Block signal masks pre-fork and restore post-fork. #35
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@swift-ci please test |
parkera
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Apr 29, 2025
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Instead of a monolithic |
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@swift-ci please test |
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On Darwin and Linux, rearchitect `TrackedFileDescriptor` (now named `DiskIO`) to either hold a `FileDescriptor` or a `DispatchIO`. We create `DispatchIO` as the last step of `spawn()` and use it to perform read/write, as well as cleanup instead of using a raw file descriptor.
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This PR introduces proper signal blocking and restoring for custom
fork/execon Linux.Resolves: iCharlesHu/Subprocess#45
Resolves: iCharlesHu/Subprocess#46
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During testing, one of the newly added tests revealed that we were not managing
DispatchIOcorrectly during early terminations on Darwin and Linux. Currently, we simply close the file descriptors in the clean-up handler, which is incorrect becauseDispatchIOis used for read/write operations on these file descriptors. Modifying the file descriptor after it has been “transferred” toDispatchIOis considered a programmer error.Rearchitect
TrackedFileDescriptor(now renamedDiskIO) to either hold aFileDescriptoror aDispatchIO. We createDispatchIOas the final step ofspawn()and use it for read/write operations and cleanup, instead of using a raw file descriptor. This allowsDispatchIOto naturally close the file descriptor itself.