[checkmk-commits] [Checkmk/checkmk] a1bbb9: Read stderr in fetcher helper

Branch: refs/heads/2.1.0 Home: https://github.com/Checkmk/checkmk Commit: a1bbb98c35b7a322dbf9a642fb288d9cb0d9057a https://github.com/Checkmk/checkmk/commit/a1bbb98c35b7a322dbf9a642fb288d9cb… Author: Mathias Laurin <mathias.laurin(a)checkmk.com> Date: 2023-07-10 (Mon, 10 Jul 2023) Changed paths: A .werks/15162 Log Message: ----------- Read stderr in fetcher helper We have to read from stderr because the FD is polled. The fetchers do not use stderr explicitly but some of the 3rd party libraryies we're using (IPMI, SNMP) might write there. Polling without reading the FD leads to a tight loop in the poller: 1. stderr has data 2. poll stderr -> wants read 3. noop handle stderr -> data still available on stderr 4. go to 1 (tight loop in system calls) Werk-15162 SUP-10577 SUP-12568 Change-Id: Ifadc84f04d361e3080c439e29588e01f5df04d10