) { string = Tcl_GetString(objv[skip]); if (string[0] != '-') { break; } if (Tcl_GetIndexFromObj(interp, objv[skip], options, "switch", TCL_EXACT, &index) != TCL_OK) { return TCL_ERROR; } if (index == EXEC_KEEPNEWLINE) { keepNewline = 1; } else { skip++; break; } } if (objc <= skip) { Tcl_WrongNumArgs(interp, 1, objv, "?switches? arg ?arg ...?"); return TCL_ERROR; } /* * See if the command is to be run in background. */ background = 0; string = Tcl_GetString(objv[objc - 1]); if ((string[0] == '&') && (string[1] == '\0')) { objc--; background = 1; } /* * Create the string argument array "argv". Make sure argv is large * enough to hold the argc arguments plus 1 extra for the zero * end-of-argv word. */ argv = argStorage; argc = objc - skip; if ((argc + 1) > sizeof(argv) / sizeof(argv[0])) { argv = (char **) ckalloc((unsigned)(argc + 1) * sizeof(char *)); } /* * Copy the string conversions of each (post option) object into the * argument vector. */ for (i = 0; i < argc; i++) { argv[i] = Tcl_GetString(objv[i + skip]); } argv[argc] = NULL; chan = Tcl_OpenCommandChannel(interp, argc, argv, (background ? 0 : TCL_STDOUT | TCL_STDERR)); /* * Free the argv array if malloc'ed storage was used. */ if (argv != argStorage) { ckfree((char *)argv); } if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } if (background) { /* * Store the list of PIDs from the pipeline in interp's result and * detach the PIDs (instead of waiting for them). */ TclGetAndDetachPids(interp, chan); if (Tcl_Close(interp, chan) != TCL_OK) { return TCL_ERROR; } return TCL_OK; } resultPtr = Tcl_NewObj(); if (Tcl_GetChannelHandle(chan, TCL_READABLE, NULL) == TCL_OK) { if (Tcl_ReadChars(chan, resultPtr, -1, 0) < 0) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "error reading output from command: ", Tcl_PosixError(interp), (char *) NULL); Tcl_DecrRefCount(resultPtr); return TCL_ERROR; } } /* * If the process produced anything on stderr, it will have been * returned in the interpreter result. It needs to be appended to * the result string. */ result = Tcl_Close(interp, chan); string = Tcl_GetStringFromObj(Tcl_GetObjResult(interp), &length); Tcl_AppendToObj(resultPtr, string, length); /* * If the last character of the result is a newline, then remove * the newline character. */ if (keepNewline == 0) { string = Tcl_GetStringFromObj(resultPtr, &length); if ((length > 0) && (string[length - 1] == '\n')) { Tcl_SetObjLength(resultPtr, length - 1); } } Tcl_SetObjResult(interp, resultPtr); return result; #endif /* !MAC_TCL */ } /* *--------------------------------------------------------------------------- * * Tcl_FblockedObjCmd -- * * This procedure is invoked to process the Tcl "fblocked" command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Sets interp's result to boolean true or false depending on whether * the preceeding input operation on the channel would have blocked. * *--------------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_FblockedObjCmd(unused, interp, objc, objv) ClientData unused; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel chan; int mode; char *arg; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "channelId"); return TCL_ERROR; } arg = Tcl_GetString(objv[1]); chan = Tcl_GetChannel(interp, arg, &mode); if (chan == NULL) { return TCL_ERROR; } if ((mode & TCL_READABLE) == 0) { Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"", arg, "\" wasn't opened for reading", (char *) NULL); return TCL_ERROR; } Tcl_SetBooleanObj(Tcl_GetObjResult(interp), Tcl_InputBlocked(chan)); return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_OpenObjCmd -- * * This procedure is invoked to process the "open" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_OpenObjCmd(notUsed, interp, objc, objv) ClientData notUsed; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { int pipeline, prot; char *modeString, *what; Tcl_Channel chan; if ((objc < 2) || (objc > 4)) { Tcl_WrongNumArgs(interp, 1, objv, "fileName ?access? ?permissions?"); return TCL_ERROR; } prot = 0666; if (objc == 2) { modeString = "r"; } else { modeString = Tcl_GetString(objv[2]); if (objc == 4) { if (Tcl_GetIntFromObj(interp, objv[3], &prot) != TCL_OK) { return TCL_ERROR; } } } pipeline = 0; what = Tcl_GetString(objv[1]); if (what[0] == '|') { 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; 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); (void) Tcl_SetAssocData(interp, "tclTCPAcceptCallbacks", TcpAcceptCallbacksDeleteProc, (ClientData) hTblPtr); } hPtr = Tcl_CreateHashEntry(hTblPtr, (char *) acceptCallbackPtr, &new); if (!new) { panic("RegisterTcpServerCleanup: damaged accept record table"); } Tcl_SetHashValue(hPtr, (ClientData) acceptCallbackPtr); } /* *---------------------------------------------------------------------- * * UnregisterTcpServerInterpCleanupProc -- * * Unregister a previously registered accept callback record. The * interp field of this record will no longer be set to NULL in * the future when the interpreter is deleted. * * Results: * None. * * Side effects: * Prevents the interp field of the accept callback record from * being set to NULL in the future when the interpreter is deleted. * *---------------------------------------------------------------------- */ static void UnregisterTcpServerInterpCleanupProc(interp, acceptCallbackPtr) Tcl_Interp *interp; /* Interpreter in which the accept callback * record was registered. */ AcceptCallback *acceptCallbackPtr; /* The record for which to delete the * registration. */ { Tcl_HashTable *hTblPtr; Tcl_HashEntry *hPtr; hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclTCPAcceptCallbacks", NULL); if (hTblPtr == (Tcl_HashTable *) NULL) { return; } hPtr = Tcl_FindHashEntry(hTblPtr, (char *) acceptCallbackPtr); if (hPtr == (Tcl_HashEntry *) NULL) { return; } Tcl_DeleteHashEntry(hPtr); } /* *---------------------------------------------------------------------- * * AcceptCallbackProc -- * * This callback is invoked by the TCP channel driver when it * accepts a new connection from a client on a server socket. * * Results: * None. * * Side effects: * Whatever the script does. * *---------------------------------------------------------------------- */ static void AcceptCallbackProc(callbackData, chan, address, port) ClientData callbackData; /* The data stored when the callback * was created in the call to * Tcl_OpenTcpServer. */ Tcl_Channel chan; /* Channel for the newly accepted * connection. */ char *address; /* Address of client that was * accepted. */ int port; /* Port of client that was accepted. */ { AcceptCallback *acceptCallbackPtr; Tcl_Interp *interp; char *script; char portBuf[TCL_INTEGER_SPACE]; int result; acceptCallbackPtr = (AcceptCallback *) callbackData; /* * Check if the callback is still valid; the interpreter may have gone * away, this is signalled by setting the interp field of the callback * data to NULL. */ if (acceptCallbackPtr->interp != (Tcl_Interp *) NULL) { script = acceptCallbackPtr->script; interp = acceptCallbackPtr->interp; Tcl_Preserve((ClientData) script); Tcl_Preserve((ClientData) interp); TclFormatInt(portBuf, port); Tcl_RegisterChannel(interp, chan); /* * Artificially bump the refcount to protect the channel from * being deleted while the script is being evaluated. */ Tcl_RegisterChannel((Tcl_Interp *) NULL, chan); result = Tcl_VarEval(interp, script, " ", Tcl_GetChannelName(chan), " ", address, " ", portBuf, (char *) NULL); if (result != TCL_OK) { Tcl_BackgroundError(interp); Tcl_UnregisterChannel(interp, chan); } /* * Decrement the artificially bumped refcount. After this it is * not safe anymore to use "chan", because it may now be deleted. */ Tcl_UnregisterChannel((Tcl_Interp *) NULL, chan); Tcl_Release((ClientData) interp); Tcl_Release((ClientData) script); } else { /* * The interpreter has been deleted, so there is no useful * way to utilize the client socket - just close it. */ Tcl_Close((Tcl_Interp *) NULL, chan); } } /* *---------------------------------------------------------------------- * * TcpServerCloseProc -- * * This callback is called when the TCP server channel for which it * was registered is being closed. It informs the interpreter in * which the accept script is evaluated (if that interpreter still * exists) that this channel no longer needs to be informed if the * interpreter is deleted. * * Results: * None. * * Side effects: * In the future, if the interpreter is deleted this channel will * no longer be informed. * *---------------------------------------------------------------------- */ static void TcpServerCloseProc(callbackData) ClientData callbackData; /* The data passed in the call to * Tcl_CreateCloseHandler. */ { AcceptCallback *acceptCallbackPtr; /* The actual data. */ acceptCallbackPtr = (AcceptCallback *) callbackData; if (acceptCallbackPtr->interp != (Tcl_Interp *) NULL) { UnregisterTcpServerInterpCleanupProc(acceptCallbackPtr->interp, acceptCallbackPtr); } Tcl_EventuallyFree((ClientData) acceptCallbackPtr->script, TCL_DYNAMIC); ckfree((char *) acceptCallbackPtr); } /* *---------------------------------------------------------------------- * * Tcl_SocketObjCmd -- * * This procedure is invoked to process the "socket" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Creates a socket based channel. * *---------------------------------------------------------------------- */ int Tcl_SocketObjCmd(notUsed, interp, objc, objv) ClientData notUsed; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { static CONST char *socketOptions[] = { "-async", "-myaddr", "-myport","-server", (char *) NULL }; enum socketOptions { SKT_ASYNC, SKT_MYADDR, SKT_MYPORT, SKT_SERVER }; int optionIndex, a, server, port; char *arg, *copyScript, *host, *script; char *myaddr = NULL; int myport = 0; int async = 0; Tcl_Channel chan; AcceptCallback *acceptCallbackPtr; server = 0; script = NULL; if (TclpHasSockets(interp) != TCL_OK) { return TCL_ERROR; } for (a = 1; a < objc; a++) { arg = Tcl_GetString(objv[a]); if (arg[0] != '-') { break; } if (Tcl_GetIndexFromObj(interp, objv[a], socketOptions, "option", TCL_EXACT, &optionIndex) != TCL_OK) { return TCL_ERROR; } switch ((enum socketOptions) optionIndex) { case SKT_ASYNC: { if (server == 1) { Tcl_AppendResult(interp, "cannot set -async option for server sockets", (char *) NULL); return TCL_ERROR; } async = 1; break; } case SKT_MYADDR: { a++; if (a >= objc) { Tcl_AppendResult(interp, "no argument given for -myaddr option", (char *) NULL); return TCL_ERROR; } myaddr = Tcl_GetString(objv[a]); break; } case SKT_MYPORT: { char *myPortName; a++; if (a >= objc) { Tcl_AppendResult(interp, "no argument given for -myport option", (char *) NULL); return TCL_ERROR; } myPortName = Tcl_GetString(objv[a]); if (TclSockGetPort(interp, myPortName, "tcp", &myport) != TCL_OK) { return TCL_ERROR; } break; } case SKT_SERVER: { if (async == 1) { Tcl_AppendResult(interp, "cannot set -async option for server sockets", (char *) NULL); return TCL_ERROR; } server = 1; a++; if (a >= objc) { Tcl_AppendResult(interp, "no argument given for -server option", (char *) NULL); return TCL_ERROR; } script = Tcl_GetString(objv[a]); break; } default: { panic("Tcl_SocketObjCmd: bad option index to SocketOptions"); } } } if (server) { host = myaddr; /* NULL implies INADDR_ANY */ if (myport != 0) { Tcl_AppendResult(interp, "Option -myport is not valid for servers", NULL); return TCL_ERROR; } } else if (a < objc) { host = Tcl_GetString(objv[a]); a++; } else { wrongNumArgs: Tcl_AppendResult(interp, "wrong # args: should be either:\n", Tcl_GetString(objv[0]), " ?-myaddr addr? ?-myport myport? ?-async? host port\n", Tcl_GetString(objv[0]), " -server command ?-myaddr addr? port", (char *) NULL); return TCL_ERROR; } if (a == objc-1) { if (TclSockGetPort(interp, Tcl_GetString(objv[a]), "tcp", &port) != TCL_OK) { return TCL_ERROR; } } else { goto wrongNumArgs; } if (server) { acceptCallbackPtr = (AcceptCallback *) ckalloc((unsigned) sizeof(AcceptCallback)); copyScript = ckalloc((unsigned) strlen(script) + 1); strcpy(copyScript, script); acceptCallbackPtr->script = copyScript; acceptCallbackPtr->interp = interp; chan = Tcl_OpenTcpServer(interp, port, host, AcceptCallbackProc, (ClientData) acceptCallbackPtr); if (chan == (Tcl_Channel) NULL) { ckfree(copyScript); ckfree((char *) acceptCallbackPtr); return TCL_ERROR; } /* * Register with the interpreter to let us know when the * interpreter is deleted (by having the callback set the * acceptCallbackPtr->interp field to NULL). This is to * avoid trying to eval the script in a deleted interpreter. */ RegisterTcpServerInterpCleanup(interp, acceptCallbackPtr); /* * Register a close callback. This callback will inform the * interpreter (if it still exists) that this channel does not * need to be informed when the interpreter is deleted. */ Tcl_CreateCloseHandler(chan, TcpServerCloseProc, (ClientData) acceptCallbackPtr); } else { chan = Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } } Tcl_RegisterChannel(interp, chan); Tcl_AppendResult(interp, Tcl_GetChannelName(chan), (char *) NULL); return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_FcopyObjCmd -- * * This procedure is invoked to process the "fcopy" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * Moves data between two channels and possibly sets up a * background copy handler. * *---------------------------------------------------------------------- */ int Tcl_FcopyObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Tcl_Channel inChan, outChan; char *arg; int mode, i; int toRead, index; Tcl_Obj *cmdPtr; static CONST char* switches[] = { "-size", "-command", NULL }; enum { FcopySize, FcopyCommand }; if ((objc < 3) || (objc > 7) || (objc == 4) || (objc == 6)) { Tcl_WrongNumArgs(interp, 1, objv, "input output ?-size size? ?-command callback?"); return TCL_ERROR; } /* * Parse the channel arguments and verify that they are readable * or writable, as appropriate. */ arg = Tcl_GetString(objv[1]); inChan = Tcl_GetChannel(interp, arg, &mode); if (inChan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_READABLE) == 0) { Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"", Tcl_GetString(objv[1]), "\" wasn't opened for reading", (char *) NULL); return TCL_ERROR; } arg = Tcl_GetString(objv[2]); outChan = Tcl_GetChannel(interp, arg, &mode); if (outChan == (Tcl_Channel) NULL) { return TCL_ERROR; } if ((mode & TCL_WRITABLE) == 0) { Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"", Tcl_GetString(objv[1]), "\" wasn't opened for writing", (char *) NULL); return TCL_ERROR; } toRead = -1; cmdPtr = NULL; for (i = 3; i < objc; i += 2) { if (Tcl_GetIndexFromObj(interp, objv[i], switches, "switch", 0, (int *) &index) != TCL_OK) { return TCL_ERROR; } switch (index) { case FcopySize: if (Tcl_GetIntFromObj(interp, objv[i+1], &toRead) != TCL_OK) { return TCL_ERROR; } break; case FcopyCommand: cmdPtr = objv[i+1]; break; } } return TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr); }