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From "Ana Solano Ros (JIRA)" <j...@apache.org>
Subject [jira] Created: (DAEMON-186) jsvc consumes 100% CPU when redirecting errfile (and not outfile) to syslog
Date Thu, 04 Nov 2010 14:15:41 GMT
jsvc consumes 100% CPU when redirecting errfile (and not outfile) to syslog
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                 Key: DAEMON-186
                 URL: https://issues.apache.org/jira/browse/DAEMON-186
             Project: Commons Daemon
          Issue Type: Bug
          Components: Jsvc
    Affects Versions: 1.0.1
         Environment: Ubuntu
            Reporter: Ana Solano Ros
            Priority: Minor


When you run jsvc redirecting -errfile to syslog but not -outfile to syslog the jsvc process
in charge of the redirection to syslog daemon consumes 100% CPU.
The problem dissapears when redirecting both (-errfile and -outfile) to syslog.
The problem appears when only one is redirected to syslog and the other parameter is not specified
or redirected to a file.

The problem in the process appears to be the following:
- jsvc  tries to open 2 file descriptors, one for the standard output and one for the error
output, and listen to both file descriptors
- when it receives a message from one of both descriptors it sends the message to syslog daemon.
- In the case that only -errfile is specified (and not -outfile), when jsvc tries to open
the stardard output file descriptor it fails and the file descriptor points to "0" (default
value, /dev/null).
- The jsvc listen to both descriptors, the error output (that was correctly opened) and the
0 file descriptor, and jsvc is receiving data continously from this "broken" file descriptor.
So it enters in a loop that consumes 100% of CPU.


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