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require_relative '../../spec_helper'
describe "Signal.trap" do
platform_is_not :windows do
before :each do
ScratchPad.clear
@proc = -> {}
@saved_trap = Signal.trap(:HUP, @proc)
@hup_number = Signal.list["HUP"]
end
after :each do
Signal.trap(:HUP, @saved_trap) if @saved_trap
end
it "returns the previous handler" do
Signal.trap(:HUP, @saved_trap).should equal(@proc)
end
it "accepts a block" do
done = false
Signal.trap(:HUP) do |signo|
signo.should == @hup_number
ScratchPad.record :block_trap
done = true
end
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should == :block_trap
end
it "accepts a proc" do
done = false
handler = -> signo {
signo.should == @hup_number
ScratchPad.record :proc_trap
done = true
}
Signal.trap(:HUP, handler)
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should == :proc_trap
end
it "accepts a method" do
done = false
handler_class = Class.new
hup_number = @hup_number
handler_class.define_method :handler_method do |signo|
signo.should == hup_number
ScratchPad.record :method_trap
done = true
end
handler_method = handler_class.new.method(:handler_method)
Signal.trap(:HUP, handler_method)
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should == :method_trap
end
it "accepts anything you can call" do
done = false
callable = Object.new
hup_number = @hup_number
callable.singleton_class.define_method :call do |signo|
signo.should == hup_number
ScratchPad.record :callable_trap
done = true
end
Signal.trap(:HUP, callable)
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should == :callable_trap
end
it "raises an exception for a non-callable at the point of use" do
not_callable = Object.new
Signal.trap(:HUP, not_callable)
-> {
Process.kill :HUP, Process.pid
loop { Thread.pass }
}.should raise_error(NoMethodError)
end
it "accepts a non-callable that becomes callable when used" do
done = false
late_callable = Object.new
hup_number = @hup_number
Signal.trap(:HUP, late_callable)
late_callable.singleton_class.define_method :call do |signo|
signo.should == hup_number
ScratchPad.record :late_callable_trap
done = true
end
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should == :late_callable_trap
end
it "is possible to create a new Thread when the handler runs" do
done = false
Signal.trap(:HUP) do
thr = Thread.new { }
thr.join
ScratchPad.record(thr.group == Thread.main.group)
done = true
end
Process.kill :HUP, Process.pid
Thread.pass until done
ScratchPad.recorded.should be_true
end
it "registers an handler doing nothing with :IGNORE" do
Signal.trap :HUP, :IGNORE
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "can register a new handler after :IGNORE" do
Signal.trap :HUP, :IGNORE
done = false
Signal.trap(:HUP) do
ScratchPad.record :block_trap
done = true
end
Process.kill(:HUP, Process.pid).should == 1
Thread.pass until done
ScratchPad.recorded.should == :block_trap
end
it "ignores the signal when passed nil" do
Signal.trap :HUP, nil
Signal.trap(:HUP, @saved_trap).should be_nil
end
it "accepts :DEFAULT in place of a proc" do
Signal.trap :HUP, :DEFAULT
Signal.trap(:HUP, @saved_trap).should == "DEFAULT"
end
it "accepts :SIG_DFL in place of a proc" do
Signal.trap :HUP, :SIG_DFL
Signal.trap(:HUP, @saved_trap).should == "DEFAULT"
end
it "accepts :SIG_IGN in place of a proc" do
Signal.trap :HUP, :SIG_IGN
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "accepts :IGNORE in place of a proc" do
Signal.trap :HUP, :IGNORE
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "accepts 'SIG_DFL' in place of a proc" do
Signal.trap :HUP, "SIG_DFL"
Signal.trap(:HUP, @saved_trap).should == "DEFAULT"
end
it "accepts 'DEFAULT' in place of a proc" do
Signal.trap :HUP, "DEFAULT"
Signal.trap(:HUP, @saved_trap).should == "DEFAULT"
end
it "accepts 'SIG_IGN' in place of a proc" do
Signal.trap :HUP, "SIG_IGN"
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "accepts 'IGNORE' in place of a proc" do
Signal.trap :HUP, "IGNORE"
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "accepts long names as Strings" do
Signal.trap "SIGHUP", @proc
Signal.trap("SIGHUP", @saved_trap).should equal(@proc)
end
it "accepts short names as Strings" do
Signal.trap "HUP", @proc
Signal.trap("HUP", @saved_trap).should equal(@proc)
end
it "accepts long names as Symbols" do
Signal.trap :SIGHUP, @proc
Signal.trap(:SIGHUP, @saved_trap).should equal(@proc)
end
it "accepts short names as Symbols" do
Signal.trap :HUP, @proc
Signal.trap(:HUP, @saved_trap).should equal(@proc)
end
it "calls #to_str on an object to convert to a String" do
obj = mock("signal")
obj.should_receive(:to_str).exactly(2).times.and_return("HUP")
Signal.trap obj, @proc
Signal.trap(obj, @saved_trap).should equal(@proc)
end
it "accepts Integer values" do
hup = Signal.list["HUP"]
Signal.trap hup, @proc
Signal.trap(hup, @saved_trap).should equal(@proc)
end
it "does not call #to_int on an object to convert to an Integer" do
obj = mock("signal")
obj.should_not_receive(:to_int)
-> { Signal.trap obj, @proc }.should raise_error(ArgumentError, /bad signal type/)
end
it "raises ArgumentError when passed unknown signal" do
-> { Signal.trap(300) { } }.should raise_error(ArgumentError, "invalid signal number (300)")
-> { Signal.trap("USR10") { } }.should raise_error(ArgumentError, /\Aunsupported signal [`']SIGUSR10'\z/)
-> { Signal.trap("SIGUSR10") { } }.should raise_error(ArgumentError, /\Aunsupported signal [`']SIGUSR10'\z/)
end
it "raises ArgumentError when passed signal is not Integer, String or Symbol" do
-> { Signal.trap(nil) { } }.should raise_error(ArgumentError, "bad signal type NilClass")
-> { Signal.trap(100.0) { } }.should raise_error(ArgumentError, "bad signal type Float")
-> { Signal.trap(Rational(100)) { } }.should raise_error(ArgumentError, "bad signal type Rational")
end
# See man 2 signal
%w[KILL STOP].each do |signal|
it "raises ArgumentError or Errno::EINVAL for SIG#{signal}" do
-> {
Signal.trap(signal, -> {})
}.should raise_error(StandardError) { |e|
[ArgumentError, Errno::EINVAL].should include(e.class)
e.message.should =~ /Invalid argument|Signal already used by VM or OS/
}
end
end
%w[SEGV BUS ILL FPE VTALRM].each do |signal|
it "raises ArgumentError for SIG#{signal} which is reserved by Ruby" do
-> {
Signal.trap(signal, -> {})
}.should raise_error(ArgumentError, "can't trap reserved signal: SIG#{signal}")
end
end
it "allows to register a handler for all known signals, except reserved signals for which it raises ArgumentError" do
out = ruby_exe(fixture(__FILE__, "trap_all.rb"), args: "2>&1")
out.should == "OK\n"
$?.exitstatus.should == 0
end
it "returns 'DEFAULT' for the initial SIGINT handler" do
ruby_exe("print Signal.trap(:INT) { abort }").should == 'DEFAULT'
end
it "returns SYSTEM_DEFAULT if passed DEFAULT and no handler was ever set" do
Signal.trap("PROF", "DEFAULT").should == "SYSTEM_DEFAULT"
end
it "accepts 'SYSTEM_DEFAULT' and uses the OS handler for SIGPIPE" do
code = <<-RUBY
p Signal.trap('PIPE', 'SYSTEM_DEFAULT')
r, w = IO.pipe
r.close
loop { w.write("a"*1024) }
RUBY
out = ruby_exe(code, exit_status: :SIGPIPE)
status = $?
out.should == "nil\n"
status.should.signaled?
end
end
describe "the special EXIT signal code" do
it "accepts the EXIT code" do
code = "Signal.trap(:EXIT, proc { print 1 })"
ruby_exe(code).should == "1"
end
it "runs the proc before at_exit handlers" do
code = "at_exit {print 1}; Signal.trap(:EXIT, proc {print 2}); at_exit {print 3}"
ruby_exe(code).should == "231"
end
it "can unset the handler" do
code = "Signal.trap(:EXIT, proc { print 1 }); Signal.trap(:EXIT, 'DEFAULT')"
ruby_exe(code).should == ""
end
end
end
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