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
Check Out this Related Man Page
MPROTECT(2) BSD System Calls Manual MPROTECT(2)NAME
mprotect -- control the protection of pages
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/mman.h>
int
mprotect(const void *addr, size_t len, int prot);
DESCRIPTION
The mprotect() system call changes the specified pages to have protection prot. Not all implementations will guarantee protection on a page
basis; the granularity of protection changes may be as large as an entire region. A region is the virtual address space defined by the start
and end addresses of a struct vm_map_entry.
Currently these protection bits are known, which can be combined, OR'd together:
PROT_NONE No permissions at all.
PROT_READ The pages can be read.
PROT_WRITE The pages can be written.
PROT_EXEC The pages can be executed.
RETURN VALUES
The mprotect() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
cate the error.
ERRORS
The mprotect() system call will fail if:
[EINVAL] The virtual address range specified by the addr and len arguments is not valid.
[EACCES] The calling process was not allowed to change the protection to the value specified by the prot argument.
SEE ALSO madvise(2), mincore(2), msync(2), munmap(2)HISTORY
The mprotect() system call first appeared in 4.4BSD.
BSD June 9, 1993 BSD
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