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sysfs: always reopen directory before readdir #2355

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sysfs: always reopen directory before readdir #2355

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11 changes: 9 additions & 2 deletions internal/sysfs/osfile.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,6 @@ import (
"io"
"io/fs"
"os"
"runtime"

experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
"github.com/tetratelabs/wazero/internal/fsapi"
Expand All @@ -15,7 +14,15 @@ func newOsFile(path string, flag experimentalsys.Oflag, perm fs.FileMode, f *os.
// Windows cannot read files written to a directory after it was opened.
// This was noticed in #1087 in zig tests. Use a flag instead of a
// different type.
reopenDir := runtime.GOOS == "windows"
//
// As POSIX states, if a file is removed from or added to the directory
// after the most recent call to opendir() or rewinddir(), whether a
// subsequent call to readdir() returns an entry for that file is unspecified.
//
// So there is no guarantee that files added after opendir() will be visible
// in readdir(). We need to reopendir() to get the new state of the directory
// before readdir().
reopenDir := true
return &osFile{path: path, flag: flag, perm: perm, reopenDir: reopenDir, file: f, fd: f.Fd()}
}

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