bus_describe_intr man page on FreeBSD

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BUS_DESCRIBE_INTR(9)	 BSD Kernel Developer's Manual	  BUS_DESCRIBE_INTR(9)

NAME
     BUS_DESCRIBE_INTR, bus_describe_intr — associate a description with an
     active interrupt handler

SYNOPSIS
     #include <sys/param.h>
     #include <sys/bus.h>

     int
     BUS_BIND_INTR(device_t dev, device_t child, struct resource *irq,
	 void *cookie, const char *descr);

     int
     bus_describe_intr(device_t dev, struct resource *irq, void *cookie,
	 const char *fmt, ...);

DESCRIPTION
     The BUS_DESCRIBE_INTR() method associates a description with an active
     interrupt handler.	 The cookie parameter must be the value returned by a
     successful call to BUS_SETUP_INTR(9) for the interrupt irq.

     The bus_describe_intr() function is a simple wrapper around
     BUS_DESCRIBE_INTR().  As a convenience, bus_describe_intr() allows the
     caller to use printf(9) style formatting to build the description string
     using fmt.

     When an interrupt handler is established by BUS_SETUP_INTR(9), the han‐
     dler is named after the device the handler is established for.  This name
     is then used in various places such as interrupt statistics displayed by
     systat(1) and vmstat(8).  For devices that use a single interrupt, the
     device name is sufficiently unique to identify the interrupt handler.
     However, for devices that use multiple interrupts it can be useful to
     distinguish the interrupt handlers.  When a description is set for an
     active interrupt handler, a colon followed by the description is appended
     to the device name to form the interrupt handler name.

RETURN VALUES
     Zero is returned on success, otherwise an appropriate error is returned.

SEE ALSO
     BUS_SETUP_INTR(9), systat(1), vmstat(8), device(9), printf(9)

HISTORY
     The BUS_DESCRIBE_INTR() method and bus_describe_intr() functions first
     appeared in FreeBSD 8.1.

BUGS
     It is not currently possible to remove a description from an active
     interrupt handler.

BSD			       October 14, 2009				   BSD
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