vm_page_protect9freebsd
Lower a page's protection
Usage
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
void
vm_page_protect(vm_page_t mem, int prot);
Overview
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.
Releases
3 releases since Debian 5.0 (Lenny); the text changed 2 times.