trap

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Published: Dec 9, 2022 License: Apache-2.0 Imports: 6 Imported by: 0

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func Trap

func Trap(cleanup func(), logger interface {
	Info(args ...interface{})
})

Trap sets up a simplified signal "trap", appropriate for common behavior expected from a vanilla unix command-line tool in general (and the Docker engine in particular).

  • If SIGINT or SIGTERM are received, `cleanup` is called, then the process is terminated.
  • If SIGINT or SIGTERM are received 3 times before cleanup is complete, then cleanup is skipped and the process is terminated immediately (allows force quit of stuck daemon)
  • A SIGQUIT always causes an exit without cleanup, with a goroutine dump preceding exit.
  • Ignore SIGPIPE events. These are generated by systemd when journald is restarted while the docker daemon is not restarted and also running under systemd. Fixes https://github.com/docker/docker/issues/19728

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