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IEEE1284_GET_IRQ_FD(3)		   Functions		IEEE1284_GET_IRQ_FD(3)

NAME
       ieee1284_get_irq_fd, ieee1284_clear_irq - interrupt notification

SYNOPSIS
       #include <ieee1284.h>

       int ieee1284_get_irq_fd(struct parport *port);

       int ieee1284_clear_irq(struct parport *port, unsigned int *count);

DESCRIPTION
       If the port has a configured interrupt line and the port type supports
       interrupt notification, it is possible to obtain a file descriptor that
       may be used for select(2) or poll(2). Any event (readable, writable or
       exception) means that an interrupt has been triggered. No operations
       other than select or poll may be performed on the file descriptor.

       The port must be open in order to call ieee1284_get_irq_fd, and must be
       claimed when using select or poll.

       The caller must not close the file descriptor, and may not use it at
       all when the port is not claimed.

       When an interrupt has been detected, the caller must call
       ieee1284_clear_irq to clear the interrupt condition, at which point the
       number of interrupts raised can be obtained by supplying a non-NULL
       count.

RETURN VALUE
       For ieee1284_get_irq_fd: If the return value is negative then it is an
       error code listed below. Otherwise it is a valid file descriptor.

       E1284_NOTAVAIL
	   No such file descriptor is available.

       E1284_INVALIDPORT
	   The port parameter is invalid (for instance, perhaps the port is
	   not open).

       For ieee1284_clear_irq:

       E1284_OK
	   The interrupt has been cleared. If count was not NULL the count of
	   interrupts has been atomically stored to count and reset.

       E1284_NOTAVAIL
	   The count parameter was not NULL but interrupt counting is not
	   supported on this type of port. The interrupt has been cleared.

       E1284_SYS
	   There was a problem clearing the interrupt.

       E1284_INVALIDPORT
	   The port parameter is invalid (for instance, perhaps the port is
	   not claimed).

AUTHOR
       Tim Waugh <twaugh@redhat.com>
	   Author.

COPYRIGHT
       Copyright © 2001-2003 Tim Waugh

				  09/18/2007		IEEE1284_GET_IRQ_FD(3)

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