src/starnix/modules/procfs/thread_self.rs

// Copyright 2025 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use starnix_core::task::CurrentTask;
use starnix_core::vfs::{FsNode, FsNodeOps, SymlinkTarget, fs_node_impl_symlink};
use starnix_sync::{FileOpsCore, Locked};
use starnix_uapi::errors::Errno;

/// A node that represents a symlink to `proc/<pid>/task/<tid>` where <pid> and <tid> are derived
/// from the task reading the symlink.
pub struct ThreadSelfSymlink;

impl ThreadSelfSymlink {
    pub fn new_node() -> impl FsNodeOps {
        Self {}
    }
}

impl FsNodeOps for ThreadSelfSymlink {
    fs_node_impl_symlink!();

    fn readlink(
        &self,
        _locked: &mut Locked<FileOpsCore>,
        _node: &FsNode,
        current_task: &CurrentTask,
    ) -> Result<SymlinkTarget, Errno> {
        Ok(SymlinkTarget::Path(
            format!("{}/task/{}", current_task.get_pid(), current_task.get_tid()).into(),
        ))
    }
}