#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
Fa 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
Vt 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
Rv -std mprotect
ERRORS
The
mprotect ();
system call will fail if:
Bq Er EINVAL
The virtual address range specified by the
Fa addr
and
Fa len
arguments is not valid.
Bq Er EACCES
The calling process was not allowed to change
the protection to the value specified by
the
Fa prot
argument.
