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require File.expand_path('../../../spec_helper', __FILE__)
describe "Signal.trap" do
before :each do
ScratchPad.clear
@proc = lambda { ScratchPad.record :proc_trap }
@saved_trap = Signal.trap(:HUP, @proc)
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 in place of a proc/command argument" do
Signal.trap(:HUP) { ScratchPad.record :block_trap }
Process.kill :HUP, Process.pid
sleep 0.5
ScratchPad.recorded.should == :block_trap
end
ruby_version_is ""..."1.9" do
it "ignores the signal when passed nil" do
Signal.trap :HUP, nil
Signal.trap(:HUP, @saved_trap).should == "IGNORE"
end
it "uses the command argument when passed both a command and block" do
Signal.trap(:HUP, @proc) { ScratchPad.record :block_trap }
Process.kill :HUP, Process.pid
sleep 0.5
ScratchPad.recorded.should == :proc_trap
end
end
ruby_version_is "1.9" do
it "ignores the signal when passed nil" do
Signal.trap :HUP, nil
Signal.trap(:HUP, @saved_trap).should be_nil
end
end
it "accepts long names as Strings" do
Signal.trap "SIGHUP", @proc
Signal.trap("SIGHUP", @saved_trap).should equal(@proc)
end
it "acceps 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 "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, "SIG_IGN").should == "IGNORE"
end
it "accepts 'IGNORE' in place of a proc" do
Signal.trap :HUP, "IGNORE"
Signal.trap(:HUP, "IGNORE").should == "IGNORE"
end
describe "the special EXIT signal code" do
it "accepts the EXIT code" do
code = "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}; trap(:EXIT, proc {print 2}); at_exit {print 3}"
ruby_exe(code).should == "231"
end
it "can unset the handler" do
code = "trap(:EXIT, proc { print 1 }); trap(:EXIT, 'DEFAULT')"
ruby_exe(code).should == ""
end
end
end
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