open pidfd in child process and send to the parent via SOCK_SEQPACKET+CMSG #113939
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ping @Mark-Simulacrum |
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| msg.msg_controllen = mem::size_of::<Cmsg>() as _; | ||
| msg.msg_control = &mut cmsg as *mut _ as *mut _; | ||
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| match cvt_r(|| libc::recvmsg(sock.as_raw(), &mut msg, 0)) { |
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Do we need a timeout here (or something like it) at all? E.g., if we're unlucky and the child process is kill'd by something before we get the pidfd sent back? Or will that close the stream and end here?
My sense is that we should be ok, but wanted to raise in case I overlooked something.
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The parent closes its output, so only the child holds the remote side of the socket open. If the child gets killed that gets closed, which disconnects the socket which in turn leads to a 0-length read in the parent and a return from this function.
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📌 Commit 4673247bf49c260e952082d463fb74342aa81434 has been approved by It is now in the queue for this repository. |
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⌛ Testing commit 4673247bf49c260e952082d463fb74342aa81434 with merge 829cf9a30cfb622ec07dbad9fddeffdae487b630... |
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💔 Test failed - checks-actions |
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…+CMSG This is a 100% race-free way to obtain a child's pidfd while avoiding `clone3`.
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fixed cfg on the test @bors r=Mark-Simulacrum |
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Aug 9, 2023
…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#113939 (open pidfd in child process and send to the parent via SOCK_SEQPACKET+CMSG) - rust-lang#114548 (Migrate a trait selection error to use diagnostic translation) - rust-lang#114606 (fix: not insert missing lifetime for `ConstParamTy`) - rust-lang#114634 (Mention riscv64-linux-android support in Android documentation) - rust-lang#114638 (Remove old RPITIT tests (revisions were removed)) - rust-lang#114641 (Rename copying `ascii::Char` methods from `as_` to `to_`) r? `@ghost` `@rustbot` modify labels: rollup
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Jan 25, 2024
…ochenkov Clean up after clone3 removal from pidfd code (docs and tests) rust-lang#113939 removed clone3 from pidfd code. This patchset does necessary clean up: fixes docs and tests
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…ochenkov Clean up after clone3 removal from pidfd code (docs and tests) rust-lang#113939 removed clone3 from pidfd code. This patchset does necessary clean up: fixes docs and tests
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Rollup merge of rust-lang#120306 - safinaskar:clone3-clean-up, r=petrochenkov Clean up after clone3 removal from pidfd code (docs and tests) rust-lang#113939 removed clone3 from pidfd code. This patchset does necessary clean up: fixes docs and tests
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This avoids using
clone3when a pidfd is requested while still getting it in a 100% race-free manner by passing it up from the child process.This should solve most concerns in #82971