mmarinus

mmarinus crate 使用安全语义封装了底层系统的 mmap() 调用。

例如

use mmarinus::{Map, perms};

let mut zero = std::fs::File::open("/dev/zero").unwrap();

let map = Map::bytes(32)
    .near(128 * 1024 * 1024)
    .from(&mut zero, 0)
    .with(perms::Read)
    .unwrap();

assert_eq!(&*map, &[0; 32]);

您还可以重新映射现有映射

use mmarinus::{Map, perms};

let mut zero = std::fs::File::open("/dev/zero").unwrap();

let mut map = Map::bytes(32)
    .anywhere()
    .from(&mut zero, 0)
    .with(perms::Read)
    .unwrap();

assert_eq!(&*map, &[0; 32]);

let mut map = map.remap()
    .from(&mut zero, 0)
    .with(perms::ReadWrite)
    .unwrap();

assert_eq!(&*map, &[0; 32]);
for i in map.iter_mut() {
    *i = 255;
}
assert_eq!(&*map, &[255; 32]);

或者，您只需更改权限

use mmarinus::{Map, perms};

let mut zero = std::fs::File::open("/dev/zero").unwrap();

let mut map = Map::bytes(32)
    .at(128 * 1024 * 1024)
    .from(&mut zero, 0)
    .with(perms::Read)
    .unwrap();

assert_eq!(&*map, &[0; 32]);

let mut map = map.reprotect(perms::ReadWrite).unwrap();

assert_eq!(&*map, &[0; 32]);
for i in map.iter_mut() {
    *i = 255;
}
assert_eq!(&*map, &[255; 32]);

将整个文件映射到内存中很容易

use mmarinus::{Map, Private, perms};

let map = Map::load("/etc/os-release", Private, perms::Read).unwrap();

许可证：Apache-2.0