Module: Datadog::Kit::EnableCoreDumps

Defined in:
lib/datadog/kit/enable_core_dumps.rb

Overview

This helper is used to enable core dumps for the current Ruby app. This is useful when debugging native-level crashes.

It can be enabled simply by adding ‘require ’datadog/kit/enable_core_dumps’‘ to start of the app.

Class Method Summary collapse

Class Method Details

.call ⇒ Object 



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# File 'lib/datadog/kit/enable_core_dumps.rb', line 10

def self.call
  current_size, maximum_size = Process.getrlimit(:CORE)
  core_pattern =
    begin
      File.read('/proc/sys/kernel/core_pattern').strip
    rescue
      '(Could not open /proc/sys/kernel/core_pattern)'
    end

  enabled_status = "Maximum size: #{maximum_size} Output pattern: '#{core_pattern}'"

  if maximum_size <= 0
    Kernel.warn("[ddtrace] Could not enable core dumps on crash, maximum size is #{maximum_size} (disabled).")
    return
  elsif maximum_size == current_size
    Kernel.warn("[ddtrace] Core dumps already enabled, nothing to do. #{enabled_status}")
    return
  end

  begin
    Process.setrlimit(:CORE, maximum_size)
  rescue => e
    Kernel.warn(
      "[ddtrace] Failed to enable core dumps. Cause: #{e.class.name} #{e.message} " \
      "Location: #{Array(e.backtrace).first}"
    )
    return
  end

  if current_size == 0
    Kernel.warn("[ddtrace] Enabled core dumps. #{enabled_status}")
  else
    Kernel.warn("[ddtrace] Raised core dump limit. Old size: #{current_size} #{enabled_status}")
  end
end