8293466: libjsig should ignore non-modifying sigaction calls

[tstuefe]

Small fix that fixes corner cases with signal chaining in libjsig.

---

Progress

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Issue

• JDK-8293466: libjsig should ignore non-modifying sigaction calls

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev pull/1049/head:pull/1049
$ git checkout pull/1049

Update a local copy of the PR:
$ git checkout pull/1049
$ git pull https://git.openjdk.org/jdk17u-dev pull/1049/head

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$ git pr checkout 1049

View PR using the GUI difftool:
$ git pr show -t 1049

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Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1049.diff

[bridgekeeper]

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@tstuefe This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8293466: libjsig should ignore non-modifying sigaction calls

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[mlbridge]

Webrevs

• 02: Full - Incremental (7a74bfc6)
• 01: Full - Incremental (608f1ff3)
• 00: Full (4a5fc68e)

[tstuefe]

/integrate

[openjdk]

Going to push as commit b7d83f4.
Since your change was applied there have been 19 commits pushed to the master branch:

• fae1628: 8293493: Signal Handlers printout should show signal block state
• d1ad596: 8293691: converting a defined BasicType value to a string should not crash the VM
• 229288b: 8277946: NMT: Remove VM.native_memory shutdown jcmd command option
• d3c93e7: 8280048: Missing comma in copyright header
• 1cee8aa: 8231491: JDI tc02x004 failed again due to wrong # of breakpoints
• fde708b: 8282771: Create test case for JDK-8262981
• 2f9983c: 8285690: CloneableReference subtest should not throw CloneNotSupportedException
• 8c2a6bd: 8144030: [macosx] test java/awt/Frame/ShapeNotSetSometimes/ShapeNotSetSometimes.java fails (again)
• 3993301: 8287491: compiler/jvmci/errors/TestInvalidDebugInfo.java fails new assert: assert((uint)t < T_CONFLICT + 1) failed: invalid type #
• b3a8ad5: 6528710: sRGB-ColorSpace to sRGB-ColorSpace Conversion
• ... and 9 more: https://git.openjdk.org/jdk17u-dev/compare/0056a6330bb2e806ea47da0c51af0ab095feb25d...master

Your commit was automatically rebased without conflicts.

[openjdk]

@tstuefe Pushed as commit b7d83f4.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.