Revise `upsd` behavior of `MAXCONN` vs. `ulimit -n` (`getrlimit()`)#3433

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jimklimov wants to merge 7 commits into

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jimklimov:issue-3365

Commits on May 11, 2026

server/upsd.h: update (C) heading and whitespace styling
jimklimov
committed
server/conf.c, server/upsd.{c,h}, NEWS.adoc: if we hit "Too many open files" during configuration reload, close oldest client connection and retry [#3365]
jimklimov
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server/upsd.{c,h}, NEWS.adoc, UPGRADING.adoc: consider getrlimit() permissons vs. MAXCONN request [#3365]
jimklimov
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server/upsd.c: be sure to re-detect sysmaxconn after (re-)loading config [#3365]
jimklimov
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server/upsd.c: update_sysmaxconn(): revise warning message about hard limit [#3365]
jimklimov
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server/upsd.c: update_sysmaxconn(): check that detected sysmaxconn_hard is big enough to be useful considering the RESERVE_FD_COUNT_UPSD set aside AND a few actual connections [#3365]
jimklimov
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server/upsd.c: update_sysmaxconn(): default the sysmaxconn value to "MAX - RESERVE_FD_COUNT_UPSD" on platforms where it might matter [#3365]
jimklimov
committed