dcf3013f75
* Mention optional settings * Mention removed settings * Add links to system requirements * markdownlint fixes * Remove trailing spaces * Mention boolean elements * Add preshutdown * Add `dev ps` command * Stop misleading * Why aren't you using Windows 10? * Add `stdoutPath`/`stderrPath` * Relative paths and the default working directory * Send a close message to Windows (GUI) apps * Use valid XML * Add `customize` and `dev kill` commands * Update README.md * Add commands * Fix spacing * Update installation.md * Update README.md
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Self-restarting Windows services
Restart from the spawned process
To support self-restarting services, winsw exposes WINSW_EXECUTABLE environment variable into the forked process,
which refers to the full path of WinSW.exe that's managing the service.
To restart the service from within, execute %WINSW_EXECUTABLE% restart!.
Note that you are invoking restart! command, not restart command.
This hidden command is a flavor of the restart operation,
where winsw creates another winsw process in a separate process group,
and restarts the service from there.
This additional indirection is necessary because WinSW will kill child processes recursively when it stops a service. Windows Service Control Manager (SCM) doesn't provide the restart operation as an atomic operation either, so winsw implements restart by a sequence of stop and start. The second winsw process in a separate process group ensures that winsw can survive this massacre to execute the start call.