Expose platform-specific process file descriptors #101
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iCharlesHu
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…r Linux # Conflicts: # Sources/Subprocess/API.swift
… to create a temporary user
…low a uniform shape
Expose the pidfd on Linux and process/thread HANDLEs on Windows. This is necessary for interop with certain platform-native APIs, especially on Windows. pidfds are also gaining the ability to be used for more and more with each Linux kernel release. One test has been introduced which shows how this API could be used to associate a subprocess with a Job Object using the Windows API, and for Linux, a "test" that shows one use case for access to the raw fd, which is to read the globally unique (to the boot session) identifier for the process, allowing processes sharing the same PID to be distinguished. FreeBSD also has the concept of process file descriptors, and would expect to expose the same ProcessIdentifier API as for Linux. This may spread to other platforms in the future.
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Expose the pidfd on Linux and process/thread HANDLEs on Windows. This is necessary for interop with certain platform-native APIs, especially on Windows. pidfds are also gaining the ability to be used for more and more with each Linux kernel release.
One test has been introduced which shows how this API could be used to associate a subprocess with a Job Object using the Windows API, and for Linux, a "test" that shows one use case for access to the raw fd, which is to read the globally unique (to the boot session) identifier for the process, allowing processes sharing the same PID to be distinguished.
FreeBSD also has the concept of process file descriptors, and would expect to expose the same ProcessIdentifier API as for Linux. This may spread to other platforms in the future.
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Somewhat related article with some good info: https://gaultier.github.io/blog/way_too_many_ways_to_wait_for_a_child_process_with_a_timeout.html