#include <rtl_core.h> int rtl_request_irq (unsigned int irq, unsigned int (*handler)(unsigned int irq, struct pt_regs *regs)); int rtl_free_irq(unsigned int irq); |
These functions are specific to Realtime Linux. The sigaction interface is a higher level alternative. rtl_request_irq registers the function handler as the interrupt handler for IRQ level irq. The handler will be executed with hardware interrupts disabled.
Note: The interrupt will be disabled during the handler execution. If it is necessary to receive further interrupts from this device, you must reenable the interrupt line with the rtl_hard_enable_irq(3) function. It is almost always a terrible mistake to call rtl_allow_irqs in an interrupt handler.
rtl_free_irq removes the interrupt handler for IRQ level irq.
rtl_request_irq: Interrupt handler is already installed for this interrupt level.
rtl_free_irq: There is no handler currently installed for this interrupt level
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