jD91mZM2
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
use std::{
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fs::File,
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io,
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os::unix::io::AsRawFd,
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slice
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};
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fn from_syscall_error(error: syscall::Error) -> io::Error {
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io::Error::from_raw_os_error(error.errno as i32)
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}
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fn main() -> Result<(), io::Error> {
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let file1 = File::open("shm:example")?;
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let file2 = File::open("shm:example")?;
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let one = unsafe {
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slice::from_raw_parts_mut(
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syscall::fmap(file1.as_raw_fd() as usize, &syscall::Map {
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offset: 0,
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size: 128,
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flags: syscall::PROT_READ | syscall::PROT_WRITE
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}).map_err(from_syscall_error)? as *mut u8,
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128
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)
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};
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let two = unsafe {
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slice::from_raw_parts_mut(
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syscall::fmap(file2.as_raw_fd() as usize, &syscall::Map {
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offset: 64,
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size: 64,
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flags: syscall::PROT_READ | syscall::PROT_WRITE
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}).map_err(from_syscall_error)? as *mut u8,
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64
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)
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};
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println!("Testing writing between");
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for i in 0..128 {
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one[i as usize] = i;
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}
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for i in 0..64 {
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assert_eq!(two[i as usize], 64 + i);
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}
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println!("Testing fpath");
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let mut buf = [0; 128];
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let len = syscall::fpath(file1.as_raw_fd() as usize, &mut buf).map_err(from_syscall_error)?;
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assert_eq!(&buf[..len], b"shm:example");
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Ok(())
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}
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