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require_relative '../../spec_helper'
describe "Process.detach" do
platform_is_not :windows do
it "returns a thread" do
pid = Process.fork { Process.exit! }
thr = Process.detach(pid)
thr.should be_kind_of(Thread)
thr.join
end
it "produces the exit Process::Status as the thread value" do
pid = Process.fork { Process.exit! }
thr = Process.detach(pid)
thr.join
status = thr.value
status.should be_kind_of(Process::Status)
status.pid.should == pid
end
platform_is_not :openbsd do
it "reaps the child process's status automatically" do
pid = Process.fork { Process.exit! }
Process.detach(pid).join
-> { Process.waitpid(pid) }.should raise_error(Errno::ECHILD)
end
end
it "sets the :pid thread-local to the PID" do
pid = Process.fork { Process.exit! }
thr = Process.detach(pid)
thr.join
thr[:pid].should == pid
end
it "provides a #pid method on the returned thread which returns the PID" do
pid = Process.fork { Process.exit! }
thr = Process.detach(pid)
thr.join
thr.pid.should == pid
end
it "tolerates not existing child process pid" do
# Use a value that is close to the INT_MAX (pid usually is signed int).
# It should (at least) be greater than allowed pid limit value that depends on OS.
pid_not_existing = 2.pow(30)
# Check that there is no a child process with this hardcoded pid.
# Command `kill 0 pid`:
# - returns "1" if a process exists and
# - raises Errno::ESRCH otherwise
-> { Process.kill(0, pid_not_existing) }.should raise_error(Errno::ESRCH)
thr = Process.detach(pid_not_existing)
thr.join
thr.should be_kind_of(Thread)
end
it "calls #to_int to implicitly convert non-Integer pid to Integer" do
pid = MockObject.new('mock-enumerable')
pid.should_receive(:to_int).and_return(100500)
Process.detach(pid).join
end
it "raises TypeError when pid argument does not have #to_int method" do
-> { Process.detach(Object.new) }.should raise_error(TypeError, "no implicit conversion of Object into Integer")
end
it "raises TypeError when #to_int returns non-Integer value" do
pid = MockObject.new('mock-enumerable')
pid.should_receive(:to_int).and_return(:symbol)
-> { Process.detach(pid) }.should raise_error(TypeError, "can't convert MockObject to Integer (MockObject#to_int gives Symbol)")
end
end
end
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