[commit-cp] [bugs #10969] Classpath (+VM) terminates with "broken pipe"

[anonymous]

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 of the project: classpath.




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[bugs #10969] Full Item Snapshot:

URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=10969>
Project: classpath
Submitted by: 0
On: Thu 11/11/2004 at 17:16

Category:  classpath
Severity:  5 - Average
Resolution:  None
Privacy:  Public
Assigned to:  None
Status:  Open
Platform Version:  None


Summary:  Classpath (+VM) terminates with "broken pipe"

Original Submission:  System: Linux 2.6.8.1, Big Endian XScale
Java Env: JamVM 1.2.0 + Classpath 0.11

We're working on some networking applications on the XScale. From time to time 
we have the problem that JamVM hangs (terminates) with a "broken pipe" error 
message. This happens occasionally when a client disconnects from the server 
(implemented in java, running on the XScale). At first we tought that there 
might be something wrong with
our java code. But some more testing (along with a code review) with Sun's JRE 
showed that our code seems to be stable (no broken pipes or whatever with JRE).

So I started diging a little into Classpath and managed to nail down the 
location where the "broken pipe" error occurs. It is the _javanet_sendto 
function in native/jni/java-net/javanet.c . There the
TARGET_NATIVE_NETWORK_SOCKET_SEND (or better: the send function) results in a 
"broken pipe". I'm now thinking that there is something going wrong with 
network data being sent after the socket was taken down or something like that.

What I did as a workaround was adding a signal handler for SIGPIPE. There I 
throw an IO exception to inform the java code that something went wrong (see 
attached patch).
I'm very well aware that this is just a workaround but no real solution. 
In my opinion it is not ok that Classpath fails the way it does. Even if 
someone attempts to send data over a closed socket (what we think we are not 
doing - at least not a the java level and the Sun JRE doesn't say anything like 
that either) Classpath shouldn't and take down the whole VM with it. What I 
would have expected is throwing some kind of
exception to let the java programmer know that there is something going wrong. 

Tom Winkler
address@hidden





File Attachments
-------------------

-------------------------------------------------------
Date: Thu 11/11/2004 at 17:16  Name: classpath_sigpipe_handler.patch  Size: 
1.34KB   By: None
The attached patch catches the SIGPIPE signal and throws an IO_EXCEPTION 
instead of hanging the VM.
http://savannah.gnu.org/bugs/download.php?item_id=10969&amp;item_file_id=1865






For detailed info, follow this link:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=10969>

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