ptob(9F) Kernel Functions for Drivers ptob(9F)
NAME
ptob - convert size in pages to size in bytes
SYNOPSIS
#include <sys/ddi.h>
unsigned long ptob(unsigned long numpages);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
numpages Size in number of pages to convert to size in bytes.
DESCRIPTION
This function returns the number of bytes that are contained in the specified number of pages. For example, if the page size is 2048, then
ptob(2) returns 4096. ptob(0) returns 0.
RETURN VALUES
The return value is always the number of bytes in the specified number of pages. There are no invalid input values, and no checking will be
performed for overflow in the case of a page count whose corresponding byte count cannot be represented by an unsigned long. Rather, the
higher order bits will be ignored.
CONTEXT
ptob() can be called from user or interrupt context.
SEE ALSO
btop(9F), btopr(9F), ddi_ptob(9F)
Writing Device Drivers
SunOS 5.10 11 Apr 1991 ptob(9F)