https://issues.apache.org/bugzilla/show_bug.cgi?id=48454
Summary: "Bad file descriptor"-IOException in CGIServlet for
some programs
Product: Tomcat 6
Version: 6.0.20
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: dev@tomcat.apache.org
ReportedBy: mgrie...@gmx.ch
Created an attachment (id=24763)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=24763)
Patch
The internal CGIRunner-thread which reads the errorstream logs a "Bad file
descriptor"-IOException everytime i called a program (see stacktrace at the
end). The program works fine, but the log-messages disturb.
I could reproduce the behaviour with Nagiostat as CGI-Program
(http://nagiostat.sourceforge.net/). I think the behaviour depends on how fast
the cgi-program will return, because I haven't the error with another
cgi-program on the same machine.
Looking at the code shows that the Process-Object in CGIRunner could be
destroyed before the internal Thread has a chance to completely read the
errorstream.
I fixed the problem in CGIServlet with a errorStreamReaderThread.join(...)
before proc.destroy() to allow a clean processing of the errorstream.
This is not yet fixed in tomcat trunk / branch tc6.0.x
Environment:
Linux, Centos5.3 x64, JDK SUN 1.6.0_17, JBoss AS 5.1.0.GA (based on tomcat6.0)
Patch: The attached Patch is against source of JBossWeb2.1.3. Improvement: The
timeout of the join should be configurable.
java.io.IOException: Bad file descriptor
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:199)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
at
org.apache.catalina.servlets.CGIServlet$CGIRunner.sendToLog(CGIServlet.java:1828)
at
org.apache.catalina.servlets.CGIServlet$CGIRunner.access$400(CGIServlet.java:1388)
at
org.apache.catalina.servlets.CGIServlet$CGIRunner$1.run(CGIServlet.java:1663)
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