Jakub Konka d43c08a3e5 Add/fix missing WASI functionality to pass libstd tests ... This rather large commit adds/fixes missing WASI functionality in `libstd` needed to pass the `libstd` tests. As such, now by default tests targeting `wasm32-wasi` target are enabled in `test/tests.zig` module. However, they can be disabled by passing the `-Dskip-wasi=true` flag when invoking the `zig build test` command. When the flag is set to `false`, i.e., when WASI tests are included, `wasmtime` with `--dir=.` is used as the default testing command. Since the majority of `libstd` tests were relying on `fs.cwd()` call to get current working directory handle wrapped in `Dir` struct, in order to make the tests WASI-friendly, `fs.cwd()` call was replaced with `testing.getTestDir()` function which resolved to either `fs.cwd()` for non-WASI targets, or tries to fetch the preopen list from the WASI runtime and extract a preopen for '.' path. The summary of changes introduced by this commit: * implement `Dir.makeDir` and `Dir.openDir` targeting WASI * implement `Dir.deleteFile` and `Dir.deleteDir` targeting WASI * fix `os.close` and map errors in `unlinkat` * move WASI-specific `mkdirat` and `unlinkat` from `std.fs.wasi` to `std.os` module * implement `lseek_{SET, CUR, END}` targeting WASI * implement `futimens` targeting WASI * implement `ftruncate` targeting WASI * implement `readv`, `writev`, `pread{v}`, `pwrite{v}` targeting WASI * make sure ANSI escape codes are _not_ used in stderr or stdout in WASI, as WASI always sanitizes stderr, and sanitizes stdout if fd is a TTY * fix specifying WASI rights when opening/creating files/dirs * tweak `AtomicFile` to be WASI-compatible * implement `os.renameatWasi` for WASI-compliant `os.renameat` function * implement sleep() targeting WASI * fix `process.getEnvMap` targeting WASI		2020-05-18 16:09:49 +02:00
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test.zig	Add/fix missing WASI functionality to pass libstd tests	2020-05-18 16:09:49 +02:00