HelenOS sources

SYS_IPC_HANGUP    101 kernel/generic/src/syscall/syscall.c 	[SYS_IPC_HANGUP] = (syshandler_t) sys_ipc_hangup,
SYS_IPC_HANGUP     82 uspace/app/trace/syscalls.c 	[SYS_IPC_HANGUP] = { "ipc_hangup", 1, V_ERRNO },
SYS_IPC_HANGUP    188 uspace/lib/c/generic/ipc.c 	return (errno_t) __SYSCALL1(SYS_IPC_HANGUP, cap_handle_raw(phandle));