psafont / xen-api

78%

master: 78%

LAST BUILD ON BRANCH v25.14.0

branch: v25.14.0

CHANGE BRANCH

x

Reset

Sync Branches

• v25.14.0
• 52
• bump
• certdocs
• ci
• cifix
• codecov-fallback
• copam
• deb/pau/important-backtraces-8
• dev/pau-vdi-revert-alpha
• dev/pau/53
• dev/pau/541
• dev/pau/cmdliner
• dev/pau/cross-pool-fix
• dev/pau/errors-ha
• dev/pau/errors-ha-master
• dev/pau/format
• dev/pau/ha_errs
• dev/pau/haxn
• dev/pau/host-ipv6
• dev/pau/important-backtraces
• dev/pau/ipv6-autoconf
• dev/pau/ipv6-autoconf-backport
• dev/pau/listless
• dev/pau/majmin
• dev/pau/migracap
• dev/pau/no-exns
• dev/pau/nocov
• dev/pau/ocaml54
• dev/pau/oformat.28.1
• dev/pau/opam
• dev/pau/opam-metadata
• dev/pau/prepof28.1
• dev/pau/quality
• dev/pau/random-fixes
• dev/pau/release-8.3
• dev/pau/revlog
• dev/pau/revlog-9
• dev/pau/schemabump
• dev/pau/smplugins
• dev/pau/smplugins-9
• dev/pau/snaptags
• dev/pau/sr-suspend
• dev/pau/stringless
• dev/pau/strings
• dev/pau/system-status
• dev/pau/tweaks
• dev/pau/vdi-revert
• dev/pau/vdi-revert-alpha
• dev/pau/vdi-revert-doc
• dev/pau/version
• dev/pau/zerotest
• dev/paus/delays
• dev/paus/platformdata
• dev/psafont/arg
• dev/psafont/arm64
• dev/psafont/dcmi
• dev/psafont/format
• dev/psafont/makemake
• dev/psafont/onlink
• dev/psafont/python
• dev/psafont/ssh-design
• dune-mswitch
• dune-vhd-tool
• endcover
• feature/perf-edvint
• fix-pkgs
• fixes-next
• forkexec+
• forktests
• getallwhere
• ghperms
• gtn-check-all-changes-during-sr-scan
• hold
• info
• instafix
• last_async
• late-licenses
• logconn
• makemake
• master
• meta
• metacap
• no-async
• nosystemd
• nowarns
• nuuid
• omore
• packs
• parops
• pau/dev/cross-pool-fix
• pkg-fix
• private/mingl/CP-44103
• private/paus/accept-rrd
• private/paus/async-mig
• private/paus/async_mig
• private/paus/bashcheck
• private/paus/console_api
• private/paus/datasource-confusion
• private/paus/dev/setup
• private/paus/dns
• private/paus/dopon
• private/paus/duneless-release
• private/paus/fingers-crossed
• private/paus/forktime
• private/paus/gencertg
• private/paus/grandates
• private/paus/hold-name-label
• private/paus/ign
• private/paus/ipmissing
• private/paus/ipv6
• private/paus/ipv6-hack
• private/paus/its-about-mtime
• private/paus/late-socket
• private/paus/logs
• private/paus/logsig
• private/paus/minions
• private/paus/netconf
• private/paus/new-crypto
• private/paus/new-numa
• private/paus/nopes
• private/paus/numa
• private/paus/numa-claim
• private/paus/numa-default
• private/paus/numa-hard-feature
• private/paus/numa-mem-metrics
• private/paus/numa-share
• private/paus/numa-xs8
• private/paus/numaybe
• private/paus/numnummaybe
• private/paus/one-unlock
• private/paus/op-ehm
• private/paus/order_some_plugs
• private/paus/osandbox
• private/paus/paraxenopers
• private/paus/parops
• private/paus/parsed-pems
• private/paus/paused-metrics
• private/paus/pdates
• private/paus/perfuffle
• private/paus/pimpampem
• private/paus/pre-numa
• private/paus/pvhterm
• private/paus/random-fixes
• private/paus/scrub
• private/paus/sd_notify
• private/paus/smint
• private/paus/stdless
• private/paus/storage-errors
• private/paus/stringy-crypto
• private/paus/tears-in-the-rain
• private/paus/timesout
• private/paus/undate
• private/paus/unknown-error
• private/paus/upup
• private/paus/validation
• private/paus/vhd-cleanup
• private/paus/xenops-long-waits
• private/paus/xpool
• private/paus/xs-up
• qcheck-core
• qgate
• release-acquire
• rrd-unpack
• runs
• sad-dco
• scheduled-yangtze
• stressdune
• strip_xfm
• test-new-setup
• tests
• trunc_claims
• tryshut
• unit-test
• unzurich
• up
• utop
• v25.1.0
• v25.10.0
• v25.11.0
• v25.12.0
• v25.13.0
• v25.15.0
• v25.16.0
• v25.17.0
• v25.18.0
• v25.19.0
• v26.1.3-8.3
• xen_types

Build # 13928159292

Build Type

push

github

Committed by web-flow

Commit Message

IH-533: Remove usage of forkexecd daemon to execute processes (#5995)

Forkexecd was written to avoid some issues with Ocaml and
multi-threading.
Instead use C code to launch processes and avoid these issues.
Interface remains unchanged from Ocaml side but implementation rely
entirely on C code.
vfork() is used to avoid performance memory issue.
Reap of the processes are done directly.
Code automatically reap child processes to avoid zombies.
One small helper is used to better separate Ocaml and C code and
handling syslog redirection. This allows to better debug in case of
issues.
Syslog handling is done in a separate process allowing to restart the
toolstack and keep launched programs running; note that even with
forkexecd daemon one process was used for this purpose.
Code tries to keep compatibility with forkexecd, in particular:
- SIGPIPE is ignored in the parent;
- /dev/null is open with O_WRONLY even for stdin;
- file descriptors are limited to 1024.

We use close_range (if available) to reduce system calls to close file
descriptors.
Cgroup is set to avoid systemd closing processes on toolstack restart.
There's a fuzzer program to check file remapping algorithm; for this
reason the algorithm is in a separate file.

To turn internal debug on, you need to set FORKEXECD_DEBUG_LOGS C
preprocessor macro to 1.

Coverage Stats

3356 of 4319 relevant lines covered (77.7%)

0.78 hits per line