[starnix] Add DynamicFile for files in procfs

Previously files in proc fs that use SeqFile had to implement FileOps
explicitly. This CL adds DynamicFile which implements FileOps for these
files and makes code simpler. The new implementation also ensure that
seek() behavior is consistent with linux.

Bug: 125672
Change-Id: Ib8f6836aa9b0d8bd11a79677fcebe000d36de27f
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/850537
Reviewed-by: Theodore Dubois <tbodt@google.com>
Commit-Queue: Sergey Ulanov <sergeyu@google.com>
12 files changed
tree: 91f8837389daff440657167fc93858cefa311644
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. infra/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gitmodules
  21. .gn
  22. .ignore
  23. .style.yapf
  24. analysis_options.yaml
  25. AUTHORS
  26. BUILD.gn
  27. CODE_OF_CONDUCT.md
  28. CONTRIBUTING.md
  29. fuchsia.code-workspace
  30. LICENSE
  31. OWNERS
  32. PATENTS
  33. pyrightconfig.json
  34. README.md
  35. rustfmt.toml
README.md

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