SERVICE

SERVICE

Process
1. provide a service
2. rely Win API
3. Ever running
Components
1. Service App
2. Service Control Program
  1. Services.msc
3. Service Control Manager
How is create?
1. 1. El instalador del program debe registrar su servicio
  1. 2. Setup call a Advapi32.dll function
    1. CreateService
      1. Specify: Type (single,share), Path, Display Name, Account - context security, Startup Type(Manual,Automatic), Error Code (how react?)
    2. 3. A message is sended to SCM
      1. 4. SCM crea key in Registry
        HKLM\System\ CurrentControlSet\Services
        Save all parameters
        Annotations:
        Note The SCM does not access a service’s Parameters subkey until the service is deleted, at which time the SCM deletes the service’s entire key, including subkeys like Parameters.
How Start a service?
1. SCM send Start command
  1. Process main thread run StartServiceCtrlDispatcher
    1. Accet List of services point
      1. Named pipe communication to SCM
        Service thread
        Is Running?
        YES
        Call RegisterServiceCtrlHandler --> save the Service Control Handler in the main process
        Implemented for manage a lot of SCM commands
        Inicialyze SERVICE
        SCM ask its progress
        Service thread --> Loop waiting REQUESTS from CLIENT APPs
        NO
        Return to the main function
        Free resources before out

Resource summary

	Created by Alejandra Neolopan over 8 years ago