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aya/ebpf/aya-ebpf/src/btf_maps/stack.rs

54 lines
1.5 KiB
Rust

use core::{cell::UnsafeCell, mem, ptr};
use crate::{
bindings::bpf_map_type::BPF_MAP_TYPE_STACK,
btf_maps::AyaBtfMapMarker,
helpers::{bpf_map_pop_elem, bpf_map_push_elem},
};
#[allow(dead_code)]
pub struct StackDef<T, const M: usize, const F: usize = 0> {
r#type: *const [i32; BPF_MAP_TYPE_STACK as usize],
value: *const T,
max_entries: *const [i32; M],
// Anonymize the struct.
_anon: AyaBtfMapMarker,
}
#[repr(transparent)]
pub struct Stack<T, const M: usize, const F: usize = 0>(UnsafeCell<StackDef<T, M, F>>);
impl<T, const M: usize, const F: usize> Stack<T, M, F> {
pub const fn new() -> Self {
Self(UnsafeCell::new(StackDef {
r#type: &[0i32; BPF_MAP_TYPE_STACK as usize],
value: ptr::null(),
max_entries: &[0i32; M],
_anon: AyaBtfMapMarker::new(),
}))
}
pub fn push(&mut self, value: &T, flags: u64) -> Result<(), i64> {
let ret = unsafe {
bpf_map_push_elem(
&mut self.0 as *mut _ as *mut _,
value as *const _ as *const _,
flags,
)
};
(ret == 0).then_some(()).ok_or(ret)
}
pub fn pop(&mut self) -> Option<T> {
unsafe {
let mut value = mem::MaybeUninit::uninit();
let ret = bpf_map_pop_elem(
&mut self.0 as *mut _ as *mut _,
value.as_mut_ptr() as *mut _,
);
(ret == 0).then_some(value.assume_init())
}
}
}