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Subject: CGIRunner (at CGIServlet) problem
Date: Wed, 13 Oct 2004 18:36:57 +0200
Message-ID: <550DB94D61B5BA43AF7A61339ECA6B4CC69A6B@postman.iskon.local>
Thread-Topic: CGIRunner (at CGIServlet) problem
Thread-Index: AcSxQtrCk2LyT9GGTraEt8hwsJ6XIA==
From: =?iso-8859-2?Q?Kre=B9imir_Pavi=E6?= <Kresimir.Pavic@iskon.hr>
To: "Tomcat Developers List" <tomcat-dev@jakarta.apache.org>

Hi!

  I've found a problem in CGI module (servlets-cgi.jar) in Tomcat =
distribution.
  The problem occures in some occasions that are hard to reproduce.=20
  We have Tomcat that invokes some CGI (webmail) on Linux (Debian).
  Everthings worked fine, but
  after few days we discoverd lots of cgi programms that are hanged in =
WRITE mode.
  So after a week, we needed fast restart of Tomcat (OutOfMemoryError -> =
hanging=20
  forked proceses).

  Problem was detected in next few line (thread that reads from forked =
process and
  wirites data to client). In few occasions we catched this exception:
   java.net.SocketExcpetion: ClientAbortException (in code below)
  and our forked process didn't finish
  his work and remained hanging (in write mode ), but sometimes we got =
this exception:
   java.net.SocketException: Broken pipe (in catalina.out) and forked =
process finished=20
  his work as supposed.
  Both exceptions are thrown wheb client closes his/her browser before =
anthing appears.
  First excpetion is very hard to reproduce (try it :-).

  The solution is to add try-catch block in while loop. With this =
modification, any
  forked process will finish his work and be able to write the complete =
content=20
  (somewhere).

  while ((bufRead =3D commandsStdOut.read(cBuf)) !=3D -1) {
   if (servletContainerStdout !=3D null) {
      if (debug >=3D 4) {
         log("runCGI: write(\"" + new String(cBuf, 0, bufRead) + "\")");
      }

      /////////////////////////////
      // new code

      try {
        servletContainerStdout.write(cBuf, 0, bufRead); // old line
      } catch (java.net.SocketException se {
      servletContainerStdout =3D null;

      // end of new code
      ////////////////////////

   }
  }

              kresimir

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