HelenOS sources

ipc_irq_unsubscribe  401 kernel/generic/src/ipc/irq.c errno_t ipc_irq_unsubscribe(answerbox_t *box, cap_irq_handle_t handle)
ipc_irq_unsubscribe   82 uspace/lib/c/generic/irq.c errno_t ipc_irq_unsubscribe(cap_irq_handle_t cap)
HelenOS homepage, sources at GitHub