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require File.expand_path('../../../spec_helper', __FILE__)
describe "Process.wait" do
before :all do
begin
Process.waitall
rescue NotImplementedError
end
end
it "raises a Errno::ECHILD if there are no child processes" do
lambda { Process.wait }.should raise_error(Errno::ECHILD)
end
platform_is_not :windows do
it "returns its childs pid" do
pid = Process.fork { Process.exit! }
Process.wait.should == pid
end
it "sets $? to a Process::Status" do
pid = Process.fork { Process.exit! }
Process.wait
$?.should be_kind_of(Process::Status)
$?.pid.should == pid
end
it "waits for any child process if no pid is given" do
pid = Process.fork { Process.exit! }
Process.wait.should == pid
lambda { Process.kill(0, pid) }.should raise_error(Errno::ESRCH)
end
it "waits for a specific child if a pid is given" do
pid1 = Process.fork { Process.exit! }
pid2 = Process.fork { Process.exit! }
Process.wait(pid2).should == pid2
Process.wait(pid1).should == pid1
lambda { Process.kill(0, pid1) }.should raise_error(Errno::ESRCH)
lambda { Process.kill(0, pid2) }.should raise_error(Errno::ESRCH)
end
it "coerces the pid to an Integer" do
pid1 = Process.fork { Process.exit! }
Process.wait(mock_int(pid1)).should == pid1
lambda { Process.kill(0, pid1) }.should raise_error(Errno::ESRCH)
end
# This spec is probably system-dependent.
it "waits for a child whose process group ID is that of the calling process" do
read, write = IO.pipe
pid1 = Process.fork {
read.close
Process.setpgid(0, 0)
write << 1
write.close
Process.exit!
}
Process.setpgid(0, 0)
ppid = Process.pid
pid2 = Process.fork {
read.close
Process.setpgid(0, ppid);
write << 2
write.close
Process.exit!
}
write.close
read.read(1)
read.read(1) # to give children a chance to set their process groups
read.close
Process.wait(0).should == pid2
Process.wait.should == pid1
end
# This spec is probably system-dependent.
it "doesn't block if no child is available when WNOHANG is used" do
pid = Process.fork do
Signal.trap("TERM") { Process.exit! }
10.times { sleep(1) }
Process.exit!
end
Process.wait(pid, Process::WNOHANG).should be_nil
# sleep slightly to allow the child to at least start up and
# setup it's TERM handler
sleep 0.25
Process.kill("TERM", pid)
Process.wait.should == pid
end
it "always accepts flags=0" do
pid = Process.fork { Process.exit! }
Process.wait(-1, 0).should == pid
lambda { Process.kill(0, pid) }.should raise_error(Errno::ESRCH)
end
end
end
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