.IX \f4clrbuf\fP(D3DK)

NAME

clrbuf − erase the contents of a buffer

SYNOPSIS

#include <sys/types.h>
#include <sys/buf.h>
void clrbuf(buf_t ∗bp);

ARGUMENTS

bpPointer to the buffer header structure. 

DESCRIPTION

The clrbuf function zeros a buffer and sets the b_resid member of the buf(D4DK) structure to 0.  Zeros are placed in the buffer starting at the address specified by b_un.b_addr for a length of b_bcount bytes. 

If the buffer has the B_PAGEIO flag set in the b_flags field, then clrbuf should not be called until the proper virtual space has been allocated by a call to bp_mapin(D3DK).  .IX \f4buf\fP(D4DK)

RETURN VALUE

None. 

LEVEL

Base or Interrupt. 

NOTES

Does not sleep. 

Driver-defined basic locks, read/write locks, and sleep locks may be held across calls to this function. 

SEE ALSO

bp_mapin(D3DK), buf(D4DK)

DDI/DKI