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VM_PAGE_PROTECT(9) | Kernel Developer's Manual | VM_PAGE_PROTECT(9) |
NAME¶
vm_page_protect — lower a page's protectionSYNOPSIS¶
#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 atVM_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 thePG_WRITABLE
andPG_MAPPED
flags are cleared and the pmap_page's protection is set toVM_PROT_NONE
. IfVM_PROT_READ
is specified, then thePG_WRITABLE
flag is cleared and the pmap_page's protection is set toVM_PROT_READ
.
AUTHORS¶
This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩.July 14, 2001 | Debian |