linux man page for vm_page_protect

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