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Werk #3286: Fixing possible logging issues when using datasource programs for monitoring

Component Core & setup
Title Fixing possible logging issues when using datasource programs for monitoring
Date Mar 11, 2016
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
1.2.8b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

When calling datasource programs for monitoring they are executed as subprocesses of Check_MK. Check_MK as passing all filedescriptors except stdout and stderr to the subprocess. So if a subprocess was doing something strange with them it could happen that this influenced the handling within Check_MK.

This could, for example, confuse the communication between the CMC and the Check_MK keepalive helper processes.

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