getrbuf(9F) Kernel Functions for Drivers getrbuf(9F)NAME
getrbuf - get a raw buffer header
SYNOPSIS
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/ddi.h>
struct buf *getrbuf(int sleepflag);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
sleepflag Indicates whether driver should sleep for free space.
DESCRIPTION
getrbuf() allocates the space for a buffer header to the caller. It is used in cases where a block driver is performing raw (character
interface) I/O and needs to set up a buffer header that is not associated with the buffer cache.
getrbuf() calls kmem_alloc(9F) to perform the memory allocation.
kmem_alloc()requires the information included in the sleepflag argument. If sleepflag is set to KM_SLEEP, the driver may sleep until
the space is freed up. If sleepflag is set to KM_NOSLEEP, the driver will not sleep. In either case, a pointer to the allocated space
is returned or NULL to indicate that no space was available.
RETURN VALUES
getrbuf() returns a pointer to the allocated buffer header, or NULL if no space is available.
CONTEXT
getrbuf() can be called from user or interrupt context. (Drivers must not allow getrbuf() to sleep if called from an interrupt routine.)
SEE ALSO bioinit(9F), freerbuf(9F), kmem_alloc(9F), kmem_free(9F)
Writing Device Drivers
SunOS 5.10 20 Nov 1996 getrbuf(9F)
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getrbuf(9F) Kernel Functions for Drivers getrbuf(9F)NAME
getrbuf - get a raw buffer header
SYNOPSIS
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/ddi.h>
struct buf *getrbuf(int sleepflag);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
sleepflag Indicates whether driver should sleep for free space.
DESCRIPTION
getrbuf() allocates the space for a buffer header to the caller. It is used in cases where a block driver is performing raw (character
interface) I/O and needs to set up a buffer header that is not associated with the buffer cache.
getrbuf() calls kmem_alloc(9F) to perform the memory allocation.
kmem_alloc()requires the information included in the sleepflag argument. If sleepflag is set to KM_SLEEP, the driver may sleep until
the space is freed up. If sleepflag is set to KM_NOSLEEP, the driver will not sleep. In either case, a pointer to the allocated space
is returned or NULL to indicate that no space was available.
RETURN VALUES
getrbuf() returns a pointer to the allocated buffer header, or NULL if no space is available.
CONTEXT
getrbuf() can be called from user or interrupt context. (Drivers must not allow getrbuf() to sleep if called from an interrupt routine.)
SEE ALSO bioinit(9F), freerbuf(9F), kmem_alloc(9F), kmem_free(9F)
Writing Device Drivers
SunOS 5.10 20 Nov 1996 getrbuf(9F)
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