VM_PAGE_PROTECT(9) BSD Kernel Developer's Manual VM_PAGE_PROTECT(9)
NAME
vm_page_protect -- lower a page's protection
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
void
vm_page_protect(vm_page_t mem, int prot);
DESCRIPTION
The vm_page_protect() function lowers a page's protection. The protection is never raised by this function; therefore, if the page is
already at VM_PROT_NONE, the function does nothing.
Its arguments are:
mem The page whose protection is lowered.
prot The protection the page should be reduced to. If VM_PROT_NONE is specified, then the PG_WRITABLE and PG_MAPPED flags are cleared and
the pmap_page's protection is set to VM_PROT_NONE. If VM_PROT_READ is specified, then the PG_WRITABLE flag is cleared and the
pmap_page's protection is set to VM_PROT_READ.
Higher protection requests are ignored.
AUTHORS
This manual page was written by Chad David <davidc@acns.ab.ca>.
BSD
July 14, 2001 BSD
