criu: move sigact dump/restore code into sigact.c

[arnavbhatt288]

Move sigact dump/restore code into sigact.c

Resolves: #336

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.31250% with 70 lines in your changes are missing coverage. Please review.

Project coverage is 70.76%. Comparing base (cb39c62) to head (ff41d2e). Report is 4 commits behind head on criu-dev.

:exclamation: Current head ff41d2e differs from pull request most recent head 5176b7d. Consider uploading reports for the commit 5176b7d to get more accurate results

Files	Patch %	Lines
criu/sigact.c	45.31%	70 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## criu-dev #2361 +/- ## ============================================ + Coverage 70.21% 70.76% +0.54% ============================================ Files 132 136 +4 Lines 34372 32963 -1409 ============================================ - Hits 24134 23325 -809 + Misses 10238 9638 -600 ```

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[avagin]

criu: move sigact dump/restore code into sigact.c Move sigact dump/restore code into sigact.c

• Need to separate subject from body with a blank line.
• The body should not repeat the subject.

[Snorch]

Please delete #include "images/sa.pb-c.h" from criu/parasite-syscall.c as it becomes unused AFAICS after this PR.

[Snorch]

Test errors: 1) Fedora ASAN Test / build Error is

2024-04-21T22:05:17.5751499Z ------------------------ grep Error ------------------------
2024-04-21T22:05:17.5752133Z b'(00.134397) cg: Restoring cgroup property value [0] to [zdtmtst/bar/notify_on_release]'
2024-04-21T22:05:17.5752883Z b'(00.134415) cg: Restoring cgroup property value [] to [zdtmtst/bar/cgroup.procs]'
2024-04-21T22:05:17.5753563Z b'(00.134438) cg: Restoring cgroup property value [] to [zdtmtst/bar/tasks]'
2024-04-21T22:05:17.5754964Z b'(00.134454) cg: Restoring cgroup property value [0] to [zdtmtst/foo/cgroup.clone_children]'
2024-04-21T22:05:17.5756990Z b'(00.134469) Error (criu/cgroup.c:1434): cg: bad cgroup path: zdtmtst/foo/cgroup.clone_children: No such file or directory'
2024-04-21T22:05:17.5758464Z b'(00.135163) mnt: Switching to new ns to clean ghosts'
2024-04-21T22:05:17.5759064Z b'(00.135316) Error (criu/cr-restore.c:2310): Restoring FAILED.'
2024-04-21T22:05:17.5759578Z ------------------------ ERROR OVER ------------------------
2024-04-21T22:05:17.5760092Z ############## Test zdtm/static/cgroupv2_00 FAIL at CRIU restore ###############

It seems that there is no more of this cgroup.clone_children file in cgroup-v2:

[linux]$ git grep clone_children | grep cgroup-v2
Documentation/admin-guide/cgroup-v2.rst:- "cgroup.clone_children" is removed.

This is not related to this PR. 2) CRIU Image Streamer Test / build (pull_request)

2024-04-21T22:05:07.9500880Z ========================= Test zdtm/static/fpu03 PASS ==========================
2024-04-21T22:05:07.9501386Z ========================== Run zdtm/static/fpu03 in h ==========================
2024-04-21T22:05:07.9501931Z Start test
2024-04-21T22:05:07.9502255Z ./fpu03 --pidfile=fpu03.pid --outfile=fpu03.out
2024-04-21T22:05:07.9502667Z Run criu-image-streamer in capture mode
2024-04-21T22:05:07.9502980Z Run criu dump
2024-04-21T22:05:07.9503264Z Run criu-image-streamer in extract mode
2024-04-21T22:05:07.9503644Z Run criu-image-streamer in serve mode
2024-04-21T22:05:07.9503952Z Run criu restore
2024-04-21T22:05:07.9504208Z Traceback (most recent call last):
2024-04-21T22:05:07.9504686Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 2847, in <module>
2024-04-21T22:05:07.9505157Z     fork_zdtm()
2024-04-21T22:05:07.9505554Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 2838, in fork_zdtm
2024-04-21T22:05:07.9506083Z     do_run_test(tinfo[0], tinfo[1], tinfo[2], tinfo[3])
2024-04-21T22:05:07.9506614Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 1932, in do_run_test
2024-04-21T22:05:07.9507101Z     cr(cr_api, t, opts)
2024-04-21T22:05:07.9507489Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 1609, in cr
2024-04-21T22:05:07.9507988Z     os.environ["ZDTM_TEST_PID"] = str(test.getpid())
2024-04-21T22:05:07.9508498Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 561, in getpid
2024-04-21T22:05:07.9509167Z     self.__pid = rpidfile(self.__pidfile())
2024-04-21T22:05:07.9509654Z   File "/home/runner/work/criu/criu/test/zdtm.py", line 339, in rpidfile
2024-04-21T22:05:07.9510114Z     with open(path) as fd:
2024-04-21T22:05:07.9510648Z FileNotFoundError: [Errno 2] No such file or directory: 'zdtm/static/fpu03.pid'

This one I'm not sure. 3) Compat Tests / build (GCC) (pull_request) is same as in here https://github.com/checkpoint-restore/criu/pull/2380#pullrequestreview-2065281120 - unrelated.

[avagin]

LGTM