Linux I/O port programming mini-HOWTO: Interrupts (IRQs) and DMA access 3. Interrupts (IRQs) and DMA accessYou cannot use IRQs or DMA directly from a user-mode process. You need to write a kernel driver; see The Linux Kernel Hacker's Guide for details and the kernel source code for examples.Also, you cannot disable interrupts from within a user-mode program. g