Function getPath

system/lib/wasmfs/emscripten.cpp:28–52

Given an fd, returns the string path that the fd refers to. TODO: full error handling TODO: maybe make this a public API, as it is useful for debugging

// TODO: full error handling
// TODO: maybe make this a public API, as it is useful for debugging
std::string getPath(int fd) {
  auto fileTable = wasmfs::wasmFS.getFileTable().locked();

  auto openFile = fileTable.getEntry(fd);
  if (!openFile) {
    return "!";
  }

  auto curr = openFile->locked().getFile();
  std::string result = "";
  while (curr != wasmfs::wasmFS.getRootDirectory()) {
    auto parent = curr->locked().getParent();
    // Check if the parent exists. The parent may not exist if curr was
    // unlinked.
    if (!parent) {
      return "?/" + result;
    }

    auto parentDir = parent->dynCast<wasmfs::Directory>();
    auto name = parentDir->locked().getName(curr);
    result = '/' + name + result;
    curr = parentDir;
  }
  return result;
}

} // namespace wasmfs