Hi,
I have a target to detect whether a port is listening, like the
following:
================================================================
<project name="test" default="test.server">
<target name="test.server" description="Test server.">
<echo message="trying to test server at localhost:39001..." />
<waitfor maxwait="300" maxwaitunit="second" checkevery="5"
timeoutproperty="server.not.started">
<and>
<socket server="localhost" port="39001" />
</and>
</waitfor>
<fail message="server did not start!" if="server.not.started" />
<echo message="server has started successfully." />
</target>
</project>
=================================================================
Put the codes into a build file and run it, I got the following result:
ant -f t.xml;netstat -an|grep 39001
Buildfile: t.xml
test.server:
[echo] trying to test server at localhost:39001...
[echo] server has started successfully.
BUILD SUCCESSFUL
Total time: 59 seconds
tcp 0 0 ::ffff:127.0.0.1:39001 ::ffff:127.0.0.1:39001
TIME_WAIT
Thoug there is no any server on 39001 started, after a while the target
will return with "server has started successfully". It is very strange.
Seems the <socket> task makes a listener on 39001 and detect it. So far
I just found the problem on RedHat Linux. And the time that <socket>
returns are different every time you run the target. Sometimes the
target works as expected and sometimes works as above.
Does anybody know what's the cause? Thanks
Best regards
Weifeng Niu
Tel: +86 10 8528 1188 ext. 1724
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