NAME
rtl_free_irq, rtl_request_irqrtl_request_irq — install and remove realtime interrupt handlers
SYNOPSIS
#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);
DESCRIPTION
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.
RETURN VALUE
All functions return 0 on success and a negative error code on error.
ERRORS
|
-EBUSY |
rtl_request_irq: Interrupt handler is already installed for this interrupt level. | ||
|
-EINVAL |
rtl_free_irq: There is no handler currently installed for this interrupt level |
AUTHOR
Michael Barabanov (baraban [AT] fsmlabs.com (link to URL mailto:baraban [AT] fsmlabs.com) )
SEE ALSO
sigaction(2) (link to URL sigaction.2.html) , rtl_hard_enable_irq(3) (link to URL rtl_hard_enable_irq.3.html) , rtl_hard_disable_irq(3) (link to URL rtl_hard_disable_irq.3.html)
©2001 FSMLabs Inc.
All rights reserved.