Goldfishd (Android Emulator Daemon) is a daemon for getting messages sent from the host when running Chrome OS inside the Android Emulator. Because the code name of virtual hardware provided by Android Emulator is goldfish, we call it Goldfishd. It's only available on test images for testing/development purposes.
This daemon opens /dev/goldfish_pipe to read messages from it. Messages from the host trigger different actions inside Chrome OS. See goldfishd::message in goldfish_library.h for all supported messages.