When a login session ends, via explicit logout or network disconnection, all processes, including background processes, will by default be terminated, to prevent them from becoming orphan processes. The jobs command will list all processes associated with the current terminal and can be used to bring background processes into the foreground. Using the fg command will also reconnect standard input its parent terminal, bringing it into the foreground. The bg command can resume a suspended job (sending SIGCONT), running it in the background. Services snap-in for Microsoft Management Consoleįrom a Unix command line, a background process can be launched using the "&" operator.The three principal means of managing Windows services are: With Windows Vista, however, interactive services became deprecated and ceased operating properly, as a result of Windows Service Hardening. Since Windows services operate in the context of their own dedicated user accounts, they can operate when a user is not logged on.īefore Windows Vista, services installed as "interactive services" could interact with Windows desktop and show a graphical user interface. These Windows components are often associated with Host Process for Windows Services: svchost.exe. Windows NT operating systems include numerous services which run in context of three user accounts: System, Network Service and Local Service. Alternatively, they can be started manually or by an event. ![]() Windows services can be configured to start when the operating system starts, and to run in the background as long as Windows runs. A Windows service must conform to the interface rules and protocols of the Service Control Manager, the component responsible for managing Windows services. In Windows NT family of operating systems, a Windows service is a dedicated background process. Although background processes are typically used for purposes needing few resources, any process can be run in the background, and such a process will behave like any other process, with the exceptions given above. ![]() This more technical definition does not distinguish between whether or not the process can receive user intervention. The TGID identifies the control terminal of the process group.) This type of process is unable to receive keyboard signals from its parent terminal, and typically will not send output to that terminal. (The TGID of a process is the process ID of the process group leader that opened the terminal, which is typically the login shell. ![]() ![]() On a Unix or Unix-like system, a background process or job can be further identified as one whose process group ID differs from its terminal group ID (TGID). In Windows Vista and later, they are run in a separate session. Windows services, on the other hand, are started by Service Control Manager. The former are started just as any other program is started, e.g., via Start menu. On a Windows system, a background process is either a computer program that does not create a user interface, or a Windows service. Typical tasks for these processes include logging, system monitoring, scheduling, and user notification. A background process is a computer process that runs behind the scenes (i.e., in the background) and without user intervention.
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