Difference between revisions of "Services"
Steveice10 (talk | contribs) m (Add link to PublishAndGetSubscriber.) |
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Revision as of 02:04, 11 October 2015
Services are an abstraction of ports and are the commonly used way of inter-process communication outside of the kernel. While handles of regular ports are retrieved from svcConnectToPort, service handles are retrieved through the port srv: ("service manager").
When a service is registered, svcCreatePort is used without a port-name. This means that the port is inaccessible via the port SVCs outside of sm-module. See below for getting a session handle for sending commands to services.
Processes with PID less than or equal to the number of NATIVE_FIRM built-in modules (fs, sm, pm, pxi, ldr) have access to all services. This value is obtained from svcGetSystemInfo.
Attempting to use GetServiceSession with a service that the process has access to when that service isn't registered, results in svcSendSyncRequest never returning(the exact cause is unknown).
Service Manager Port "srv:"
| Command Header | Description |
|---|---|
| 0x00010002 | Initialize |
| 0x00020000 | GetNotificationSemaphore |
| 0x00030100 | RegisterService |
| 0x000400C0 | UnregisterService |
| 0x00050100 | GetServiceSession |
| 0x000600C2 | RegisterPort |
| 0x000700C0 | UnregisterPort |
| 0x00080100 | GetPort |
| 0x00090040 | Subscribe |
| 0x000A0040 | Unsubscribe |
| 0x000B0000 | ReceiveNotification |
| 0x000C0080 | PublishToSubscriber |
| 0x000D0040 | PublishAndGetSubscriber |
| 0x000E00C0 | HasAccessToService |
Service Manager Process-Manager Port "srv:pm"
| Command Header, prior to 7.0.0-13 | Command Header | Description |
|---|---|---|
| 0x04010042 | 0x00010042 | PublishToProcess |
| 0x04020040 | 0x00020040 | PublishToAll |
| 0x04030082 | 0x00030082 | RegisterProcess |
| 0x04040040 | 0x00040040 | UnregisterProcess |
Prior to to 7.0.0-13, the commands listed for "srv:" were also accessible under this port with the same command-headers. Starting with 7.0.0-13, the "srv:pm" port was changed to a service. With this change, commandIDs for these commands were changed. "srv:pm" was originally vulnerable, this was fixed with 7.0.0-13, see here. Originally any process could use "srv:pm", however starting with 7.0.0-13 only the built-in NATIVE_FIRM sysmodules have access to it. The only system title which uses "srv:pm" is the Process Manager.
Notifications
| ID | Description | ||
|---|---|---|---|
| 0x100 | This indicates that all processes must terminate: power-off, reboot, or FIRM-launch. | ||
| 0x104 | This indicates that the system is entering sleep mode. (PTM:NotifySleepPreparationComplete needed for this and the following?) | ||
| 0x105 | This indicates that the system has exited sleep mode. | ||
| 0x108 | error at boot? | 0x179 | ? |
| 0x202 | POWER button pressed | ||
| 0x204 | This indicates that the HOME button was pressed. | ||
| 0x205 | HOME button pressed | ||
| 0x207 | SD card inserted | ||
| 0x208 | Game cartridge inserted | ||
| 0x209 | SD card removed | ||
| 0x20A | Game cartridge removed | ||
| 0x20B | Game cartridge inserted or removed |