Current File : //proc/25810/root/usr/share/passenger/phusion_passenger/vendor/crash_watch/lldb_controller.rb
# encoding: binary
#
# Copyright (c) 2016-2017 Phusion Holding B.V.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
require 'rbconfig'
PhusionPassenger.require_passenger_lib 'vendor/crash_watch/base'
PhusionPassenger.require_passenger_lib 'vendor/crash_watch/utils'
module CrashWatch
class LldbNotFound < Error
end
class LldbController
class ExitInfo
attr_reader :exit_code, :signal, :backtrace, :snapshot
def initialize(exit_code, signal, backtrace, snapshot)
@exit_code = exit_code
@signal = signal
@backtrace = backtrace
@snapshot = snapshot
end
def signaled?
!!@signal
end
end
END_OF_RESPONSE_MARKER = '--------END_OF_RESPONSE--------'
attr_accessor :debug
def initialize
@pid, @in, @out = Utils.popen_command(find_lldb, "-x")
execute("settings set prompt 'LLDB:'")
execute("settings set auto-confirm false")
end
def execute(command_string, timeout = nil)
raise "LLDB session is already closed" if !@pid
puts "lldb write #{command_string.inspect}" if @debug
marker = "\n#{END_OF_RESPONSE_MARKER}\n"
@in.puts(command_string)
@in.puts("script print #{marker.inspect}")
done = false
result = []
while !done
begin
if select([@out], nil, nil, timeout)
line = @out.readline.chomp
line.sub!(/^LLDB:/, '')
puts "lldb read #{line.inspect}" if @debug
if line == "#{END_OF_RESPONSE_MARKER}"
done = true
else
result << line
end
else
close!
done = true
result = nil
end
rescue EOFError
done = true
end
end
if result
# Remove echo of the command string
result.slice!(0, 2)
# Remove echo of the marker print command
result.pop
result.pop
result.join("\n") << "\n"
else
nil
end
end
def closed?
!@pid
end
def close
if !closed?
begin
execute("process detach", 5) if !closed?
execute("quit", 5) if !closed?
rescue Errno::EPIPE
end
if !closed?
@in.close
@out.close
Process.waitpid(@pid)
@pid = nil
end
end
end
def close!
if !closed?
@in.close
@out.close
Process.kill('KILL', @pid)
Process.waitpid(@pid)
@pid = nil
end
end
def attach(pid)
pid = pid.to_s.strip
raise ArgumentError if pid.empty?
result = execute("attach -p #{pid}")
result !~ /(unable to attach|cannot attach)/
end
def program_counter
execute("p/x $pc").gsub(/.* = /, '')
end
def current_thread
execute("thread info") =~ /^thread #(.+?): /
$1
end
def current_thread_backtrace
execute("bt").strip
end
def all_threads_backtraces
execute("bt all").strip
end
private
def find_lldb
result = nil
if ENV['LLDB'] && File.executable?(ENV['LLDB'])
result = ENV['LLDB']
else
ENV['PATH'].to_s.split(/:+/).each do |path|
filename = "#{path}/lldb"
if File.file?(filename) && File.executable?(filename)
result = filename
break
end
end
end
puts "Found lldb at: #{result}" if result
if result.nil?
raise LldbNotFound
else
result
end
end
end
end
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