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# -*- coding: us-ascii -*-
# frozen_string_literal: false
require 'test/unit'
require 'tempfile'
if Process.euid == 0
ok = true
elsif (sudo = ENV["SUDO"]) and !sudo.empty? and (`#{sudo} echo ok` rescue false)
ok = true
else
ok = false
end
impl = :dtrace
# GNU/Linux distros with Systemtap support allows unprivileged users
# in the stapusr and statdev groups to work.
if RUBY_PLATFORM =~ /linux/
impl = :stap
begin
require 'etc'
ok = (%w[stapusr stapdev].map {|g|(Etc.getgrnam(g) || raise(ArgumentError)).gid} & Process.groups).size == 2
rescue LoadError, ArgumentError
end unless ok
end
if ok
case RUBY_PLATFORM
when /darwin/i
begin
require 'pty'
rescue LoadError
end
end
end
# use miniruby to reduce the amount of trace data we don't care about
rubybin = "miniruby#{RbConfig::CONFIG["EXEEXT"]}"
rubybin = File.join(File.dirname(EnvUtil.rubybin), rubybin)
rubybin = EnvUtil.rubybin unless File.executable?(rubybin)
# make sure ruby was built with --enable-dtrace and we can run
# dtrace(1) or stap(1):
cmd = "#{rubybin} --disable=gems -eexit"
case impl
when :dtrace; cmd = %W(dtrace -l -n ruby$target:::gc-sweep-end -c #{cmd})
when :stap; cmd = %W(stap -l process.mark("gc__sweep__end") -c #{cmd})
else
warn "don't know how to check if built with #{impl} support"
cmd = false
end
NEEDED_ENVS = [RbConfig::CONFIG["LIBPATHENV"], "RUBY", "RUBYOPT"].compact
if cmd and ok
sudocmd = []
if sudo
sudocmd << sudo
NEEDED_ENVS.each {|name| val = ENV[name] and sudocmd << "#{name}=#{val}"}
end
ok = system(*sudocmd, *cmd, err: IO::NULL, out: IO::NULL)
end
module DTrace
class TestCase < Test::Unit::TestCase
INCLUDE = File.expand_path('..', File.dirname(__FILE__))
case RUBY_PLATFORM
when /solaris/i
# increase bufsize to 8m (default 4m on Solaris)
DTRACE_CMD = %w[dtrace -b 8m]
when /darwin/i
READ_PROBES = proc do |cmd|
lines = nil
PTY.spawn(*cmd) do |io, _, pid|
lines = io.readlines.each {|line| line.sub!(/\r$/, "")}
Process.wait(pid)
end
lines
end if defined?(PTY)
end
# only handles simple cases, use a Hash for d_program
# if there are more complex cases
def dtrace2systemtap(d_program)
translate = lambda do |str|
# dtrace starts args with '0', systemtap with '1' and prefixes '$'
str = str.gsub(/\barg(\d+)/) { "$arg#{$1.to_i + 1}" }
# simple function mappings:
str.gsub!(/\bcopyinstr\b/, 'user_string')
str.gsub!(/\bstrstr\b/, 'isinstr')
str
end
out = ''
cond = nil
d_program.split(/^/).each do |l|
case l
when /\bruby\$target:::([a-z-]+)/
name = $1.gsub(/-/, '__')
out << %Q{probe process.mark("#{name}")\n}
when %r{/(.+)/}
cond = translate.call($1)
when "{\n"
out << l
out << "if (#{cond}) {\n" if cond
when "}\n"
out << "}\n" if cond
out << l
else
out << translate.call(l)
end
end
out
end
DTRACE_CMD ||= %w[dtrace]
READ_PROBES ||= proc do |cmd|
IO.popen(cmd, err: [:child, :out], &:readlines)
end
def trap_probe d_program, ruby_program
if Hash === d_program
d_program = d_program[IMPL] or
omit "#{d_program} not implemented for #{IMPL}"
elsif String === d_program && IMPL == :stap
d_program = dtrace2systemtap(d_program)
end
d = Tempfile.new(%w'probe .d')
d.write d_program
d.flush
rb = Tempfile.new(%w'probed .rb')
rb.write ruby_program
rb.flush
d_path = d.path
rb_path = rb.path
cmd = "#{RUBYBIN} --disable=gems -I#{INCLUDE} #{rb_path}"
if IMPL == :stap
cmd = %W(stap #{d_path} -c #{cmd})
else
cmd = [*DTRACE_CMD, "-q", "-s", d_path, "-c", cmd ]
end
if sudo = @@sudo
NEEDED_ENVS.each do |name|
if val = ENV[name]
cmd.unshift("#{name}=#{val}")
end
end
cmd.unshift(sudo)
end
probes = READ_PROBES.(cmd)
d.close(true)
rb.close(true)
yield(d_path, rb_path, probes)
end
end
end if ok
if ok
DTrace::TestCase.class_variable_set(:@@sudo, sudo)
DTrace::TestCase.const_set(:IMPL, impl)
DTrace::TestCase.const_set(:RUBYBIN, rubybin)
end
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