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Willy Tarreau 36d92dcd9b BUG/MEDIUM: evports: do not clear returned events list on signal 
Since 2.0 with commit 0ba4f483d2 ("MAJOR: polling: add event ports
support (Solaris)"), the polling system on Solaris suffers from a
signal handling problem. It turns out that this API is very bizarre,
as reported events are automatically unregistered and their counter
is updated in the same variable that was used to pass the count on
input, making it difficult to handle certain error codes (how should
one handle ENOSYS for example?). And to complete everything, the API
is able to return both EINTR and an event if a signal is reported.

The code tries to deal with certain such cases (e.g. ETIME for timeout
can also report an event), otherwise it defaults to clearing the
event counter upon error. This has the effect that EINTR clears the
list of events, which are also automatically cleared from the set by
the system.

This is visible when using external checks where the SIGCHLD of the
leaving child causes a wakeup that ruins the event counter and causes
endless loops, apparently due to the queued inter-thread byte in the
pipe used to wake threads up that never gets removed in this case.
Note that extcheck would also deserve deeper investigation because it
can immediately re-trigger a check in such a case, which is not normal.

Removing the wiping of the nevlist variable fixes the problem.

This can be backported to all versions since it affects 2.0.
2024-04-17 16:25:20 +02:00
.github CI: reduce ASAN log redirection umbrella size 2024-04-17 11:14:44 +02:00
addons CLEANUP: assorted typo fixes in the code and comments 2024-03-05 11:50:34 +01:00
admin BUILD: address a few remaining calloc(size, n) cases 2024-02-10 11:37:27 +01:00
dev MEDIUM: ring: use the topmost bit of the tail as a lock 2024-03-25 17:34:19 +00:00
doc CLEANUP: assorted typo fixes in the code and comments 2024-04-17 11:14:44 +02:00
examples CLEANUP: assorted typo fixes in the code and comments 2023-11-23 16:23:14 +01:00
include CLEANUP: assorted typo fixes in the code and comments 2024-04-17 11:14:44 +02:00
reg-tests CLEANUP: assorted typo fixes in the code and comments 2024-04-17 11:14:44 +02:00
scripts CI: ssl: add yet another OpenSSL download fallback 2024-02-07 11:05:45 +01:00
src BUG/MEDIUM: evports: do not clear returned events list on signal 2024-04-17 16:25:20 +02:00
tests Revert "MAJOR: import: update mt_list to support exponential back-off" 2023-09-15 17:13:43 +02:00
.cirrus.yml CI: cirrus-ci: display gdb bt if any 2023-09-22 08:28:30 +02:00
.gitattributes
.gitignore CONTRIB: Add vi file extensions to .gitignore 2023-06-02 18:14:34 +02:00
.mailmap
.travis.yml
BRANCHES
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.0-dev7 2024-04-06 17:02:07 +02:00
CONTRIBUTING
INSTALL DOC: install: clarify the build process by splitting it into subsections 2024-04-11 18:02:26 +02:00
LICENSE
MAINTAINERS MAJOR: spoe: Deprecate the SPOE filter 2024-03-15 11:29:39 +01:00
Makefile CLEANUP: makefile: make the output of the "opts" target more readable 2024-04-11 17:33:28 +02:00
README
SUBVERS
VERDATE [RELEASE] Released version 3.0-dev7 2024-04-06 17:02:07 +02:00
VERSION [RELEASE] Released version 3.0-dev7 2024-04-06 17:02:07 +02:00

README 

The HAProxy documentation has been split into a number of different files for
ease of use.

Please refer to the following files depending on what you're looking for :

  - INSTALL for instructions on how to build and install HAProxy
  - BRANCHES to understand the project's life cycle and what version to use
  - LICENSE for the project's license
  - CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory :

  - doc/intro.txt for a quick introduction on HAProxy
  - doc/configuration.txt for the configuration's reference manual
  - doc/lua.txt for the Lua's reference manual
  - doc/SPOE.txt for how to use the SPOE engine
  - doc/network-namespaces.txt for how to use network namespaces under Linux
  - doc/management.txt for the management guide
  - doc/regression-testing.txt for how to use the regression testing suite
  - doc/peers.txt for the peers protocol reference
  - doc/coding-style.txt for how to adopt HAProxy's coding style
  - doc/internals for developer-specific documentation (not all up to date)