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Test Your Knowledge in Computers #933
Difficulty: Medium
Microcontrollers operating within embedded systems (such as the Raspberry Pi, Arduino, and other similar systems) always have internal hardware to keep track of time.
True or False?
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freerbuf(9f) [posix man page]

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

NAME
freerbuf - free a raw buffer header SYNOPSIS
#include <sys/buf.h> #include <sys/ddi.h> void freerbuf(struct buf *bp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
bp Pointer to a previously allocated buffer header structure. DESCRIPTION
freerbuf() frees a raw buffer header previously allocated by getrbuf(9F). This function does not sleep and so may be called from an inter- rupt routine. CONTEXT
freerbuf() can be called from user or interrupt context. SEE ALSO
getrbuf(9F), kmem_alloc(9F), kmem_free(9F), kmem_zalloc(9F) SunOS 5.10 11 Apr 1991 freerbuf(9F)

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

NAME
bioreset - reuse a private buffer header after I/O is complete SYNOPSIS
#include <sys/buf.h> #include <sys/ddi.h> void bioreset(struct buf *bp); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI) PARAMETERS
bp Pointer to the buf(9S) structure. DESCRIPTION
bioreset() is used by drivers that allocate private buffers with getrbuf(9F) or kmem_alloc(9F) and want to reuse them in multiple transfers before freeing them with freerbuf(9F) or kmem_free(9F). bioreset() resets the buffer header to the state it had when initially allocated by getrbuf() or initialized by bioinit(9F). CONTEXT
bioreset() can be called from any context. SEE ALSO
strategy(9E), bioinit(9F), biofini(9F), freerbuf(9F), getrbuf(9F), kmem_alloc(9F), kmem_free(9F), buf(9S) NOTES
bp must not describe a transfer in progress. SunOS 5.10 15 Nov 1996 bioreset(9F)

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