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archie/tcl7.6/win/tclWinPipe.c

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Update tcl/tk for tcl-dp
2024-05-27 16:40:40 +02:00
/*
* tclWinPipe.c --
*
* This file implements the Windows-specific pipeline exec functions.
*
* Copyright (c) 1996 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.
*
* SCCS: @(#) tclWinPipe.c 1.32 96/10/11 17:39:22
*/
#include "tclWinInt.h"
#include <dos.h>
#include <fcntl.h>
#include <io.h>
#include <windows.h>
#include <sys/stat.h>
/*
* 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
/*
* This value indicates whether this module has been initialized.
*/
static int initialized = 0;
/*
* 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 = NULL;
/*
* Declarations for functions used only in this file.
*/
static int ApplicationType(Tcl_Interp *interp,
const char *fileName, char *fullName);
static void BuildCommandLine(int argc, char **argv,
Tcl_DString *linePtr);
static char * MakeTempFile(Tcl_DString *namePtr);
static void CopyFileByHandles(HANDLE dst, HANDLE src);
static BOOL HasConsole(void);
/*
*----------------------------------------------------------------------
*
* 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.
*
*----------------------------------------------------------------------
*/
int
Tcl_WaitPid(pid, statPtr, options)
pid_t pid;
int *statPtr;
int options;
{
ProcInfo *infoPtr, **prevPtrPtr;
int flags, result;
DWORD ret;
if (options & WNOHANG) {
flags = 0;
} else {
flags = INFINITE;
}
if (pid == 0) {
*statPtr = 0;
return 0;
}
/*
* Find the process on the process list.
*/
prevPtrPtr = &procList;
for (infoPtr = procList; infoPtr != NULL;
prevPtrPtr = &infoPtr->nextPtr, infoPtr = infoPtr->nextPtr) {
if (infoPtr->dwProcessId == (DWORD)pid) {
break;
}
}
if (infoPtr == NULL) {
return 0;
}
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;
result = -1;
}
/*
* Remove the process from the process list and close the process handle.
*/
CloseHandle(infoPtr->hProcess);
*prevPtrPtr = infoPtr->nextPtr;
ckfree((char*)infoPtr);
return result;
}
/*
*----------------------------------------------------------------------
*
* TclpCreateProcess --
*
* Create a child process that has the specified files as its
* standard input, output, and error. The child process runs
* synchronously under Win32s and asynchronously under Windows NT
* and Windows 95, 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
* interp->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(interp, argc, argv, inputFile, outputFile, errorFile,
inputFileName, outputFileName, errorFileName, pidPtr)
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. */
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. */
Tcl_File 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. */
Tcl_File 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. */
Tcl_File 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. */
char *inputFileName; /* If non-NULL, gives the name of the disk
* file that corresponds to inputFile. If
* NULL, then the name was not available
* because inputFile corresponds to a channel,
* pipe, socket, etc. */
char *outputFileName; /* If non-NULL, gives the name of the disk
* file that corresponds to outputFile. If
* NULL, then the name was not available
* because outputFile corresponds to a
* channel, pipe, socket, etc. */
char *errorFileName; /* If non-NULL, gives the name of the disk
* file that corresponds to errorFile. If
* NULL, then the name was not available
* because errorFile corresponds to a channel,
* pipe, socket, etc. */
int *pidPtr; /* If this procedure is successful, pidPtr
* is filled with the process id of the child
* process. */
{
int result, type, applType, createFlags;
Tcl_DString cmdLine;
STARTUPINFO startInfo;
PROCESS_INFORMATION procInfo;
SECURITY_ATTRIBUTES secAtts;
HANDLE hProcess, h, inputHandle, outputHandle, errorHandle;
char execPath[MAX_PATH];
char *originalName;
OSVERSIONINFO os;
os.dwOSVersionInfoSize = sizeof(os);
GetVersionEx(&os);
applType = ApplicationType(interp, argv[0], execPath);
if (applType == APPL_NONE) {
return TCL_ERROR;
}
originalName = argv[0];
argv[0] = execPath;
result = TCL_ERROR;
Tcl_DStringInit(&cmdLine);
if (os.dwPlatformId == VER_PLATFORM_WIN32s) {
/*
* Under Win32s, there are no pipes. In order to simulate pipe
* behavior, the child processes are run synchronously and their
* I/O is redirected from/to temporary files before the next
* stage of the pipeline is started.
*/
Tcl_DString inputTempFile, outputTempFile;
ClientData clientData;
TclWinPipe *pipePtr;
DWORD args[4];
void *trans[5];
DWORD status;
MSG msg;
BuildCommandLine(argc, argv, &cmdLine);
ZeroMemory(&startInfo, sizeof(startInfo));
startInfo.cb = sizeof(startInfo);
Tcl_DStringInit(&inputTempFile);
Tcl_DStringInit(&outputTempFile);
outputHandle = INVALID_HANDLE_VALUE;
if (inputFileName == NULL) {
if (inputFile != NULL) {
clientData = Tcl_GetFileInfo(inputFile, &type);
if (type == TCL_WIN_FILE) {
h = INVALID_HANDLE_VALUE;
inputFileName = MakeTempFile(&inputTempFile);
if (inputFileName != NULL) {
h = CreateFile(inputFileName, GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, 0, NULL);
}
if (h == INVALID_HANDLE_VALUE) {
Tcl_AppendResult(interp, "couldn't duplicate input handle: ",
Tcl_PosixError(interp), (char *) NULL);
goto end32s;
}
CopyFileByHandles(h, (HANDLE) clientData);
CloseHandle(h);
} else if (type == TCL_WIN32S_PIPE) {
pipePtr = (TclWinPipe *) clientData;
inputFileName = pipePtr->fileName;
}
}
if (inputFileName == NULL) {
inputFileName = "nul";
}
}
if (outputFileName == NULL) {
if (outputFile != NULL) {
clientData = Tcl_GetFileInfo(outputFile, &type);
if ((type >= TCL_WIN_PIPE) && (type <= TCL_WIN_CONSOLE)) {
outputFileName = MakeTempFile(&outputTempFile);
if (outputFileName == NULL) {
Tcl_AppendResult(interp, "couldn't duplicate output handle: ",
Tcl_PosixError(interp), (char *) NULL);
goto end32s;
}
outputHandle = (HANDLE) clientData;
} else if (type == TCL_WIN32S_PIPE) {
pipePtr = (TclWinPipe *) clientData;
outputFileName = pipePtr->fileName;
}
}
if (outputFileName == NULL) {
outputFileName = "nul";
}
}
if (applType == APPL_DOS) {
args[0] = (DWORD) Tcl_DStringValue(&cmdLine);
args[1] = (DWORD) inputFileName;
args[2] = (DWORD) outputFileName;
trans[0] = &args[0];
trans[1] = &args[1];
trans[2] = &args[2];
trans[3] = NULL;
if (TclSynchSpawn(args, 0, trans, pidPtr) != 0) {
result = TCL_OK;
}
} else if (applType == APPL_WIN3X) {
args[0] = (DWORD) Tcl_DStringValue(&cmdLine);
trans[0] = &args[0];
trans[1] = NULL;
if (TclSynchSpawn(args, 1, trans, pidPtr) != 0) {
result = TCL_OK;
}
} else {
if (CreateProcess(NULL, Tcl_DStringValue(&cmdLine), NULL, NULL,
FALSE, DETACHED_PROCESS, NULL, NULL, &startInfo,
&procInfo) != 0) {
CloseHandle(procInfo.hThread);
while (1) {
if (GetExitCodeProcess(procInfo.hProcess, &status) == FALSE) {
break;
}
if (status != STILL_ACTIVE) {
break;
}
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) == TRUE) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
*pidPtr = (int) procInfo.dwProcessId;
if (*pidPtr != 0) {
ProcInfo *procPtr = (ProcInfo *)ckalloc(sizeof(ProcInfo));
procPtr->hProcess = procInfo.hProcess;
procPtr->dwProcessId = procInfo.dwProcessId;
procPtr->nextPtr = procList;
procList = procPtr;
}
result = TCL_OK;
}
}
if (result != TCL_OK) {
TclWinConvertError(GetLastError());
Tcl_AppendResult(interp, "couldn't execute \"", originalName,
"\": ", Tcl_PosixError(interp), (char *) NULL);
}
end32s:
if (outputHandle != INVALID_HANDLE_VALUE) {
/*
* Now copy stuff from temp file to actual output handle. Don't
* close outputHandle because it is associated with the output
* file owned by the caller.
*/
h = CreateFile(outputFileName, GENERIC_READ, 0, NULL, OPEN_ALWAYS,
0, NULL);
if (h != INVALID_HANDLE_VALUE) {
CopyFileByHandles(outputHandle, h);
}
CloseHandle(h);
}
if (inputFileName == Tcl_DStringValue(&inputTempFile)) {
DeleteFile(inputFileName);
}
if (outputFileName == Tcl_DStringValue(&outputTempFile)) {
DeleteFile(outputFileName);
}
Tcl_DStringFree(&inputTempFile);
Tcl_DStringFree(&outputTempFile);
Tcl_DStringFree(&cmdLine);
return result;
}
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) {
h = (HANDLE) Tcl_GetFileInfo(inputFile, &type);
if ((type >= TCL_WIN_PIPE) && (type <= TCL_WIN_CONSOLE)) {
inputHandle = h;
}
}
outputHandle = INVALID_HANDLE_VALUE;
if (outputFile != NULL) {
h = (HANDLE) Tcl_GetFileInfo(outputFile, &type);
if ((type >= TCL_WIN_PIPE) && (type <= TCL_WIN_CONSOLE)) {
outputHandle = h;
}
}
errorHandle = INVALID_HANDLE_VALUE;
if (errorFile != NULL) {
h = (HANDLE) Tcl_GetFileInfo(errorFile, &type);
if ((type >= TCL_WIN_PIPE) && (type <= TCL_WIN_CONSOLE)) {
errorHandle = h;
}
}
/*
* 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 ((os.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
&& (applType == APPL_DOS)) {
if (CreatePipe(&h, &startInfo.hStdOutput, &secAtts, 0) != FALSE) {
CloseHandle(h);
}
} else {
startInfo.hStdOutput = CreateFile("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 = CreateFile("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 (os.dwPlatformId == VER_PLATFORM_WIN32_NT) {
if (HasConsole()) {
createFlags = 0;
} 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 = 0;
} 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(argc, argv, &cmdLine);
if (!CreateProcess(NULL, Tcl_DStringValue(&cmdLine), NULL, NULL, TRUE,
createFlags, NULL, NULL, &startInfo, &procInfo)) {
TclWinConvertError(GetLastError());
Tcl_AppendResult(interp, "couldn't execute \"", originalName,
"\": ", Tcl_PosixError(interp), (char *) NULL);
goto end;
}
if (applType == APPL_DOS) {
WaitForSingleObject(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 = (int) procInfo.dwProcessId;
if (*pidPtr != 0) {
ProcInfo *procPtr = (ProcInfo *)ckalloc(sizeof(ProcInfo));
procPtr->hProcess = procInfo.hProcess;
procPtr->dwProcessId = procInfo.dwProcessId;
procPtr->nextPtr = procList;
procList = procPtr;
}
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 = CreateFile("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;
}
}
/*
*----------------------------------------------------------------------
*
* TclCreatePipe --
*
* Creates an anonymous pipe. Under Win32s, creates a temp file
* that is used to simulate a pipe.
*
* Results:
* Returns 1 on success, 0 on failure.
*
* Side effects:
* Creates a pipe.
*
*----------------------------------------------------------------------
*/
int
TclCreatePipe(readPipe, writePipe)
Tcl_File *readPipe; /* Location to store file handle for
* read side of pipe. */
Tcl_File *writePipe; /* Location to store file handle for
* write side of pipe. */
{
HANDLE readHandle, writeHandle;
OSVERSIONINFO os;
if (CreatePipe(&readHandle, &writeHandle, NULL, 0) != 0) {
*readPipe = Tcl_GetFile((ClientData) readHandle, TCL_WIN_FILE);
*writePipe = Tcl_GetFile((ClientData) writeHandle, TCL_WIN_FILE);
return 1;
}
os.dwOSVersionInfoSize = sizeof(os);
GetVersionEx(&os);
if (os.dwPlatformId == VER_PLATFORM_WIN32s) {
TclWinPipe *readPipePtr, *writePipePtr;
char buf[MAX_PATH];
if ((GetTempPath(MAX_PATH, buf) != 0)
&& (GetTempFileName(buf, "TCL", 0, buf) != 0)) {
readPipePtr = (TclWinPipe *) ckalloc(sizeof(TclWinPipe));
writePipePtr = (TclWinPipe *) ckalloc(sizeof(TclWinPipe));
readPipePtr->otherPtr = writePipePtr;
readPipePtr->fileName = strcpy(ckalloc(strlen(buf) + 1), buf);
readPipePtr->fileHandle = INVALID_HANDLE_VALUE;
writePipePtr->otherPtr = readPipePtr;
writePipePtr->fileName = readPipePtr->fileName;
writePipePtr->fileHandle = INVALID_HANDLE_VALUE;
*readPipe = Tcl_GetFile((ClientData) readPipePtr, TCL_WIN32S_PIPE);
*writePipe = Tcl_GetFile((ClientData) writePipePtr, TCL_WIN32S_PIPE);
return 1;
}
}
TclWinConvertError(GetLastError());
return 0;
}
/*
*--------------------------------------------------------------------
*
* 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, fullPath)
Tcl_Interp *interp; /* Interp, for error message. */
const char *originalName; /* Name of the application to find. */
char fullPath[MAX_PATH]; /* Filled with complete path to
* application. */
{
int applType, i;
HANDLE hFile;
char *ext;
char buf[2];
DWORD read;
IMAGE_DOS_HEADER header;
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;
for (i = 0; i < (int) (sizeof(extensions) / sizeof(extensions[0])); i++) {
lstrcpyn(fullPath, originalName, MAX_PATH - 5);
lstrcat(fullPath, extensions[i]);
if (SearchPath(NULL, fullPath, NULL, MAX_PATH, fullPath, NULL) == 0) {
continue;
}
/*
* Ignore matches on directories or data files, return if identified
* a known type.
*/
if (GetFileAttributes(fullPath) & FILE_ATTRIBUTE_DIRECTORY) {
continue;
}
ext = strrchr(fullPath, '.');
if ((ext != NULL) && (strcmpi(ext, ".bat") == 0)) {
applType = APPL_DOS;
break;
}
hFile = CreateFile(fullPath, 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) && (strcmpi(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] == 'L') && (buf[1] == 'E')) {
applType = APPL_DOS;
} else if ((buf[0] == 'N') && (buf[1] == 'E')) {
applType = APPL_WIN3X;
} else if ((buf[0] == 'P') && (buf[1] == 'E')) {
applType = APPL_WIN32;
} else {
continue;
}
break;
}
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.
*/
GetShortPathName(fullPath, fullPath, MAX_PATH);
}
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(argc, argv, linePtr)
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
Tcl_DString *linePtr; /* Initialized Tcl_DString that receives the
* command line. */
{
char *start, *special;
int quote, i;
for (i = 0; i < argc; i++) {
if (i > 0) {
Tcl_DStringAppend(linePtr, " ", 1);
}
quote = 0;
for (start = argv[i]; *start != '\0'; start++) {
if (isspace(*start)) {
quote = 1;
Tcl_DStringAppend(linePtr, "\"", 1);
break;
}
}
start = argv[i];
for (special = argv[i]; ; ) {
if ((*special == '\\') &&
(special[1] == '\\' || special[1] == '"')) {
Tcl_DStringAppend(linePtr, 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(linePtr, start, special - start);
break;
}
if (*special != '\\') {
break;
}
}
Tcl_DStringAppend(linePtr, start, special - start);
start = special;
}
if (*special == '"') {
Tcl_DStringAppend(linePtr, start, special - start);
Tcl_DStringAppend(linePtr, "\\\"", 2);
start = special + 1;
}
if (*special == '\0') {
break;
}
special++;
}
Tcl_DStringAppend(linePtr, start, special - start);
if (quote) {
Tcl_DStringAppend(linePtr, "\"", 1);
}
}
}
/*
*----------------------------------------------------------------------
*
* MakeTempFile --
*
* Helper function for TclpCreateProcess under Win32s. Makes a
* temporary file that _won't_ go away automatically when it's file
* handle is closed. Used for simulated pipes, which are written
* in one pass and reopened and read in the next pass.
*
* Results:
* namePtr is filled with the name of the temporary file.
*
* Side effects:
* A temporary file with the name specified by namePtr is created.
* The caller is responsible for deleting this temporary file.
*
*----------------------------------------------------------------------
*/
static char *
MakeTempFile(namePtr)
Tcl_DString *namePtr; /* Initialized Tcl_DString that is filled
* with the name of the temporary file that
* was created. */
{
char name[MAX_PATH];
if ((GetTempPath(MAX_PATH, name) == 0)
|| (GetTempFileName(name, "TCL", 0, name) == 0)) {
return NULL;
}
Tcl_DStringAppend(namePtr, name, -1);
return Tcl_DStringValue(namePtr);
}
/*
*----------------------------------------------------------------------
*
* CopyFileByHandles --
*
* Helper function used by TclpCreateProcess under Win32s. Copies
* what remains of source file to destination file; source file
* pointer need not be positioned at the beginning of the file if
* all of source file is not desired, but data is copied up to end
* of source file.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
CopyFileByHandles(dst, src)
HANDLE dst; /* Destination file. */
HANDLE src; /* Source file. */
{
char buf[8192];
DWORD dwRead, dwWrite;
while (ReadFile(src, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
if (dwRead == 0) {
break;
}
if (WriteFile(dst, buf, dwRead, &dwWrite, NULL) == FALSE) {
break;
}
}
}
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