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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