The behavior of different services can be determined from the value of
various subkeys in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\.
ErrorControl
REG_DWORDError constant
Error constant values:
- 0x3 Critical error. The attempted system startup fails. If not already
using LastKnownGood control set, then switch to LastKnownGood. If already
using LastKnownGood control set, then run a bug-check.
- 0x2 Severe error. If not already using LastKnownGood control set, then
switch to LastKnownGood. If already using LastKnownGood control set,
continue loading OS with error state.
- 0x1 Normal error. If driver doesn't load correctly, OS will continue
loading, but will display warning.
- 0x0 Ignore error. If driver doesn't load correctly, OS will continue
loading, but will not display warning.
GroupREG_DWORDGroup name
Group name value:
Specifies what group the service is a member of. Default is null.
DependOnGroupREG_DWORDGroup name
Group name value:
Specifies that at least one other member from the group must start first
before loading this service. Default is empty.
DependOnServiceREG_DWORDService name
Service name value:
Specifies which service(s) must start before this service starts. Default
is empty.
ImagePathREG_DWORDPath or filename
Path or filename value:
Specifies a path for the driver or service. Default for a driver is
systemroot\system32\drivers\drivername.sys. Default for a service is
systemroot\system32\servicename.exe.
TypeREG_DWORDType constant
Type constant values:
- 0x1: Kernel device driver.
- 0x2: Both a file system driver and a kernel device driver.
- 0x4: Set of arguments for an adapter.
- 0x10: Win32 program that is started by the Service Controller and runs as a
stand-alone process.
- 0x20: A Win32 service that can share a process with other Win32 services.
ObjectNameREG_DWORDObject name
Object name value:
If type is a Win32 service, this is the account name the service will use
to log on. If type is a kernel or file system driver, this is the driver
object name that the I/O manager uses to reference the driver.
StartREG_DWORDStart constant
Start constant values:
- 0x0 Boot. Needs to be loaded by the boot loader.
- 0x1: System. Needs to be loaded at kernel initialization.
- 0x2: Auto load. Needs to be started automatically.
- 0x3: Load on demand. Can be started manually.
- 0x4: Disabled. Should not be started.
TagREG_DWORDTag order constant.
Tag order constant value:
Indicates the order that services need to start within a given group.
