starnix_core/power/
sync_on_suspend.rs

1// Copyright 2023 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use crate::task::CurrentTask;
6use crate::vfs::FsNodeOps;
7use crate::vfs::pseudo::simple_file::{BytesFile, BytesFileOps, parse_i32_file};
8use starnix_uapi::error;
9use starnix_uapi::errors::Errno;
10use std::borrow::Cow;
11
12pub struct PowerSyncOnSuspendFile;
13
14impl PowerSyncOnSuspendFile {
15    pub fn new_node() -> impl FsNodeOps {
16        BytesFile::new_node(Self {})
17    }
18}
19
20impl BytesFileOps for PowerSyncOnSuspendFile {
21    fn write(&self, current_task: &CurrentTask, data: Vec<u8>) -> Result<(), Errno> {
22        let value = parse_i32_file(&data)?;
23        let enabled = match value {
24            0 => false,
25            1 => true,
26            _ => return error!(EINVAL),
27        };
28        current_task.kernel().suspend_resume_manager.set_sync_on_suspend(enabled);
29        Ok(())
30    }
31
32    fn read(&self, current_task: &CurrentTask) -> Result<Cow<'_, [u8]>, Errno> {
33        let bytes = if current_task.kernel().suspend_resume_manager.sync_on_suspend_enabled() {
34            b"1\n"
35        } else {
36            b"0\n"
37        };
38        Ok(bytes.into())
39    }
40}
starnix_core/power/sync_on_suspend.rs

starnix_core/power/
sync_on_suspend.rs
