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We recently added support for handling SIGPIPE cleanly, in order to safely shutdown plugins in the event that the STDOUT/STDERR had been closed unexpectedly. Unfortunately, this signal is also emitted when writing to a closed socket connection: an event that occurs frequently for a webserver. Normally, if no signal handler is registered for same, the Go subsystem distinguishes the file descriptor and ignores those from the network. But once a handler is registered, all SIGPIPEs are passed through: and sadly there is no way to distinguish the original file descriptor. We don't strictly need the SIGPIPE handling for development any longer since `make stop-server` no longer shuts down the logrus process which explained the majority of hanging plugin processes. It remains suboptimal that a signal can terminate the server and leave plugin processes hanging, but the current symptoms are worse.
Mattermost is an open source, private cloud, Slack-alternative from https://mattermost.com.
It's written in Golang and React and runs as a single Linux binary with MySQL or PostgreSQL. Every month on the 16th a new compiled version is released under an MIT license.
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