Werk #3234: Make unixcat more robust

Component Core & setup
Title Make unixcat more robust
Date Feb 23, 2016
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.2.8b3 1.4.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Previously it could happen that unixcat crashed when system resources and/or limits were low, especially the nproc limit. Now we emit sensible error messages and exit with new return codes (5 and 6).

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