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General Environment Variables

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The following table lists the environment variables that can be used in both user-mode and kernel-mode debugging.

Variable Meaning

_NT_DEBUGGER_EXTENSION_PATH = Path

Specifies the path that the debugger will first search for extension DLLs. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;). For details, see Loading Debugger Extension DLLs.

_NT_EXECUTABLE_IMAGE_PATH = Path

Specifies the path containing the binary executable files. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;).This path is used in some situations such as user mode minidump files. For more information, see Setting Symbol and Executable Image Paths in WinDbg.

_NT_SOURCE_PATH = Path

Specifies the path containing the source files for the target. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;). For details, and for other ways to change this path, see Source Path.

_NT_SYMBOL_PATH = Path

Specifies the root of a directory tree containing the symbol files. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;). For details, and for other ways to change this path, see Symbol Path.

_NT_ALT_SYMBOL_PATH = Path

Specifies an alternate symbol path searched before _NT_SYMBOL_PATH. This is useful for keeping private versions of symbol files. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;). For details, see Symbol Path.

_NT_SYMBOL_PROXY = Proxy:Port

Specifies the proxy server to be used by SymSrv. For details, see Firewalls and Proxy Servers.

_NT_DEBUG_HISTORY_SIZE = Number

Specifies the number of commands in the command history that can be accessed during remote debugging. Because commands vary in length, the number of lines available may not exactly match Number.

_NT_DEBUG_LOG_FILE_OPEN = Filename

(CDB and KD only) Specifies the log file to which the debugger should send output.

_NT_DEBUG_LOG_FILE_APPEND = Filename

(CDB and KD only) Specifies the log file to which the debugger should append output.

_NT_EXPR_EVAL = {masm | c++}

Specifies the default expression evaluator. If masm is specified, MASM expression syntax will be used. If c++ is specified, C++ expression syntax will be used. MASM expression syntax is the default. See Evaluating Expressions for details.

_NO_DEBUG_HEAP

Specifies that the debug heap should not be used for user-mode debugging.

DBGENG_NO_DEBUG_PRIVILEGE

Prevents processes spawned by the debugger from inheriting SeDebugPrivilege.

DBGENG_NO_BUGCHECK_ANALYSIS

Prevents automated bugcheck analysis.

DBGHELP_HOMEDIR

Specifies the path for the root of the default downstream store used by SymSrv and SrcSrv. Path can contain a drive letter followed by a colon (:). Separate multiple directories with semicolons (;).

SRCSRV_INI_FILE

Specifies the path and name of the configuration file used by SrcSrv. By default, the path is the srcsrv subdirectory of the Debugging Tools for Windows installation directory, and the file name is Srcsrv.ini. See Source Indexing for details.