/* * tclWinPipe.c -- * * This file implements the Windows-specific exec pipeline functions, * the "pipe" channel driver, and the "pid" Tcl command. * * Copyright (c) 1996-1997 by 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: tclWinPipe.c,v 1.29 2002/12/04 05:41:14 davygrvy Exp $ */ #include "tclWinInt.h" #include #include #include /* * The following variable is used to tell whether this module has been * initialized. */ static int initialized = 0; /* * The pipeMutex locks around access to the initialized and procList variables, * and it is used to protect background threads from being terminated while * they are using APIs that hold locks. */ TCL_DECLARE_MUTEX(pipeMutex) /* * The following defines identify the various types of applications that * run under windows. There is special case code for the various types. */ #define APPL_NONE 0 #define APPL_DOS 1 #define APPL_WIN3X 2 #define APPL_WIN32 3 /* * The following constants and structures are used to encapsulate the state * of various types of files used in a pipeline. * This used to have a 1 && 2 that supported Win32s. */ #define WIN_FILE 3 /* Basic Win32 file. */ /* * This structure encapsulates the common state associated with all file * types used in a pipeline. */ typedef struct WinFile { int type; /* One of the file types defined above. */ HANDLE handle; /* Open file handle. */ } WinFile; /* * This list is used to map from pids to process handles. */ typedef struct ProcInfo { HANDLE hProcess; DWORD dwProcessId; struct ProcInfo *nextPtr; } ProcInfo; static ProcInfo *procList; /* * Bit masks used in the flags field of the PipeInfo structure below. */ #define PIPE_PENDING (1<<0) /* Message is pending in the queue. */ #define PIPE_ASYNC (1<<1) /* Channel is non-blocking. */ /* * Bit masks used in the sharedFlags field of the PipeInfo structure below. */ #define PIPE_EOF (1<<2) /* Pipe has reached EOF. */ #define PIPE_EXTRABYTE (1<<3) /* The reader thread has consumed one byte. */ /* * This structure describes per-instance data for a pipe based channel. */ typedef struct PipeInfo { struct PipeInfo *nextPtr; /* Pointer to next registered pipe. */ Tcl_Channel channel; /* Pointer to channel structure. */ int validMask; /* OR'ed combination of TCL_READABLE, * TCL_WRITABLE, or TCL_EXCEPTION: indicates * which operations are valid on the file. */ int watchMask; /* OR'ed combination of TCL_READABLE, * TCL_WRITABLE, or TCL_EXCEPTION: indicates * which events should be reported. */ int flags; /* State flags, see above for a list. */ TclFile readFile; /* Output from pipe. */ TclFile writeFile; /* Input from pipe. */ TclFile errorFile; /* Error output from pipe. */ int numPids; /* Number of processes attached to pipe. */ Tcl_Pid *pidPtr; /* Pids of attached processes. */ Tcl_ThreadId threadId; /* Thread to which events should be reported. * This value is used by the reader/writer * threads. */ HANDLE writeThread; /* Handle to writer thread. */ HANDLE readThread; /* Handle to reader thread. */ HANDLE writable; /* Manual-reset event to signal when the * writer thread has finished waiting for * the current buffer to be written. */ HANDLE readable; /* Manual-reset event to signal when the * reader thread has finished waiting for * input. */ HANDLE startWriter; /* Auto-reset event used by the main thread to * signal when the writer thread should attempt * to write to the pipe. */ HANDLE stopWriter; /* Manual-reset event used to alert the reader * thread to fall-out and exit */ HANDLE startReader; /* Auto-reset event used by the main thread to * signal when the reader thread should attempt * to read from the pipe. */ HANDLE stopReader; /* Manual-reset event used to alert the reader * thread to fall-out and exit */ DWORD writeError; /* An error caused by the last background * write. Set to 0 if no error has been * detected. This word is shared with the * writer thread so access must be * synchronized with the writable object. */ char *writeBuf; /* Current background output buffer. * Access is synchronized with the writable * object. */ int writeBufLen; /* Size of write buffer. Access is * synchronized with the writable * object. */ int toWrite; /* Current amount to be written. Access is * synchronized with the writable object. */ int readFlags; /* Flags that are shared with the reader * thread. Access is synchronized with the * readable object. */ char extraByte; /* Buffer for extra character consumed by * reader thread. This byte is shared with * the reader thread so access must be * synchronized with the readable object. */ } PipeInfo; typedef struct ThreadSpecificData { /* * The following pointer refers to the head of the list of pipes * that are being watched for file events. */ PipeInfo *firstPipePtr; } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; /* * The following structure is what is added to the Tcl event queue when * pipe events are generated. */ typedef struct PipeEvent { Tcl_Event header; /* Information that is standard for * all events. */ PipeInfo *infoPtr; /* Pointer to pipe info structure. Note * that we still have to verify that the * pipe exists before dereferencing this * pointer. */ } PipeEvent; /* * Declarations for functions used only in this file. */ static int ApplicationType(Tcl_Interp *interp, const char *fileName, char *fullName); static void BuildCommandLine(const char *executable, int argc, CONST char **argv, Tcl_DString *linePtr); static BOOL HasConsole(void); static int PipeBlockModeProc(ClientData instanceData, int mode); static void PipeCheckProc(ClientData clientData, int flags); static int PipeClose2Proc(ClientData instanceData, Tcl_Interp *interp, int flags); static int PipeEventProc(Tcl_Event *evPtr, int flags); static void PipeExitHandler(ClientData clientData); static int PipeGetHandleProc(ClientData instanceData, int direction, ClientData *handlePtr); static void PipeInit(void); static int PipeInputProc(ClientData instanceData, char *buf, int toRead, int *errorCode); static int PipeOutputProc(ClientData instanceData, CONST char *buf, int toWrite, int *errorCode); static DWORD WINAPI PipeReaderThread(LPVOID arg); static void PipeSetupProc(ClientData clientData, int flags); static void PipeWatchProc(ClientData instanceData, int mask); static DWORD WINAPI PipeWriterThread(LPVOID arg); static void ProcExitHandler(ClientData clientData); static int TempFileName(WCHAR name[MAX_PATH]); static int WaitForRead(PipeInfo *infoPtr, int blocking); /* * This structure describes the channel type structure for command pipe * based IO. */ static Tcl_ChannelType pipeChannelType = { "pipe", /* Type name. */ TCL_CHANNEL_VERSION_2, /* v2 channel */ TCL_CLOSE2PROC, /* Close proc. */ PipeInputProc, /* Input proc. */ PipeOutputProc, /* Output proc. */ NULL, /* Seek proc. */ NULL, /* Set option proc. */ NULL, /* Get option proc. */ PipeWatchProc, /* Set up notifier to watch the channel. */ PipeGetHandleProc, /* Get an OS handle from channel. */ PipeClose2Proc, /* close2proc */ PipeBlockModeProc, /* Set blocking or non-blocking mode.*/ NULL, /* flush proc. */ NULL, /* handler proc. */ }; /* *---------------------------------------------------------------------- * * PipeInit -- * * This function initializes the static variables for this file. * * Results: * None. * * Side effects: * Creates a new event source. * *---------------------------------------------------------------------- */ static void PipeInit() { ThreadSpecificData *tsdPtr; /* * Check the initialized flag first, then check again in the mutex. * This is a speed enhancement. */ if (!initialized) { Tcl_MutexLock(&pipeMutex); if (!initialized) { initialized = 1; procList = NULL; Tcl_CreateExitHandler(ProcExitHandler, NULL); } Tcl_MutexUnlock(&pipeMutex); } tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); if (tsdPtr == NULL) { tsdPtr = TCL_TSD_INIT(&dataKey); tsdPtr->firstPipePtr = NULL; Tcl_CreateEventSource(PipeSetupProc, PipeCheckProc, NULL); Tcl_CreateThreadExitHandler(PipeExitHandler, NULL); } } /* *---------------------------------------------------------------------- * * PipeExitHandler -- * * This function is called to cleanup the pipe module before * Tcl is unloaded. * * Results: * None. * * Side effects: * Removes the pipe event source. * *---------------------------------------------------------------------- */ static void PipeExitHandler( ClientData clientData) /* Old window proc */ { Tcl_DeleteEventSource(PipeSetupProc, PipeCheckProc, NULL); } /* *---------------------------------------------------------------------- * * ProcExitHandler -- * * This function is called to cleanup the process list before * Tcl is unloaded. * * Results: * None. * * Side effects: * Resets the process list. * *---------------------------------------------------------------------- */ static void ProcExitHandler( ClientData clientData) /* Old window proc */ { Tcl_MutexLock(&pipeMutex); initialized = 0; Tcl_MutexUnlock(&pipeMutex); } /* *---------------------------------------------------------------------- * * PipeSetupProc -- * * This procedure is invoked before Tcl_DoOneEvent blocks waiting * for an event. * * Results: * None. * * Side effects: * Adjusts the block time if needed. * *---------------------------------------------------------------------- */ void PipeSetupProc( ClientData data, /* Not used. */ int flags) /* Event flags as passed to Tcl_DoOneEvent. */ { PipeInfo *infoPtr; Tcl_Time blockTime = { 0, 0 }; int block = 1; WinFile *filePtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return; } /* * Look to see if any events are already pending. If they are, poll. */ for (infoPtr = tsdPtr->firstPipePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->watchMask & TCL_WRITABLE) { filePtr = (WinFile*) infoPtr->writeFile; if (WaitForSingleObject(infoPtr->writable, 0) != WAIT_TIMEOUT) { block = 0; } } if (infoPtr->watchMask & TCL_READABLE) { filePtr = (WinFile*) infoPtr->readFile; if (WaitForRead(infoPtr, 0) >= 0) { block = 0; } } } if (!block) { Tcl_SetMaxBlockTime(&blockTime); } } /* *---------------------------------------------------------------------- * * PipeCheckProc -- * * This procedure is called by Tcl_DoOneEvent to check the pipe * event source for events. * * Results: * None. * * Side effects: * May queue an event. * *---------------------------------------------------------------------- */ static void PipeCheckProc( ClientData data, /* Not used. */ int flags) /* Event flags as passed to Tcl_DoOneEvent. */ { PipeInfo *infoPtr; PipeEvent *evPtr; WinFile *filePtr; int needEvent; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return; } /* * Queue events for any ready pipes that don't already have events * queued. */ for (infoPtr = tsdPtr->firstPipePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->flags & PIPE_PENDING) { continue; } /* * Queue an event if the pipe is signaled for reading or writing. */ needEvent = 0; filePtr = (WinFile*) infoPtr->writeFile; if ((infoPtr->watchMask & TCL_WRITABLE) && (WaitForSingleObject(infoPtr->writable, 0) != WAIT_TIMEOUT)) { needEvent = 1; } filePtr = (WinFile*) infoPtr->readFile; if ((infoPtr->watchMask & TCL_READABLE) && (WaitForRead(infoPtr, 0) >= 0)) { needEvent = 1; } if (needEvent) { infoPtr->flags |= PIPE_PENDING; evPtr = (PipeEvent *) ckalloc(sizeof(PipeEvent)); evPtr->header.proc = PipeEventProc; evPtr->infoPtr = infoPtr; Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL); } } } /* *---------------------------------------------------------------------- * * TclWinMakeFile -- * * This function constructs a new TclFile from a given data and * type value. * * Results: * Returns a newly allocated WinFile as a TclFile. * * Side effects: * None. * *---------------------------------------------------------------------- */ TclFile TclWinMakeFile( HANDLE handle) /* Type-specific data. */ { WinFile *filePtr; filePtr = (WinFile *) ckalloc(sizeof(WinFile)); filePtr->type = WIN_FILE; filePtr->handle = handle; return (TclFile)filePtr; } /* *---------------------------------------------------------------------- * * TempFileName -- * * Gets a temporary file name and deals with the fact that the * temporary file path provided by Windows may not actually exist * if the TMP or TEMP environment variables refer to a * non-existent directory. * * Results: * 0 if error, non-zero otherwise. If non-zero is returned, the * name buffer will be filled with a name that can be used to * construct a temporary file. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int TempFileName(name) WCHAR name[MAX_PATH]; /* Buffer in which name for temporary * file gets stored. */ { TCHAR *prefix; prefix = (tclWinProcs->useWide) ? (TCHAR *) L"TCL" : (TCHAR *) "TCL"; if ((*tclWinProcs->getTempPathProc)(MAX_PATH, name) != 0) { if ((*tclWinProcs->getTempFileNameProc)((TCHAR *) name, prefix, 0, name) != 0) { return 1; } } if (tclWinProcs->useWide) { ((WCHAR *) name)[0] = '.'; ((WCHAR *) name)[1] = '\0'; } else { ((char *) name)[0] = '.'; ((char *) name)[1] = '\0'; } return (*tclWinProcs->getTempFileNameProc)((TCHAR *) name, prefix, 0, name); } /* *---------------------------------------------------------------------- * * TclpMakeFile -- * * Make a TclFile from a channel. * * Results: * Returns a new TclFile or NULL on failure. * * Side effects: * None. * *---------------------------------------------------------------------- */ TclFile TclpMakeFile(channel, direction) Tcl_Channel channel; /* Channel to get file from. */ int direction; /* Either TCL_READABLE or TCL_WRITABLE. */ { HANDLE handle; if (Tcl_GetChannelHandle(channel, direction, (ClientData *) &handle) == TCL_OK) { return TclWinMakeFile(handle); } else { return (TclFile) NULL; } } /* *---------------------------------------------------------------------- * * TclpOpenFile -- * * This function opens files for use in a pipeline. * * Results: * Returns a newly allocated TclFile structure containing the * file handle. * * Side effects: * None. * *---------------------------------------------------------------------- */ TclFile TclpOpenFile(path, mode) CONST char *path; /* The name of the file to open. */ int mode; /* In what mode to open the file? */ { HANDLE handle; DWORD accessMode, createMode, shareMode, flags; Tcl_DString ds; CONST TCHAR *nativePath; /* * Map the access bits to the NT access mode. */ switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) { case O_RDONLY: accessMode = GENERIC_READ; break; case O_WRONLY: accessMode = GENERIC_WRITE; break; case O_RDWR: accessMode = (GENERIC_READ | GENERIC_WRITE); break; default: TclWinConvertError(ERROR_INVALID_FUNCTION); return NULL; } /* * Map the creation flags to the NT create mode. */ switch (mode & (O_CREAT | O_EXCL | O_TRUNC)) { case (O_CREAT | O_EXCL): case (O_CREAT | O_EXCL | O_TRUNC): createMode = CREATE_NEW; break; case (O_CREAT | O_TRUNC): createMode = CREATE_ALWAYS; break; case O_CREAT: createMode = OPEN_ALWAYS; break; case O_TRUNC: case (O_TRUNC | O_EXCL): createMode = TRUNCATE_EXISTING; break; default: createMode = OPEN_EXISTING; break; } nativePath = Tcl_WinUtfToTChar(path, -1, &ds); /* * If the file is not being created, use the existing file attributes. */ flags = 0; if (!(mode & O_CREAT)) { flags = (*tclWinProcs->getFileAttributesProc)(nativePath); if (flags == 0xFFFFFFFF) { flags = 0; } } /* * Set up the file sharing mode. We want to allow simultaneous access. */ shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; /* * Now we get to create the file. */ handle = (*tclWinProcs->createFileProc)(nativePath, accessMode, shareMode, NULL, createMode, flags, NULL); Tcl_DStringFree(&ds); if (handle == INVALID_HANDLE_VALUE) { DWORD err; err = GetLastError(); if ((err & 0xffffL) == ERROR_OPEN_FAILED) { err = (mode & O_CREAT) ? ERROR_FILE_EXISTS : ERROR_FILE_NOT_FOUND; } TclWinConvertError(err); return NULL; } /* * Seek to the end of file if we are writing. */ if (mode & O_WRONLY) { SetFilePointer(handle, 0, NULL, FILE_END); } return TclWinMakeFile(handle); } /* *---------------------------------------------------------------------- * * TclpCreateTempFile -- * * This function opens a unique file with the property that it * will be deleted when its file handle is closed. The temporary * file is created in the system temporary directory. * * Results: * Returns a valid TclFile, or NULL on failure. * * Side effects: * Creates a new temporary file. * *---------------------------------------------------------------------- */ TclFile TclpCreateTempFile(contents) CONST char *contents; /* String to write into temp file, or NULL. */ { WCHAR name[MAX_PATH]; CONST char *native; Tcl_DString dstring; HANDLE handle; if (TempFileName(name) == 0) { return NULL; } handle = (*tclWinProcs->createFileProc)((TCHAR *) name, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY|FILE_FLAG_DELETE_ON_CLOSE, NULL); if (handle == INVALID_HANDLE_VALUE) { goto error; } /* * Write the file out, doing line translations on the way. */ if (contents != NULL) { DWORD result, length; CONST char *p; /* * Convert the contents from UTF to native encoding */ native = Tcl_UtfToExternalDString(NULL, contents, -1, &dstring); for (p = native; *p != '\0'; p++) { if (*p == '\n') { length = p - native; if (length > 0) { if (!WriteFile(handle, native, length, &result, NULL)) { goto error; } } if (!WriteFile(handle, "\r\n", 2, &result, NULL)) { goto error; } native = p+1; } } length = p - native; if (length > 0) { if (!WriteFile(handle, native, length, &result, NULL)) { goto error; } } Tcl_DStringFree(&dstring); if (SetFilePointer(handle, 0, NULL, FILE_BEGIN) == 0xFFFFFFFF) { goto error; } } return TclWinMakeFile(handle); error: /* Free the native representation of the contents if necessary */ if (contents != NULL) { Tcl_DStringFree(&dstring); } TclWinConvertError(GetLastError()); CloseHandle(handle); (*tclWinProcs->deleteFileProc)((TCHAR *) name); return NULL; } /* *---------------------------------------------------------------------- * * TclpTempFileName -- * * This function returns a unique filename. * * Results: * Returns a valid Tcl_Obj* with refCount 0, or NULL on failure. * * Side effects: * None. * *---------------------------------------------------------------------- */ Tcl_Obj* TclpTempFileName() { WCHAR fileName[MAX_PATH]; if (TempFileName(fileName) == 0) { return NULL; } return TclpNativeToNormalized((ClientData) fileName); } /* *---------------------------------------------------------------------- * * TclpCreatePipe -- * * Creates an anonymous pipe. * * Results: * Returns 1 on success, 0 on failure. * * Side effects: * Creates a pipe. * *---------------------------------------------------------------------- */ int TclpCreatePipe( TclFile *readPipe, /* Location to store file handle for * read side of pipe. */ TclFile *writePipe) /* Location to store file handle for * write side of pipe. */ { HANDLE readHandle, writeHandle; if (CreatePipe(&readHandle, &writeHandle, NULL, 0) != 0) { *readPipe = TclWinMakeFile(readHandle); *writePipe = TclWinMakeFile(writeHandle); return 1; } TclWinConvertError(GetLastError()); return 0; } /* *---------------------------------------------------------------------- * * TclpCloseFile -- * * Closes a pipeline file handle. These handles are created by * TclpOpenFile, TclpCreatePipe, or TclpMakeFile. * * Results: * 0 on success, -1 on failure. * * Side effects: * The file is closed and deallocated. * *---------------------------------------------------------------------- */ int TclpCloseFile( TclFile file) /* The file to close. */ { WinFile *filePtr = (WinFile *) file; switch (filePtr->type) { case WIN_FILE: /* * Don't close the Win32 handle if the handle is a standard channel * during the thread exit process. Otherwise, one thread may kill * the stdio of another. */ if (!TclInThreadExit() || ((GetStdHandle(STD_INPUT_HANDLE) != filePtr->handle) && (GetStdHandle(STD_OUTPUT_HANDLE) != filePtr->handle) && (GetStdHandle(STD_ERROR_HANDLE) != filePtr->handle))) { if (filePtr->handle != NULL && CloseHandle(filePtr->handle) == FALSE) { TclWinConvertError(GetLastError()); ckfree((char *) filePtr); return -1; } } break; default: panic("TclpCloseFile: unexpected file type"); } ckfree((char *) filePtr); return 0; } /* *-------------------------------------------------------------------------- * * TclpGetPid -- * * Given a HANDLE to a child process, return the process id for that * child process. * * Results: * Returns the process id for the child process. If the pid was not * known by Tcl, either because the pid was not created by Tcl or the * child process has already been reaped, -1 is returned. * * Side effects: * None. * *-------------------------------------------------------------------------- */ unsigned long TclpGetPid( Tcl_Pid pid) /* The HANDLE of the child process. */ { ProcInfo *infoPtr; Tcl_MutexLock(&pipeMutex); for (infoPtr = procList; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->hProcess == (HANDLE) pid) { Tcl_MutexUnlock(&pipeMutex); return infoPtr->dwProcessId; } } Tcl_MutexUnlock(&pipeMutex); return (unsigned long) -1; } /* *---------------------------------------------------------------------- * * TclpCreateProcess -- * * Create a child process that has the specified files as its * standard input, output, and error. The child process runs * asynchronously under Windows NT and Windows 9x, and runs * with the same environment variables as the creating process. * * The complete Windows search path is searched to find the specified * executable. If an executable by the given name is not found, * automatically tries appending ".com", ".exe", and ".bat" to the * executable name. * * Results: * The return value is TCL_ERROR and an error message is left in * the interp's result if there was a problem creating the child * process. Otherwise, the return value is TCL_OK and *pidPtr is * filled with the process id of the child process. * * Side effects: * A process is created. * *---------------------------------------------------------------------- */ int TclpCreateProcess( Tcl_Interp *interp, /* Interpreter in which to leave errors that * occurred when creating the child process. * Error messages from the child process * itself are sent to errorFile. */ int argc, /* Number of arguments in following array. */ CONST char **argv, /* Array of argument strings. argv[0] * contains the name of the executable * converted to native format (using the * Tcl_TranslateFileName call). Additional * arguments have not been converted. */ TclFile inputFile, /* If non-NULL, gives the file to use as * input for the child process. If inputFile * file is not readable or is NULL, the child * will receive no standard input. */ TclFile outputFile, /* If non-NULL, gives the file that * receives output from the child process. If * outputFile file is not writeable or is * NULL, output from the child will be * discarded. */ TclFile errorFile, /* If non-NULL, gives the file that * receives errors from the child process. If * errorFile file is not writeable or is NULL, * errors from the child will be discarded. * errorFile may be the same as outputFile. */ Tcl_Pid *pidPtr) /* If this procedure is successful, pidPtr * is filled with the process id of the child * process. */ { int result, applType, createFlags; Tcl_DString cmdLine; /* Complete command line (TCHAR). */ STARTUPINFOA startInfo; PROCESS_INFORMATION procInfo; SECURITY_ATTRIBUTES secAtts; HANDLE hProcess, h, inputHandle, outputHandle, errorHandle; char execPath[MAX_PATH * TCL_UTF_MAX]; WinFile *filePtr; PipeInit(); applType = ApplicationType(interp, argv[0], execPath); if (applType == APPL_NONE) { return TCL_ERROR; } result = TCL_ERROR; Tcl_DStringInit(&cmdLine); hProcess = GetCurrentProcess(); /* * STARTF_USESTDHANDLES must be used to pass handles to child process. * Using SetStdHandle() and/or dup2() only works when a console mode * parent process is spawning an attached console mode child process. */ ZeroMemory(&startInfo, sizeof(startInfo)); startInfo.cb = sizeof(startInfo); startInfo.dwFlags = STARTF_USESTDHANDLES; startInfo.hStdInput = INVALID_HANDLE_VALUE; startInfo.hStdOutput= INVALID_HANDLE_VALUE; startInfo.hStdError = INVALID_HANDLE_VALUE; secAtts.nLength = sizeof(SECURITY_ATTRIBUTES); secAtts.lpSecurityDescriptor = NULL; secAtts.bInheritHandle = TRUE; /* * We have to check the type of each file, since we cannot duplicate * some file types. */ inputHandle = INVALID_HANDLE_VALUE; if (inputFile != NULL) { filePtr = (WinFile *)inputFile; if (filePtr->type == WIN_FILE) { inputHandle = filePtr->handle; } } outputHandle = INVALID_HANDLE_VALUE; if (outputFile != NULL) { filePtr = (WinFile *)outputFile; if (filePtr->type == WIN_FILE) { outputHandle = filePtr->handle; } } errorHandle = INVALID_HANDLE_VALUE; if (errorFile != NULL) { filePtr = (WinFile *)errorFile; if (filePtr->type == WIN_FILE) { errorHandle = filePtr->handle; } } /* * Duplicate all the handles which will be passed off as stdin, stdout * and stderr of the child process. The duplicate handles are set to * be inheritable, so the child process can use them. */ if (inputHandle == INVALID_HANDLE_VALUE) { /* * If handle was not set, stdin should return immediate EOF. * Under Windows95, some applications (both 16 and 32 bit!) * cannot read from the NUL device; they read from console * instead. When running tk, this is fatal because the child * process would hang forever waiting for EOF from the unmapped * console window used by the helper application. * * Fortunately, the helper application detects a closed pipe * as an immediate EOF and can pass that information to the * child process. */ if (CreatePipe(&startInfo.hStdInput, &h, &secAtts, 0) != FALSE) { CloseHandle(h); } } else { DuplicateHandle(hProcess, inputHandle, hProcess, &startInfo.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); } if (startInfo.hStdInput == INVALID_HANDLE_VALUE) { TclWinConvertError(GetLastError()); Tcl_AppendResult(interp, "couldn't duplicate input handle: ", Tcl_PosixError(interp), (char *) NULL); goto end; } if (outputHandle == INVALID_HANDLE_VALUE) { /* * If handle was not set, output should be sent to an infinitely * deep sink. Under Windows 95, some 16 bit applications cannot * have stdout redirected to NUL; they send their output to * the console instead. Some applications, like "more" or "dir /p", * when outputting multiple pages to the console, also then try and * read from the console to go the next page. When running tk, this * is fatal because the child process would hang forever waiting * for input from the unmapped console window used by the helper * application. * * Fortunately, the helper application will detect a closed pipe * as a sink. */ if ((TclWinGetPlatformId() == VER_PLATFORM_WIN32_WINDOWS) && (applType == APPL_DOS)) { if (CreatePipe(&h, &startInfo.hStdOutput, &secAtts, 0) != FALSE) { CloseHandle(h); } } else { startInfo.hStdOutput = CreateFileA("NUL:", GENERIC_WRITE, 0, &secAtts, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); } } else { DuplicateHandle(hProcess, outputHandle, hProcess, &startInfo.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); } if (startInfo.hStdOutput == INVALID_HANDLE_VALUE) { TclWinConvertError(GetLastError()); Tcl_AppendResult(interp, "couldn't duplicate output handle: ", Tcl_PosixError(interp), (char *) NULL); goto end; } if (errorHandle == INVALID_HANDLE_VALUE) { /* * If handle was not set, errors should be sent to an infinitely * deep sink. */ startInfo.hStdError = CreateFileA("NUL:", GENERIC_WRITE, 0, &secAtts, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); } else { DuplicateHandle(hProcess, errorHandle, hProcess, &startInfo.hStdError, 0, TRUE, DUPLICATE_SAME_ACCESS); } if (startInfo.hStdError == INVALID_HANDLE_VALUE) { TclWinConvertError(GetLastError()); Tcl_AppendResult(interp, "couldn't duplicate error handle: ", Tcl_PosixError(interp), (char *) NULL); goto end; } /* * If we do not have a console window, then we must run DOS and * WIN32 console mode applications as detached processes. This tells * the loader that the child application should not inherit the * console, and that it should not create a new console window for * the child application. The child application should get its stdio * from the redirection handles provided by this application, and run * in the background. * * If we are starting a GUI process, they don't automatically get a * console, so it doesn't matter if they are started as foreground or * detached processes. The GUI window will still pop up to the * foreground. */ if (TclWinGetPlatformId() == VER_PLATFORM_WIN32_NT) { if (HasConsole()) { createFlags = CREATE_NEW_PROCESS_GROUP; } else if (applType == APPL_DOS) { /* * Under NT, 16-bit DOS applications will not run unless they * can be attached to a console. If we are running without a * console, run the 16-bit program as an normal process inside * of a hidden console application, and then run that hidden * console as a detached process. */ startInfo.wShowWindow = SW_HIDE; startInfo.dwFlags |= STARTF_USESHOWWINDOW; createFlags = CREATE_NEW_CONSOLE; Tcl_DStringAppend(&cmdLine, "cmd.exe /c ", -1); } else { createFlags = DETACHED_PROCESS; } } else { if (HasConsole()) { createFlags = CREATE_NEW_PROCESS_GROUP; } else { createFlags = DETACHED_PROCESS; } if (applType == APPL_DOS) { /* * Under Windows 95, 16-bit DOS applications do not work well * with pipes: * * 1. EOF on a pipe between a detached 16-bit DOS application * and another application is not seen at the other * end of the pipe, so the listening process blocks forever on * reads. This inablity to detect EOF happens when either a * 16-bit app or the 32-bit app is the listener. * * 2. If a 16-bit DOS application (detached or not) blocks when * writing to a pipe, it will never wake up again, and it * eventually brings the whole system down around it. * * The 16-bit application is run as a normal process inside * of a hidden helper console app, and this helper may be run * as a detached process. If any of the stdio handles is * a pipe, the helper application accumulates information * into temp files and forwards it to or from the DOS * application as appropriate. This means that DOS apps * must receive EOF from a stdin pipe before they will actually * begin, and must finish generating stdout or stderr before * the data will be sent to the next stage of the pipe. * * The helper app should be located in the same directory as * the tcl dll. */ if (createFlags != 0) { startInfo.wShowWindow = SW_HIDE; startInfo.dwFlags |= STARTF_USESHOWWINDOW; createFlags = CREATE_NEW_CONSOLE; } Tcl_DStringAppend(&cmdLine, "tclpip" STRINGIFY(TCL_MAJOR_VERSION) STRINGIFY(TCL_MINOR_VERSION) ".dll ", -1); } } /* * cmdLine gets the full command line used to invoke the executable, * including the name of the executable itself. The command line * arguments in argv[] are stored in cmdLine separated by spaces. * Special characters in individual arguments from argv[] must be * quoted when being stored in cmdLine. * * When calling any application, bear in mind that arguments that * specify a path name are not converted. If an argument contains * forward slashes as path separators, it may or may not be * recognized as a path name, depending on the program. In general, * most applications accept forward slashes only as option * delimiters and backslashes only as paths. * * Additionally, when calling a 16-bit dos or windows application, * all path names must use the short, cryptic, path format (e.g., * using ab~1.def instead of "a b.default"). */ BuildCommandLine(execPath, argc, argv, &cmdLine); if ((*tclWinProcs->createProcessProc)(NULL, (TCHAR *) Tcl_DStringValue(&cmdLine), NULL, NULL, TRUE, (DWORD) createFlags, NULL, NULL, &startInfo, &procInfo) == 0) { TclWinConvertError(GetLastError()); Tcl_AppendResult(interp, "couldn't execute \"", argv[0], "\": ", Tcl_PosixError(interp), (char *) NULL); goto end; } /* * This wait is used to force the OS to give some time to the DOS * process. */ if (applType == APPL_DOS) { WaitForSingleObject(procInfo.hProcess, 50); } /* * "When an application spawns a process repeatedly, a new thread * instance will be created for each process but the previous * instances may not be cleaned up. This results in a significant * virtual memory loss each time the process is spawned. If there * is a WaitForInputIdle() call between CreateProcess() and * CloseHandle(), the problem does not occur." PSS ID Number: Q124121 */ WaitForInputIdle(procInfo.hProcess, 5000); CloseHandle(procInfo.hThread); *pidPtr = (Tcl_Pid) procInfo.hProcess; if (*pidPtr != 0) { TclWinAddProcess(procInfo.hProcess, procInfo.dwProcessId); } result = TCL_OK; end: Tcl_DStringFree(&cmdLine); if (startInfo.hStdInput != INVALID_HANDLE_VALUE) { CloseHandle(startInfo.hStdInput); } if (startInfo.hStdOutput != INVALID_HANDLE_VALUE) { CloseHandle(startInfo.hStdOutput); } if (startInfo.hStdError != INVALID_HANDLE_VALUE) { CloseHandle(startInfo.hStdError); } return result; } /* *---------------------------------------------------------------------- * * HasConsole -- * * Determines whether the current application is attached to a * console. * * Results: * Returns TRUE if this application has a console, else FALSE. * * Side effects: * None. * *---------------------------------------------------------------------- */ static BOOL HasConsole() { HANDLE handle; handle = CreateFileA("CONOUT$", GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (handle != INVALID_HANDLE_VALUE) { CloseHandle(handle); return TRUE; } else { return FALSE; } } /* *-------------------------------------------------------------------- * * ApplicationType -- * * Search for the specified program and identify if it refers to a DOS, * Windows 3.X, or Win32 program. Used to determine how to invoke * a program, or if it can even be invoked. * * It is possible to almost positively identify DOS and Windows * applications that contain the appropriate magic numbers. However, * DOS .com files do not seem to contain a magic number; if the program * name ends with .com and could not be identified as a Windows .com * file, it will be assumed to be a DOS application, even if it was * just random data. If the program name does not end with .com, no * such assumption is made. * * The Win32 procedure GetBinaryType incorrectly identifies any * junk file that ends with .exe as a dos executable and some * executables that don't end with .exe as not executable. Plus it * doesn't exist under win95, so I won't feel bad about reimplementing * functionality. * * Results: * The return value is one of APPL_DOS, APPL_WIN3X, or APPL_WIN32 * if the filename referred to the corresponding application type. * If the file name could not be found or did not refer to any known * application type, APPL_NONE is returned and an error message is * left in interp. .bat files are identified as APPL_DOS. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int ApplicationType(interp, originalName, fullName) Tcl_Interp *interp; /* Interp, for error message. */ const char *originalName; /* Name of the application to find. */ char fullName[]; /* Filled with complete path to * application. */ { int applType, i, nameLen, found; HANDLE hFile; TCHAR *rest; char *ext; char buf[2]; DWORD attr, read; IMAGE_DOS_HEADER header; Tcl_DString nameBuf, ds; CONST TCHAR *nativeName; WCHAR nativeFullPath[MAX_PATH]; static char extensions[][5] = {"", ".com", ".exe", ".bat"}; /* Look for the program as an external program. First try the name * as it is, then try adding .com, .exe, and .bat, in that order, to * the name, looking for an executable. * * Using the raw SearchPath() procedure doesn't do quite what is * necessary. If the name of the executable already contains a '.' * character, it will not try appending the specified extension when * searching (in other words, SearchPath will not find the program * "a.b.exe" if the arguments specified "a.b" and ".exe"). * So, first look for the file as it is named. Then manually append * the extensions, looking for a match. */ applType = APPL_NONE; Tcl_DStringInit(&nameBuf); Tcl_DStringAppend(&nameBuf, originalName, -1); nameLen = Tcl_DStringLength(&nameBuf); for (i = 0; i < (int) (sizeof(extensions) / sizeof(extensions[0])); i++) { Tcl_DStringSetLength(&nameBuf, nameLen); Tcl_DStringAppend(&nameBuf, extensions[i], -1); nativeName = Tcl_WinUtfToTChar(Tcl_DStringValue(&nameBuf), Tcl_DStringLength(&nameBuf), &ds); found = (*tclWinProcs->searchPathProc)(NULL, nativeName, NULL, MAX_PATH, nativeFullPath, &rest); Tcl_DStringFree(&ds); if (found == 0) { continue; } /* * Ignore matches on directories or data files, return if identified * a known type. */ attr = (*tclWinProcs->getFileAttributesProc)((TCHAR *) nativeFullPath); if ((attr == 0xffffffff) || (attr & FILE_ATTRIBUTE_DIRECTORY)) { continue; } strcpy(fullName, Tcl_WinTCharToUtf((TCHAR *) nativeFullPath, -1, &ds)); Tcl_DStringFree(&ds); ext = strrchr(fullName, '.'); if ((ext != NULL) && (stricmp(ext, ".bat") == 0)) { applType = APPL_DOS; break; } hFile = (*tclWinProcs->createFileProc)((TCHAR *) nativeFullPath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile == INVALID_HANDLE_VALUE) { continue; } header.e_magic = 0; ReadFile(hFile, (void *) &header, sizeof(header), &read, NULL); if (header.e_magic != IMAGE_DOS_SIGNATURE) { /* * Doesn't have the magic number for relocatable executables. If * filename ends with .com, assume it's a DOS application anyhow. * Note that we didn't make this assumption at first, because some * supposed .com files are really 32-bit executables with all the * magic numbers and everything. */ CloseHandle(hFile); if ((ext != NULL) && (stricmp(ext, ".com") == 0)) { applType = APPL_DOS; break; } continue; } if (header.e_lfarlc != sizeof(header)) { /* * All Windows 3.X and Win32 and some DOS programs have this value * set here. If it doesn't, assume that since it already had the * other magic number it was a DOS application. */ CloseHandle(hFile); applType = APPL_DOS; break; } /* * The DWORD at header.e_lfanew points to yet another magic number. */ buf[0] = '\0'; SetFilePointer(hFile, header.e_lfanew, NULL, FILE_BEGIN); ReadFile(hFile, (void *) buf, 2, &read, NULL); CloseHandle(hFile); if ((buf[0] == 'N') && (buf[1] == 'E')) { applType = APPL_WIN3X; } else if ((buf[0] == 'P') && (buf[1] == 'E')) { applType = APPL_WIN32; } else { /* * Strictly speaking, there should be a test that there * is an 'L' and 'E' at buf[0..1], to identify the type as * DOS, but of course we ran into a DOS executable that * _doesn't_ have the magic number -- specifically, one * compiled using the Lahey Fortran90 compiler. */ applType = APPL_DOS; } break; } Tcl_DStringFree(&nameBuf); if (applType == APPL_NONE) { TclWinConvertError(GetLastError()); Tcl_AppendResult(interp, "couldn't execute \"", originalName, "\": ", Tcl_PosixError(interp), (char *) NULL); return APPL_NONE; } if ((applType == APPL_DOS) || (applType == APPL_WIN3X)) { /* * Replace long path name of executable with short path name for * 16-bit applications. Otherwise the application may not be able * to correctly parse its own command line to separate off the * application name from the arguments. */ (*tclWinProcs->getShortPathNameProc)((TCHAR *) nativeFullPath, nativeFullPath, MAX_PATH); strcpy(fullName, Tcl_WinTCharToUtf((TCHAR *) nativeFullPath, -1, &ds)); Tcl_DStringFree(&ds); } return applType; } /* *---------------------------------------------------------------------- * * BuildCommandLine -- * * The command line arguments are stored in linePtr separated * by spaces, in a form that CreateProcess() understands. Special * characters in individual arguments from argv[] must be quoted * when being stored in cmdLine. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void BuildCommandLine( CONST char *executable, /* Full path of executable (including * extension). Replacement for argv[0]. */ int argc, /* Number of arguments. */ CONST char **argv, /* Argument strings in UTF. */ Tcl_DString *linePtr) /* Initialized Tcl_DString that receives the * command line (TCHAR). */ { CONST char *arg, *start, *special; int quote, i; Tcl_DString ds; Tcl_DStringInit(&ds); /* * Prime the path. */ Tcl_DStringAppend(&ds, Tcl_DStringValue(linePtr), -1); for (i = 0; i < argc; i++) { if (i == 0) { arg = executable; } else { arg = argv[i]; Tcl_DStringAppend(&ds, " ", 1); } quote = 0; if (arg[0] == '\0') { quote = 1; } else { for (start = arg; *start != '\0'; start++) { if (isspace(*start)) { /* INTL: ISO space. */ quote = 1; break; } } } if (quote) { Tcl_DStringAppend(&ds, "\"", 1); } start = arg; for (special = arg; ; ) { if ((*special == '\\') && (special[1] == '\\' || special[1] == '"')) { Tcl_DStringAppend(&ds, start, special - start); start = special; while (1) { special++; if (*special == '"') { /* * N backslashes followed a quote -> insert * N * 2 + 1 backslashes then a quote. */ Tcl_DStringAppend(&ds, start, special - start); break; } if (*special != '\\') { break; } } Tcl_DStringAppend(&ds, start, special - start); start = special; } if (*special == '"') { Tcl_DStringAppend(&ds, start, special - start); Tcl_DStringAppend(&ds, "\\\"", 2); start = special + 1; } if (*special == '{') { Tcl_DStringAppend(&ds, start, special - start); Tcl_DStringAppend(&ds, "\\{", 2); start = special + 1; } if (*special == '\0') { break; } special++; } Tcl_DStringAppend(&ds, start, special - start); if (quote) { Tcl_DStringAppend(&ds, "\"", 1); } } Tcl_DStringFree(linePtr); Tcl_WinUtfToTChar(Tcl_DStringValue(&ds), Tcl_DStringLength(&ds), linePtr); Tcl_DStringFree(&ds); } /* *---------------------------------------------------------------------- * * TclpCreateCommandChannel -- * * This function is called by Tcl_OpenCommandChannel to perform * the platform specific channel initialization for a command * channel. * * Results: * Returns a new channel or NULL on failure. * * Side effects: * Allocates a new channel. * *---------------------------------------------------------------------- */ Tcl_Channel TclpCreateCommandChannel( TclFile readFile, /* If non-null, gives the file for reading. */ TclFile writeFile, /* If non-null, gives the file for writing. */ TclFile errorFile, /* If non-null, gives the file where errors * can be read. */ int numPids, /* The number of pids in the pid array. */ Tcl_Pid *pidPtr) /* An array of process identifiers. */ { char channelName[16 + TCL_INTEGER_SPACE]; int channelId; DWORD id; PipeInfo *infoPtr = (PipeInfo *) ckalloc((unsigned) sizeof(PipeInfo)); PipeInit(); infoPtr->watchMask = 0; infoPtr->flags = 0; infoPtr->readFlags = 0; infoPtr->readFile = readFile; infoPtr->writeFile = writeFile; infoPtr->errorFile = errorFile; infoPtr->numPids = numPids; infoPtr->pidPtr = pidPtr; infoPtr->writeBuf = 0; infoPtr->writeBufLen = 0; infoPtr->writeError = 0; /* * Use one of the fds associated with the channel as the * channel id. */ if (readFile) { channelId = (int) ((WinFile*)readFile)->handle; } else if (writeFile) { channelId = (int) ((WinFile*)writeFile)->handle; } else if (errorFile) { channelId = (int) ((WinFile*)errorFile)->handle; } else { channelId = 0; } infoPtr->validMask = 0; infoPtr->threadId = Tcl_GetCurrentThread(); if (readFile != NULL) { /* * Start the background reader thread. */ infoPtr->readable = CreateEvent(NULL, TRUE, TRUE, NULL); infoPtr->startReader = CreateEvent(NULL, FALSE, FALSE, NULL); infoPtr->stopReader = CreateEvent(NULL, TRUE, FALSE, NULL); infoPtr->readThread = CreateThread(NULL, 256, PipeReaderThread, infoPtr, 0, &id); SetThreadPriority(infoPtr->readThread, THREAD_PRIORITY_HIGHEST); infoPtr->validMask |= TCL_READABLE; } else { infoPtr->readThread = 0; } if (writeFile != NULL) { /* * Start the background writer thread. */ infoPtr->writable = CreateEvent(NULL, TRUE, TRUE, NULL); infoPtr->startWriter = CreateEvent(NULL, FALSE, FALSE, NULL); infoPtr->stopWriter = CreateEvent(NULL, TRUE, FALSE, NULL); infoPtr->writeThread = CreateThread(NULL, 256, PipeWriterThread, infoPtr, 0, &id); SetThreadPriority(infoPtr->readThread, THREAD_PRIORITY_HIGHEST); infoPtr->validMask |= TCL_WRITABLE; } /* * For backward compatibility with previous versions of Tcl, we * use "file%d" as the base name for pipes even though it would * be more natural to use "pipe%d". * Use the pointer to keep the channel names unique, in case * channels share handles (stdin/stdout). */ wsprintfA(channelName, "file%lx", infoPtr); infoPtr->channel = Tcl_CreateChannel(&pipeChannelType, channelName, (ClientData) infoPtr, infoPtr->validMask); /* * Pipes have AUTO translation mode on Windows and ^Z eof char, which * means that a ^Z will be appended to them at close. This is needed * for Windows programs that expect a ^Z at EOF. */ Tcl_SetChannelOption((Tcl_Interp *) NULL, infoPtr->channel, "-translation", "auto"); Tcl_SetChannelOption((Tcl_Interp *) NULL, infoPtr->channel, "-eofchar", "\032 {}"); return infoPtr->channel; } /* *---------------------------------------------------------------------- * * TclGetAndDetachPids -- * * Stores a list of the command PIDs for a command channel in * the interp's result. * * Results: * None. * * Side effects: * Modifies the interp's result. * *---------------------------------------------------------------------- */ void TclGetAndDetachPids( Tcl_Interp *interp, Tcl_Channel chan) { PipeInfo *pipePtr; Tcl_ChannelType *chanTypePtr; int i; char buf[TCL_INTEGER_SPACE]; /* * Punt if the channel is not a command channel. */ chanTypePtr = Tcl_GetChannelType(chan); if (chanTypePtr != &pipeChannelType) { return; } pipePtr = (PipeInfo *) Tcl_GetChannelInstanceData(chan); for (i = 0; i < pipePtr->numPids; i++) { wsprintfA(buf, "%lu", TclpGetPid(pipePtr->pidPtr[i])); Tcl_AppendElement(interp, buf); Tcl_DetachPids(1, &(pipePtr->pidPtr[i])); } if (pipePtr->numPids > 0) { ckfree((char *) pipePtr->pidPtr); pipePtr->numPids = 0; } } /* *---------------------------------------------------------------------- * * PipeBlockModeProc -- * * Set blocking or non-blocking mode on channel. * * Results: * 0 if successful, errno when failed. * * Side effects: * Sets the device into blocking or non-blocking mode. * *---------------------------------------------------------------------- */ static int PipeBlockModeProc( ClientData instanceData, /* Instance data for channel. */ int mode) /* TCL_MODE_BLOCKING or * TCL_MODE_NONBLOCKING. */ { PipeInfo *infoPtr = (PipeInfo *) instanceData; /* * Pipes on Windows can not be switched between blocking and nonblocking, * hence we have to emulate the behavior. This is done in the input * function by checking against a bit in the state. We set or unset the * bit here to cause the input function to emulate the correct behavior. */ if (mode == TCL_MODE_NONBLOCKING) { infoPtr->flags |= PIPE_ASYNC; } else { infoPtr->flags &= ~(PIPE_ASYNC); } return 0; } /* *---------------------------------------------------------------------- * * PipeClose2Proc -- * * Closes a pipe based IO channel. * * Results: * 0 on success, errno otherwise. * * Side effects: * Closes the physical channel. * *---------------------------------------------------------------------- */ static int PipeClose2Proc( ClientData instanceData, /* Pointer to PipeInfo structure. */ Tcl_Interp *interp, /* For error reporting. */ int flags) /* Flags that indicate which side to close. */ { PipeInfo *pipePtr = (PipeInfo *) instanceData; Tcl_Channel errChan; int errorCode, result; PipeInfo *infoPtr, **nextPtrPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); DWORD exitCode; errorCode = 0; if ((!flags || (flags == TCL_CLOSE_READ)) && (pipePtr->readFile != NULL)) { /* * Send the console group a notification of close. We assume * the child is a console application, and that it will respond. * It doesn't seem as though console mode applications that * don't set a HandlerRoutine acknowledge this. */ if (HasConsole() && pipePtr->numPids) { GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, TclpGetPid(pipePtr->pidPtr[0])); } /* * Clean up the background thread if necessary. Note that this * must be done before we can close the file, since the * thread may be blocking trying to read from the pipe. */ if (pipePtr->readThread) { /* * The thread may already have closed on it's own. Check it's * exit code. */ GetExitCodeThread(pipePtr->readThread, &exitCode); if (exitCode == STILL_ACTIVE) { /* * Set the stop event so that if the reader thread is blocked * in PipeReaderThread on WaitForMultipleEvents, it will exit * cleanly. */ SetEvent(pipePtr->stopReader); /* * Wait at most 20 milliseconds for the reader thread to close. */ if (WaitForSingleObject(pipePtr->readThread, 20) == WAIT_TIMEOUT) { /* * The thread must be blocked waiting for the pipe to * become readable in ReadFile(). There isn't a clean way * to exit the thread from this condition. We should * terminate the child process instead to get the reader * thread to fall out of ReadFile with a FALSE. (below) is * not the correct way to do this, but will stay here until * a better solution is found. * * Note that we need to guard against terminating the * thread while it is in the middle of Tcl_ThreadAlert * because it won't be able to release the notifier lock. */ Tcl_MutexLock(&pipeMutex); /* BUG: this leaks memory */ TerminateThread(pipePtr->readThread, 0); Tcl_MutexUnlock(&pipeMutex); } } CloseHandle(pipePtr->readThread); CloseHandle(pipePtr->readable); CloseHandle(pipePtr->startReader); CloseHandle(pipePtr->stopReader); pipePtr->readThread = NULL; } if (TclpCloseFile(pipePtr->readFile) != 0) { errorCode = errno; } pipePtr->validMask &= ~TCL_READABLE; pipePtr->readFile = NULL; } if ((!flags || (flags & TCL_CLOSE_WRITE)) && (pipePtr->writeFile != NULL)) { if (pipePtr->writeThread) { /* * Wait for the writer thread to finish the current buffer, * then terminate the thread and close the handles. If the * channel is nonblocking, there should be no pending write * operations. */ WaitForSingleObject(pipePtr->writable, INFINITE); /* * The thread may already have closed on it's own. Check it's * exit code. */ GetExitCodeThread(pipePtr->writeThread, &exitCode); if (exitCode == STILL_ACTIVE) { /* * Set the stop event so that if the reader thread is blocked * in PipeReaderThread on WaitForMultipleEvents, it will exit * cleanly. */ SetEvent(pipePtr->stopWriter); /* * Wait at most 20 milliseconds for the reader thread to close. */ if (WaitForSingleObject(pipePtr->writeThread, 20) == WAIT_TIMEOUT) { /* * The thread must be blocked waiting for the pipe to * consume input in WriteFile(). There isn't a clean way * to exit the thread from this condition. We should * terminate the child process instead to get the writer * thread to fall out of WriteFile with a FALSE. (below) is * not the correct way to do this, but will stay here until * a better solution is found. * * Note that we need to guard against terminating the * thread while it is in the middle of Tcl_ThreadAlert * because it won't be able to release the notifier lock. */ Tcl_MutexLock(&pipeMutex); /* BUG: this leaks memory */ TerminateThread(pipePtr->writeThread, 0); Tcl_MutexUnlock(&pipeMutex); } } CloseHandle(pipePtr->writeThread); CloseHandle(pipePtr->writable); CloseHandle(pipePtr->startWriter); CloseHandle(pipePtr->stopWriter); pipePtr->writeThread = NULL; } if (TclpCloseFile(pipePtr->writeFile) != 0) { if (errorCode == 0) { errorCode = errno; } } pipePtr->validMask &= ~TCL_WRITABLE; pipePtr->writeFile = NULL; } pipePtr->watchMask &= pipePtr->validMask; /* * Don't free the channel if any of the flags were set. */ if (flags) { return errorCode; } /* * Remove the file from the list of watched files. */ for (nextPtrPtr = &(tsdPtr->firstPipePtr), infoPtr = *nextPtrPtr; infoPtr != NULL; nextPtrPtr = &infoPtr->nextPtr, infoPtr = *nextPtrPtr) { if (infoPtr == (PipeInfo *)pipePtr) { *nextPtrPtr = infoPtr->nextPtr; break; } } /* * Wrap the error file into a channel and give it to the cleanup * routine. */ if (pipePtr->errorFile) { WinFile *filePtr; filePtr = (WinFile*)pipePtr->errorFile; errChan = Tcl_MakeFileChannel((ClientData) filePtr->handle, TCL_READABLE); ckfree((char *) filePtr); } else { errChan = NULL; } result = TclCleanupChildren(interp, pipePtr->numPids, pipePtr->pidPtr, errChan); if (pipePtr->numPids > 0) { ckfree((char *) pipePtr->pidPtr); } if (pipePtr->writeBuf != NULL) { ckfree(pipePtr->writeBuf); } ckfree((char*) pipePtr); if (errorCode == 0) { return result; } return errorCode; } /* *---------------------------------------------------------------------- * * PipeInputProc -- * * Reads input from the IO channel into the buffer given. Returns * count of how many bytes were actually read, and an error indication. * * Results: * A count of how many bytes were read is returned and an error * indication is returned in an output argument. * * Side effects: * Reads input from the actual channel. * *---------------------------------------------------------------------- */ static int PipeInputProc( ClientData instanceData, /* Pipe state. */ char *buf, /* Where to store data read. */ int bufSize, /* How much space is available * in the buffer? */ int *errorCode) /* Where to store error code. */ { PipeInfo *infoPtr = (PipeInfo *) instanceData; WinFile *filePtr = (WinFile*) infoPtr->readFile; DWORD count, bytesRead = 0; int result; *errorCode = 0; /* * Synchronize with the reader thread. */ result = WaitForRead(infoPtr, (infoPtr->flags & PIPE_ASYNC) ? 0 : 1); /* * If an error occurred, return immediately. */ if (result == -1) { *errorCode = errno; return -1; } if (infoPtr->readFlags & PIPE_EXTRABYTE) { /* * The reader thread consumed 1 byte as a side effect of * waiting so we need to move it into the buffer. */ *buf = infoPtr->extraByte; infoPtr->readFlags &= ~PIPE_EXTRABYTE; buf++; bufSize--; bytesRead = 1; /* * If further read attempts would block, return what we have. */ if (result == 0) { return bytesRead; } } /* * Attempt to read bufSize bytes. The read will return immediately * if there is any data available. Otherwise it will block until * at least one byte is available or an EOF occurs. */ if (ReadFile(filePtr->handle, (LPVOID) buf, (DWORD) bufSize, &count, (LPOVERLAPPED) NULL) == TRUE) { return bytesRead + count; } else if (bytesRead) { /* * Ignore errors if we have data to return. */ return bytesRead; } TclWinConvertError(GetLastError()); if (errno == EPIPE) { infoPtr->readFlags |= PIPE_EOF; return 0; } *errorCode = errno; return -1; } /* *---------------------------------------------------------------------- * * PipeOutputProc -- * * Writes the given output on the IO channel. Returns count of how * many characters were actually written, and an error indication. * * Results: * A count of how many characters were written is returned and an * error indication is returned in an output argument. * * Side effects: * Writes output on the actual channel. * *---------------------------------------------------------------------- */ static int PipeOutputProc( ClientData instanceData, /* Pipe state. */ CONST char *buf, /* The data buffer. */ int toWrite, /* How many bytes to write? */ int *errorCode) /* Where to store error code. */ { PipeInfo *infoPtr = (PipeInfo *) instanceData; WinFile *filePtr = (WinFile*) infoPtr->writeFile; DWORD bytesWritten, timeout; *errorCode = 0; timeout = (infoPtr->flags & PIPE_ASYNC) ? 0 : INFINITE; if (WaitForSingleObject(infoPtr->writable, timeout) == WAIT_TIMEOUT) { /* * The writer thread is blocked waiting for a write to complete * and the channel is in non-blocking mode. */ errno = EAGAIN; goto error; } /* * Check for a background error on the last write. */ if (infoPtr->writeError) { TclWinConvertError(infoPtr->writeError); infoPtr->writeError = 0; goto error; } if (infoPtr->flags & PIPE_ASYNC) { /* * The pipe is non-blocking, so copy the data into the output * buffer and restart the writer thread. */ if (toWrite > infoPtr->writeBufLen) { /* * Reallocate the buffer to be large enough to hold the data. */ if (infoPtr->writeBuf) { ckfree(infoPtr->writeBuf); } infoPtr->writeBufLen = toWrite; infoPtr->writeBuf = ckalloc((unsigned int) toWrite); } memcpy(infoPtr->writeBuf, buf, (size_t) toWrite); infoPtr->toWrite = toWrite; ResetEvent(infoPtr->writable); SetEvent(infoPtr->startWriter); bytesWritten = toWrite; } else { /* * In the blocking case, just try to write the buffer directly. * This avoids an unnecessary copy. */ if (WriteFile(filePtr->handle, (LPVOID) buf, (DWORD) toWrite, &bytesWritten, (LPOVERLAPPED) NULL) == FALSE) { TclWinConvertError(GetLastError()); goto error; } } return bytesWritten; error: *errorCode = errno; return -1; } /* *---------------------------------------------------------------------- * * PipeEventProc -- * * This function is invoked by Tcl_ServiceEvent when a file event * reaches the front of the event queue. This procedure invokes * Tcl_NotifyChannel on the pipe. * * Results: * Returns 1 if the event was handled, meaning it should be removed * from the queue. Returns 0 if the event was not handled, meaning * it should stay on the queue. The only time the event isn't * handled is if the TCL_FILE_EVENTS flag bit isn't set. * * Side effects: * Whatever the notifier callback does. * *---------------------------------------------------------------------- */ static int PipeEventProc( Tcl_Event *evPtr, /* Event to service. */ int flags) /* Flags that indicate what events to * handle, such as TCL_FILE_EVENTS. */ { PipeEvent *pipeEvPtr = (PipeEvent *)evPtr; PipeInfo *infoPtr; WinFile *filePtr; int mask; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return 0; } /* * Search through the list of watched pipes for the one whose handle * matches the event. We do this rather than simply dereferencing * the handle in the event so that pipes can be deleted while the * event is in the queue. */ for (infoPtr = tsdPtr->firstPipePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (pipeEvPtr->infoPtr == infoPtr) { infoPtr->flags &= ~(PIPE_PENDING); break; } } /* * Remove stale events. */ if (!infoPtr) { return 1; } /* * Check to see if the pipe is readable. Note * that we can't tell if a pipe is writable, so we always report it * as being writable unless we have detected EOF. */ filePtr = (WinFile*) ((PipeInfo*)infoPtr)->writeFile; mask = 0; if ((infoPtr->watchMask & TCL_WRITABLE) && (WaitForSingleObject(infoPtr->writable, 0) != WAIT_TIMEOUT)) { mask = TCL_WRITABLE; } filePtr = (WinFile*) ((PipeInfo*)infoPtr)->readFile; if ((infoPtr->watchMask & TCL_READABLE) && (WaitForRead(infoPtr, 0) >= 0)) { if (infoPtr->readFlags & PIPE_EOF) { mask = TCL_READABLE; } else { mask |= TCL_READABLE; } } /* * Inform the channel of the events. */ Tcl_NotifyChannel(infoPtr->channel, infoPtr->watchMask & mask); return 1; } /* *---------------------------------------------------------------------- * * PipeWatchProc -- * * Called by the notifier to set up to watch for events on this * channel. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void PipeWatchProc( ClientData instanceData, /* Pipe state. */ int mask) /* What events to watch for, OR-ed * combination of TCL_READABLE, * TCL_WRITABLE and TCL_EXCEPTION. */ { PipeInfo **nextPtrPtr, *ptr; PipeInfo *infoPtr = (PipeInfo *) instanceData; int oldMask = infoPtr->watchMask; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); /* * Since most of the work is handled by the background threads, * we just need to update the watchMask and then force the notifier * to poll once. */ infoPtr->watchMask = mask & infoPtr->validMask; if (infoPtr->watchMask) { Tcl_Time blockTime = { 0, 0 }; if (!oldMask) { infoPtr->nextPtr = tsdPtr->firstPipePtr; tsdPtr->firstPipePtr = infoPtr; } Tcl_SetMaxBlockTime(&blockTime); } else { if (oldMask) { /* * Remove the pipe from the list of watched pipes. */ for (nextPtrPtr = &(tsdPtr->firstPipePtr), ptr = *nextPtrPtr; ptr != NULL; nextPtrPtr = &ptr->nextPtr, ptr = *nextPtrPtr) { if (infoPtr == ptr) { *nextPtrPtr = ptr->nextPtr; break; } } } } } /* *---------------------------------------------------------------------- * * PipeGetHandleProc -- * * Called from Tcl_GetChannelHandle to retrieve OS handles from * inside a command pipeline based channel. * * Results: * Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if * there is no handle for the specified direction. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int PipeGetHandleProc( ClientData instanceData, /* The pipe state. */ int direction, /* TCL_READABLE or TCL_WRITABLE */ ClientData *handlePtr) /* Where to store the handle. */ { PipeInfo *infoPtr = (PipeInfo *) instanceData; WinFile *filePtr; if (direction == TCL_READABLE && infoPtr->readFile) { filePtr = (WinFile*) infoPtr->readFile; *handlePtr = (ClientData) filePtr->handle; return TCL_OK; } if (direction == TCL_WRITABLE && infoPtr->writeFile) { filePtr = (WinFile*) infoPtr->writeFile; *handlePtr = (ClientData) filePtr->handle; return TCL_OK; } return TCL_ERROR; } /* *---------------------------------------------------------------------- * * Tcl_WaitPid -- * * Emulates the waitpid system call. * * Results: * Returns 0 if the process is still alive, -1 on an error, or * the pid on a clean close. * * Side effects: * Unless WNOHANG is set and the wait times out, the process * information record will be deleted and the process handle * will be closed. * *---------------------------------------------------------------------- */ Tcl_Pid Tcl_WaitPid( Tcl_Pid pid, int *statPtr, int options) { ProcInfo *infoPtr, **prevPtrPtr; DWORD flags; Tcl_Pid result; DWORD ret; PipeInit(); /* * If no pid is specified, do nothing. */ if (pid == 0) { *statPtr = 0; return 0; } /* * Find the process on the process list. */ Tcl_MutexLock(&pipeMutex); prevPtrPtr = &procList; for (infoPtr = procList; infoPtr != NULL; prevPtrPtr = &infoPtr->nextPtr, infoPtr = infoPtr->nextPtr) { if (infoPtr->hProcess == (HANDLE) pid) { break; } } Tcl_MutexUnlock(&pipeMutex); /* * If the pid is not one of the processes we know about (we started it) * then do nothing. */ if (infoPtr == NULL) { *statPtr = 0; return 0; } /* * Officially "wait" for it to finish. We either poll (WNOHANG) or * wait for an infinite amount of time. */ if (options & WNOHANG) { flags = 0; } else { flags = INFINITE; } ret = WaitForSingleObject(infoPtr->hProcess, flags); if (ret == WAIT_TIMEOUT) { *statPtr = 0; if (options & WNOHANG) { return 0; } else { result = 0; } } else if (ret != WAIT_FAILED) { GetExitCodeProcess(infoPtr->hProcess, (DWORD*)statPtr); *statPtr = ((*statPtr << 8) & 0xff00); result = pid; } else { errno = ECHILD; *statPtr = ECHILD; result = (Tcl_Pid) -1; } /* * Remove the process from the process list and close the process handle. */ CloseHandle(infoPtr->hProcess); *prevPtrPtr = infoPtr->nextPtr; ckfree((char*)infoPtr); return result; } /* *---------------------------------------------------------------------- * * TclWinAddProcess -- * * Add a process to the process list so that we can use * Tcl_WaitPid on the process. * * Results: * None * * Side effects: * Adds the specified process handle to the process list so * Tcl_WaitPid knows about it. * *---------------------------------------------------------------------- */ void TclWinAddProcess(hProcess, id) HANDLE hProcess; /* Handle to process */ DWORD id; /* Global process identifier */ { ProcInfo *procPtr = (ProcInfo *) ckalloc(sizeof(ProcInfo)); procPtr->hProcess = hProcess; procPtr->dwProcessId = id; Tcl_MutexLock(&pipeMutex); procPtr->nextPtr = procList; procList = procPtr; Tcl_MutexUnlock(&pipeMutex); } /* *---------------------------------------------------------------------- * * Tcl_PidObjCmd -- * * This procedure is invoked to process the "pid" 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_PidObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *CONST *objv) /* Argument strings. */ { Tcl_Channel chan; Tcl_ChannelType *chanTypePtr; PipeInfo *pipePtr; int i; Tcl_Obj *resultPtr; char buf[TCL_INTEGER_SPACE]; if (objc > 2) { Tcl_WrongNumArgs(interp, 1, objv, "?channelId?"); return TCL_ERROR; } if (objc == 1) { resultPtr = Tcl_GetObjResult(interp); wsprintfA(buf, "%lu", (unsigned long) getpid()); Tcl_SetStringObj(resultPtr, buf, -1); } else { chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], NULL), NULL); if (chan == (Tcl_Channel) NULL) { return TCL_ERROR; } chanTypePtr = Tcl_GetChannelType(chan); if (chanTypePtr != &pipeChannelType) { return TCL_OK; } pipePtr = (PipeInfo *) Tcl_GetChannelInstanceData(chan); resultPtr = Tcl_GetObjResult(interp); for (i = 0; i < pipePtr->numPids; i++) { wsprintfA(buf, "%lu", TclpGetPid(pipePtr->pidPtr[i])); Tcl_ListObjAppendElement(/*interp*/ NULL, resultPtr, Tcl_NewStringObj(buf, -1)); } } return TCL_OK; } /* *---------------------------------------------------------------------- * * WaitForRead -- * * Wait until some data is available, the pipe is at * EOF or the reader thread is blocked waiting for data (if the * channel is in non-blocking mode). * * Results: * Returns 1 if pipe is readable. Returns 0 if there is no data * on the pipe, but there is buffered data. Returns -1 if an * error occurred. If an error occurred, the threads may not * be synchronized. * * Side effects: * Updates the shared state flags and may consume 1 byte of data * from the pipe. If no error occurred, the reader thread is * blocked waiting for a signal from the main thread. * *---------------------------------------------------------------------- */ static int WaitForRead( PipeInfo *infoPtr, /* Pipe state. */ int blocking) /* Indicates whether call should be * blocking or not. */ { DWORD timeout, count; HANDLE *handle = ((WinFile *) infoPtr->readFile)->handle; while (1) { /* * Synchronize with the reader thread. */ timeout = blocking ? INFINITE : 0; if (WaitForSingleObject(infoPtr->readable, timeout) == WAIT_TIMEOUT) { /* * The reader thread is blocked waiting for data and the channel * is in non-blocking mode. */ errno = EAGAIN; return -1; } /* * At this point, the two threads are synchronized, so it is safe * to access shared state. */ /* * If the pipe has hit EOF, it is always readable. */ if (infoPtr->readFlags & PIPE_EOF) { return 1; } /* * Check to see if there is any data sitting in the pipe. */ if (PeekNamedPipe(handle, (LPVOID) NULL, (DWORD) 0, (LPDWORD) NULL, &count, (LPDWORD) NULL) != TRUE) { TclWinConvertError(GetLastError()); /* * Check to see if the peek failed because of EOF. */ if (errno == EPIPE) { infoPtr->readFlags |= PIPE_EOF; return 1; } /* * Ignore errors if there is data in the buffer. */ if (infoPtr->readFlags & PIPE_EXTRABYTE) { return 0; } else { return -1; } } /* * We found some data in the pipe, so it must be readable. */ if (count > 0) { return 1; } /* * The pipe isn't readable, but there is some data sitting * in the buffer, so return immediately. */ if (infoPtr->readFlags & PIPE_EXTRABYTE) { return 0; } /* * There wasn't any data available, so reset the thread and * try again. */ ResetEvent(infoPtr->readable); SetEvent(infoPtr->startReader); } } /* *---------------------------------------------------------------------- * * PipeReaderThread -- * * This function runs in a separate thread and waits for input * to become available on a pipe. * * Results: * None. * * Side effects: * Signals the main thread when input become available. May * cause the main thread to wake up by posting a message. May * consume one byte from the pipe for each wait operation. Will * cause a memory leak of ~4k, if forcefully terminated with * TerminateThread(). * *---------------------------------------------------------------------- */ static DWORD WINAPI PipeReaderThread(LPVOID arg) { PipeInfo *infoPtr = (PipeInfo *)arg; HANDLE *handle = ((WinFile *) infoPtr->readFile)->handle; DWORD count, err; int done = 0; HANDLE wEvents[2]; DWORD waitResult; wEvents[0] = infoPtr->stopReader; wEvents[1] = infoPtr->startReader; while (!done) { /* * Wait for the main thread to signal before attempting to wait * on the pipe becoming readable. */ waitResult = WaitForMultipleObjects(2, wEvents, FALSE, INFINITE); if (waitResult != (WAIT_OBJECT_0 + 1)) { /* * The start event was not signaled. It might be the stop event * or an error, so exit. */ break; } /* * Try waiting for 0 bytes. This will block until some data is * available on NT, but will return immediately on Win 95. So, * if no data is available after the first read, we block until * we can read a single byte off of the pipe. */ if ((ReadFile(handle, NULL, 0, &count, NULL) == FALSE) || (PeekNamedPipe(handle, NULL, 0, NULL, &count, NULL) == FALSE)) { /* * The error is a result of an EOF condition, so set the * EOF bit before signalling the main thread. */ err = GetLastError(); if (err == ERROR_BROKEN_PIPE) { infoPtr->readFlags |= PIPE_EOF; done = 1; } else if (err == ERROR_INVALID_HANDLE) { break; } } else if (count == 0) { if (ReadFile(handle, &(infoPtr->extraByte), 1, &count, NULL) != FALSE) { /* * One byte was consumed as a side effect of waiting * for the pipe to become readable. */ infoPtr->readFlags |= PIPE_EXTRABYTE; } else { err = GetLastError(); if (err == ERROR_BROKEN_PIPE) { /* * The error is a result of an EOF condition, so set the * EOF bit before signalling the main thread. */ infoPtr->readFlags |= PIPE_EOF; done = 1; } else if (err == ERROR_INVALID_HANDLE) { break; } } } /* * Signal the main thread by signalling the readable event and * then waking up the notifier thread. */ SetEvent(infoPtr->readable); /* * Alert the foreground thread. Note that we need to treat this like * a critical section so the foreground thread does not terminate * this thread while we are holding a mutex in the notifier code. */ Tcl_MutexLock(&pipeMutex); Tcl_ThreadAlert(infoPtr->threadId); Tcl_MutexUnlock(&pipeMutex); } return 0; } /* *---------------------------------------------------------------------- * * PipeWriterThread -- * * This function runs in a separate thread and writes data * onto a pipe. * * Results: * Always returns 0. * * Side effects: * Signals the main thread when an output operation is completed. * May cause the main thread to wake up by posting a message. * *---------------------------------------------------------------------- */ static DWORD WINAPI PipeWriterThread(LPVOID arg) { PipeInfo *infoPtr = (PipeInfo *)arg; HANDLE *handle = ((WinFile *) infoPtr->writeFile)->handle; DWORD count, toWrite; char *buf; int done = 0; HANDLE wEvents[2]; DWORD waitResult; wEvents[0] = infoPtr->stopWriter; wEvents[1] = infoPtr->startWriter; while (!done) { /* * Wait for the main thread to signal before attempting to write. */ waitResult = WaitForMultipleObjects(2, wEvents, FALSE, INFINITE); if (waitResult != (WAIT_OBJECT_0 + 1)) { /* * The start event was not signaled. It might be the stop event * or an error, so exit. */ break; } buf = infoPtr->writeBuf; toWrite = infoPtr->toWrite; /* * Loop until all of the bytes are written or an error occurs. */ while (toWrite > 0) { if (WriteFile(handle, buf, toWrite, &count, NULL) == FALSE) { infoPtr->writeError = GetLastError(); done = 1; break; } else { toWrite -= count; buf += count; } } /* * Signal the main thread by signalling the writable event and * then waking up the notifier thread. */ SetEvent(infoPtr->writable); /* * Alert the foreground thread. Note that we need to treat this like * a critical section so the foreground thread does not terminate * this thread while we are holding a mutex in the notifier code. */ Tcl_MutexLock(&pipeMutex); Tcl_ThreadAlert(infoPtr->threadId); Tcl_MutexUnlock(&pipeMutex); } return 0; }