HelenOS sources

IPC_TEST_PING     105 uspace/lib/ipctest/src/ipc_test.c 	retval = async_req_0_0(exch, IPC_TEST_PING);
IPC_TEST_PING     311 uspace/srv/test/ipc-test/main.c 		case IPC_TEST_PING:
HelenOS homepage, sources at GitHub