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anocancel(9f) [bsd man page]

anocancel(9F)						   Kernel Functions for Drivers 					     anocancel(9F)

NAME
anocancel - prevent cancellation of asynchronous I/O request SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> int anocancel( ); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). DESCRIPTION
anocancel() should be used by drivers that do not support canceling asynchronous I/O requests. anocancel() is passed as the driver cancel routine parameter to aphysio(9F). RETURN VALUES
anocancel() returns ENXIO. SEE ALSO
aread(9E), awrite(9E), aphysio(9F) Writing Device Drivers SunOS 5.10 9 Nov 1994 anocancel(9F)

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aphysio(9F)						   Kernel Functions for Drivers 					       aphysio(9F)

NAME
aphysio - perform asynchronous physical I/O SYNOPSIS
#include <sys/types.h> #include <sys/buf.h> #include <sys/uio.h> #include <sys/aio_req.h> #include <sys/ddi.h> #include <sys/sunddi.h> int aphysio(int (*strat)(struct buf *), int (*cancel)(struct buf *), dev_t dev, int rw, void (*mincnt)(struct buf *), struct aio_req *aio_reqp); PARAMETERS
strat Pointer to device strategy routine. cancel Pointer to driver cancel routine. Used to cancel a submitted request. The driver must pass the address of the function anocancel(9F) because cancellation is not supported. dev The device number. rw Read/write flag. This is either B_READ when reading from the device or B_WRITE when writing to the device. mincnt Routine which bounds the maximum transfer unit size. aio_reqp Pointer to the aio_req(9S) structure which describes the user I/O request. INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). DESCRIPTION
aphysio() performs asynchronous I/O operations between the device and the address space described by aio_reqp->aio_uio. Prior to the start of the transfer, aphysio() verifies the requested operation is valid. It then locks the pages involved in the I/O transfer so they can not be paged out. The device strategy routine, strat, is then called one or more times to perform the physical I/O operations. aphysio() does not wait for each transfer to complete, but returns as soon as the necessary requests have been made. aphysio() calls mincnt to bound the maximum transfer unit size to a sensible default for the device and the system. Drivers which do not provide their own local mincnt routine should call aphysio() with minphys(9F). minphys(9F) is the system mincnt routine. minphys(9F) ensures the transfer size does not exceed any system limits. If a driver supplies a local mincnt routine, this routine should perform the following actions: o If bp->b_bcount exceeds a device limit, set bp->b_bcount to a value supported by the device. o Call minphys(9F) to ensure that the driver does not circumvent additional system limits. RETURN VALUES
aphysio() returns: 0 Upon success. non-zero Upon failure. CONTEXT
aphysio() can be called from user context only. SEE ALSO
aread(9E), awrite(9E), strategy(9E), anocancel(9F), biodone(9F), biowait(9F), minphys(9F), physio(9F), aio_req(9S), buf(9S), uio(9S) Writing Device Drivers WARNINGS
It is the driver's responsibility to call biodone(9F) when the transfer is complete. BUGS
Cancellation is not supported in this release. The address of the function anocancel(9F) must be used as the cancel argument. SunOS 5.10 9 Nov 1994 aphysio(9F)

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