NIOPosix: add Windows compatibility shims for environment APIs #3427
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Lukasa
reviewed
Oct 30, 2025
| /// Standard POSIX-style file descriptor numbers used by example code and tests. | ||
| public let STDIN_FILENO: CInt = 0 | ||
| public let STDOUT_FILENO: CInt = 1 | ||
| public let STDERR_FILENO: CInt = 2 |
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I'd strongly prefer that we made these things internal, or at most package if we need them elsewhere.
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Windows doesn't provide the POSIX helpers NIO uses (like setenv and standard file descriptor constants), causing compilation failures in NIOCrashTester and the HTTP server example.
This adds a Windows-only compatibility shim in NIOPosix that provides POSIX-style equivalents using Windows APIs (_putenv_s, etc.). This lets Windows use the same source code without #if os(Windows) scattered throughout.
Validated with swift build -c debug --product NIOPosix on Linux.