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<a id="pt-spec.txt-3.4"></a>
# Pluggable Transport Shutdown
The recommended way for Pluggable Transport using applications and
Pluggable Transports to handle graceful shutdown is as follows.
```text
- (Parent) Set "TOR_PT_EXIT_ON_STDIN_CLOSE" (3.2.1) when
launching the PT proxy, to indicate that stdin will be used
for graceful shutdown notification.
- (Parent) When the time comes to terminate the PT proxy:
1. Close the PT proxy's stdin.
2. Wait for a "reasonable" amount of time for the PT to exit.
3. Attempt to use OS specific mechanisms to cause graceful
PT shutdown (eg: 'SIGTERM')
4. Use OS specific mechanisms to force terminate the PT
(eg: 'SIGKILL', 'ProccessTerminate()').
- PT proxies SHOULD monitor stdin, and exit gracefully when
it is closed, if the parent supports that behavior.
- PT proxies SHOULD handle OS specific mechanisms to gracefully
terminate (eg: Install a signal handler on 'SIGTERM' that
causes cleanup and a graceful shutdown if able).
- PT proxies SHOULD attempt to detect when the parent has
terminated (eg: via detecting that its parent process ID has
changed on U*IX systems), and gracefully terminate.
```
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