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From "Ana Solano Ros (JIRA)" <>
Subject [jira] Updated: (DAEMON-186) jsvc consumes 100% CPU when redirecting errfile (and not outfile) to syslog
Date Mon, 08 Nov 2010 09:51:10 GMT


Ana Solano Ros updated DAEMON-186:

    Affects Version/s: 1.0.2

> jsvc consumes 100% CPU when redirecting errfile (and not outfile) to syslog
> ---------------------------------------------------------------------------
>                 Key: DAEMON-186
>                 URL:
>             Project: Commons Daemon
>          Issue Type: Bug
>          Components: Jsvc
>    Affects Versions: 1.0.1, 1.0.2, 1.0.4
>         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
> - 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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