Import Tcl 8.5.15 (as of svn r89086)

win/stub16.c

@@ -0,0 +1,195 @@
+/*
+ * stub16.c
+ *
+ *	A helper program used for running 16-bit DOS applications under
+ *	Windows 95.
+ *
+ * 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.
+ */
+
+#define STRICT
+
+#include <windows.h>
+#include <stdio.h>
+
+static HANDLE		CreateTempFile(void);
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * main
+ *
+ *	Entry point for the 32-bit console mode app used by Windows 95 to help
+ *	run the 16-bit program specified on the command line.
+ *
+ *	1. EOF on a pipe that connects a detached 16-bit process and a 32-bit
+ *	process is never seen. So, this process runs the 16-bit process
+ *	_attached_, and then it is run detached from the calling 32-bit
+ *	process.
+ *
+ *	2. If a 16-bit process blocks reading from or writing to a pipe, it
+ *	never wakes up, and eventually brings the whole system down with it if
+ *	you try to kill the process. This app simulates pipes. If any of the
+ *	stdio handles is a pipe, this program accumulates information into
+ *	temp files and forwards it to or from the DOS application as
+ *	appropriate. This means that this program must receive EOF from a
+ *	stdin pipe before it will actually start the DOS app, and the DOS app
+ *	must finish generating stdout or stderr before the data will be sent
+ *	to the next stage of the pipe. If the stdio handles are not pipes, no
+ *	accumulation occurs and the data is passed straight through to and
+ *	from the DOS application.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The child process is created and this process waits for it to
+ *	complete.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+int
+main(void)
+{
+    DWORD dwRead, dwWrite;
+    char *cmdLine;
+    HANDLE hStdInput, hStdOutput, hStdError;
+    HANDLE hFileInput, hFileOutput, hFileError;
+    STARTUPINFO si;
+    PROCESS_INFORMATION pi;
+    char buf[8192];
+    DWORD result;
+
+    hFileInput = INVALID_HANDLE_VALUE;
+    hFileOutput = INVALID_HANDLE_VALUE;
+    hFileError = INVALID_HANDLE_VALUE;
+    result = 1;
+
+    /*
+     * Don't get command line from argc, argv, because the command line
+     * tokenizer will have stripped off all the escape sequences needed for
+     * quotes and backslashes, and then we'd have to put them all back in
+     * again. Get the raw command line and parse off what we want ourselves.
+     * The command line should be of the form:
+     *
+     * stub16.exe program arg1 arg2 ...
+     */
+
+    cmdLine = strchr(GetCommandLine(), ' ');
+    if (cmdLine == NULL) {
+	return 1;
+    }
+    cmdLine++;
+
+    hStdInput = GetStdHandle(STD_INPUT_HANDLE);
+    hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
+    hStdError = GetStdHandle(STD_ERROR_HANDLE);
+
+    if (GetFileType(hStdInput) == FILE_TYPE_PIPE) {
+	hFileInput = CreateTempFile();
+	if (hFileInput == INVALID_HANDLE_VALUE) {
+	    goto cleanup;
+	}
+	while (ReadFile(hStdInput, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
+	    if (dwRead == 0) {
+		break;
+	    }
+	    if (WriteFile(hFileInput, buf, dwRead, &dwWrite, NULL) == FALSE) {
+		goto cleanup;
+	    }
+	}
+	SetFilePointer(hFileInput, 0, 0, FILE_BEGIN);
+	SetStdHandle(STD_INPUT_HANDLE, hFileInput);
+    }
+    if (GetFileType(hStdOutput) == FILE_TYPE_PIPE) {
+	hFileOutput = CreateTempFile();
+	if (hFileOutput == INVALID_HANDLE_VALUE) {
+	    goto cleanup;
+	}
+	SetStdHandle(STD_OUTPUT_HANDLE, hFileOutput);
+    }
+    if (GetFileType(hStdError) == FILE_TYPE_PIPE) {
+	hFileError = CreateTempFile();
+	if (hFileError == INVALID_HANDLE_VALUE) {
+	    goto cleanup;
+	}
+	SetStdHandle(STD_ERROR_HANDLE, hFileError);
+    }
+
+    ZeroMemory(&si, sizeof(si));
+    si.cb = sizeof(si);
+    if (CreateProcess(NULL, cmdLine, NULL, NULL, TRUE, 0, NULL, NULL, &si,
+	    &pi) == FALSE) {
+	goto cleanup;
+    }
+
+    WaitForInputIdle(pi.hProcess, 5000);
+    WaitForSingleObject(pi.hProcess, INFINITE);
+    GetExitCodeProcess(pi.hProcess, &result);
+    CloseHandle(pi.hProcess);
+    CloseHandle(pi.hThread);
+
+    if (hFileOutput != INVALID_HANDLE_VALUE) {
+	SetFilePointer(hFileOutput, 0, 0, FILE_BEGIN);
+	while (ReadFile(hFileOutput, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
+	    if (dwRead == 0) {
+		break;
+	    }
+	    if (WriteFile(hStdOutput, buf, dwRead, &dwWrite, NULL) == FALSE) {
+		break;
+	    }
+	}
+    }
+    if (hFileError != INVALID_HANDLE_VALUE) {
+	SetFilePointer(hFileError, 0, 0, FILE_BEGIN);
+	while (ReadFile(hFileError, buf, sizeof(buf), &dwRead, NULL) != FALSE) {
+	    if (dwRead == 0) {
+		break;
+	    }
+	    if (WriteFile(hStdError, buf, dwRead, &dwWrite, NULL) == FALSE) {
+		break;
+	    }
+	}
+    }
+
+  cleanup:
+    if (hFileInput != INVALID_HANDLE_VALUE) {
+	CloseHandle(hFileInput);
+    }
+    if (hFileOutput != INVALID_HANDLE_VALUE) {
+	CloseHandle(hFileOutput);
+    }
+    if (hFileError != INVALID_HANDLE_VALUE) {
+	CloseHandle(hFileError);
+    }
+    CloseHandle(hStdInput);
+    CloseHandle(hStdOutput);
+    CloseHandle(hStdError);
+    ExitProcess(result);
+    return 1;
+}
+
+static HANDLE
+CreateTempFile(void)
+{
+    char name[MAX_PATH];
+    SECURITY_ATTRIBUTES sa;
+
+    if (GetTempPath(sizeof(name), name) == 0) {
+	return INVALID_HANDLE_VALUE;
+    }
+    if (GetTempFileName(name, "tcl", 0, name) == 0) {
+	return INVALID_HANDLE_VALUE;
+    }
+
+    sa.nLength = sizeof(sa);
+    sa.lpSecurityDescriptor = NULL;
+    sa.bInheritHandle = TRUE;
+    return CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0, &sa,
+	    CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE,
+	    NULL);
+}