TMA (Target Manager Agent) acts as a debugging sysmodule for development kits. This system module is loaded in retail units, but remains unused.

These services are inaccessible on retail units. However, all System Applets have permission to access them (see NPDM#Service_Access_Control).

TMA makes a few sets of services available. One set (the "htc" family), is aimed around managing Host/Target Connections. "htc" allows orchestrating the switch<->pc connection, "htc:tenv" allows retrieving information about the target's environment from the host, and "htcs" provides an interface for managing sockets on PC from the Switch. htcs is used primarily to host services on PC ports with actual management code running on Switch. The other service ("file_io") manages HostIO, a mechanism by which the Switch can read files present on the Host PC. When a host is connected, FS will attempt to read data via file_io when @Host:/ content paths are used, or when fsp-srv->OpenHostFileSystem() is used to open an IFileSystem to the Host PC. Nintendo's implementation only supports Windows, and FS will explicitly check for the presence of a "C:/" drive to detect this.

htc

This is "nn::tma::IHtcManager".

Cmd	Name
0	GetEnvironmentVariable
1	GetEnvironmentVariableLength
2	BindHostConnectionEvent
3	BindHostDisconnectionEvent
4	BindHostConnectionEventForSystem
5	BindHostDisconnectionEventForSystem
6	[3.0.0+] GetBridgeIpAddress
7	[3.0.0+] GetBridgePort
8	[3.0.0+] SetCradleAttached
9	[4.0.0+] GetBridgeSubnetMask
10	[4.0.0+] GetBridgeMacAddress
11	[6.0.0+] GetWorkingDirectoryPath
12	[6.0.0+] GetWorkingDirectoryPathSize
13	[6.0.0+] RunOnHostStart
14	[9.0.0+] RunOnHostResults
21	[19.0.0+] BeginUpdateBridge
22	[19.0.0+] ContinueUpdateBridge
23	[19.0.0+] EndUpdateBridge
24	[19.0.0+] GetBridgeType

htcs

This is "nn::tma::IHtcsManager".

Cmd	Name
0	Socket
1	Close
2	Connect
3	Bind
4	Listen
5	Accept
6	Recv
7	Send
8	Shutdown
9	Fcntl
10	GetPeerNameAny
11	GetDefaultHostName
12	CreateSocketOld
13	CreateSocket
100	RegisterProcessId
101	MonitorManager

ISocket

This is "nn::tma::ISocket".

Cmd	Name
0	Close
1	Connect
2	Bind
3	Listen
4	Accept
5	Recv
6	Send
7	Shutdown
8	Fcntl

htc:tenv

This is "nn::htc::tenv::IServiceManager".

Cmd	Name
0	GetServiceInterface

IService

This is "nn::htc::tenv::IService".

Cmd	Name
0	GetVariable
1	GetVariableLength
2	WaitUntilVariableAvailable

file_io

This is "nn::tma::IFileManager".

This service is not normally present on retail units.

Cmd	Name
0	#OpenFile
1	#FileExists
2	#DeleteFile
3	#RenameFile
4	#GetIOType
5	#OpenDirectory
6	#DirectoryExists
7	#CreateDirectory
8	#DeleteDirectory
9	#RenameDirectory
10	#CreateFile
11	#GetFileTimeStamp
12	GetCaseSensitivePath

OpenFile

Takes in an input X descriptor "Path" and a u32 "OpenMode", returns a #IFileAccessor interface.

FileExists

Takes in an input X descriptor "Path", and returns an output bool.

DeleteFile

Takes in an input X descriptor "Path".

RenameFile

Takes in an input X descriptor "SrcPath" and an input X descriptor "DstPath".

GetIOType

Takes in an input X descriptor "Path", returns an output int "EntryType".

OpenDirectory

Takes in an input X descriptor "Path" and a u32 "OpenMode", returns a #IDirectoryAccessor interface.

DirectoryExists

Takes in an input X descriptor "Path", and returns an output bool.

CreateDirectory

Takes in an input X descriptor "Path".

DeleteDirectory

Takes in an input X descriptor "Path" and an input bool "IsRecursive".

RenameDirectory

Takes in an input X descriptor "SrcPath" and an input X descriptor "DstPath".

CreateFile

Takes in an input X descriptor "Path" and an input s64 "Size".

GetFileTimeStamp

Takes in an input X descriptor "Path", and returns 3 output u64s ("CreatedTime", "AccessedTime", "ModifiedTime").

IFileAccessor

This is "nn::tma::IFileAccessor".

Cmd	Name
0	ReadFile
1	WriteFile
2	GetFileSize
3	SetFileSize
4	FlushFile
5	SetPriorityForFile
6	GetPriorityForFile

ReadFile

Takes in an input s64 "Offset", an input ReadOption, and a NonSecure B descriptor "OutBuffer", and returns a s64 "BytesRead".

WriteFile

Takes in an input s64 "Offset", an input WriteOption, and a NonSecure A descriptor "InBuffer".

GetFileSize

Takes no input, and returns a s64 "FileSize".

SetFileSize

Takes an s64 "FileSize".

FlushFile

Takes no input, returns no output.

SetPriorityForFile

Takes an input s32 "Priority".

GetPriorityForFile

Takes no input, returns an s32 "Priority".

IDirectoryAccessor

This is "nn::tma::IDirectoryAccessor".

Cmd	Name
0	#GetEntryCount
1	#ReadDirectory
2	#SetPriorityForDirectory
3	#GetPriorityForDirectory

GetEntryCount

Takes no input, returns an s64 "EntryCount".

ReadDirectory

Takes an input B descriptor "OutEntryBuffer", returns an s64 "NumEntriesRead"

SetPriorityForDirectory