IEEE1284_GET_IRQ_FD - Online Linux Manual PageSection : 3
Updated : 11/11/2010
Source : [FIXME: source]
Note : Functions

NAMEieee1284_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);

DESCRIPTIONIf 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 VALUEFor 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)​.

AUTHORTim Waugh <​twaugh@redhat.com​> Author.

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Copyright © 2001-2003 Tim Waugh
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