Function mremap

pub unsafe fn mremap(
    addr: *const c_void,
    old_len: usize,
    new_len: usize,
    flags: i32,
    new_addr: *const c_void,
) -> Result<*const c_void, i32> 

Available on crate feature dep_nc only.

Remap a virtual memory address

Examples

use std::ffi::c_void;
use std::ptr;

// Initialize an anonymous mapping with 2 pages.
let map_length = 2 * nc::PAGE_SIZE;

let addr = unsafe {
    nc::mmap(
        ptr::null(),
        map_length,
        nc::PROT_READ | nc::PROT_WRITE,
        nc::MAP_PRIVATE | nc::MAP_ANONYMOUS,
        -1,
        0,
    )
};
assert!(addr.is_ok());
let addr: *const c_void = addr.unwrap();

let new_map_length = 4 * nc::PAGE_SIZE;
let new_addr = unsafe {
    nc::mremap(
        addr,
        map_length,
        new_map_length,
        nc::MREMAP_MAYMOVE,
        ptr::null(),
    )
};
if let Err(errno) = new_addr {
    eprintln!("mremap() err: {}", nc::strerror(errno));
}
assert!(new_addr.is_ok());
let new_addr: *const c_void = new_addr.unwrap();

let ret = unsafe { nc::munmap(new_addr, map_length) };
assert!(ret.is_ok());
unsafe { nc::exit(0) };