Martin Taillefer <******@****.***> 1572291239 -0700

John Howard <******@****.***> 1712595956 -0700

Rama Chavali <******@****.***> 1657816233 +0530

Martin Taillefer <******@****.***> 1572291239 -0700

John Howard <******@****.***> 1572058059 -0700

John Howard <******@****.***> 1619132365 -0700

Martin Taillefer <******@****.***> 1572291239 -0700

John Howard <******@****.***> 1643929095 -0800

  chmod +x "$2"

  # Make a copy named just "ztunnel" in the same directory (overwrite if necessary).
  echo "Copying $2 to $(dirname "$2")/${3}"
  cp -f "$2" "$(dirname "$2")/${3}"
  popd

  # Also copy it to out/$os_arch/ztunnel as that's whats used in the build
  echo "Copying '${2}' to ${TARGET_OUT_LINUX}/ztunnel"
  cp -f "${2}" "${TARGET_OUT_LINUX}/ztunnel"
}

function maybe_build_ztunnel() {

  std::unique_ptr<char[]> buffer(new char[kPosixCopyFileBufferSize]);

  off_t offset = 0;
  int bytes_transferred = 0;
  int rc = 1;
  // When `sendfile` returns 0 we stop copying and let callers handle this.
  while (offset < size && rc > 0) {
    size_t chunk = size - offset;
    if (chunk > kPosixCopyFileBufferSize) chunk = kPosixCopyFileBufferSize;

    rc = read(src_fd, buffer.get(), chunk);