64 lines
1.5 KiB
Rust
64 lines
1.5 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use core::sync::atomic::{AtomicU32, Ordering};
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use atomic_integer_wrapper::define_atomic_version_of_integer_like_type;
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use crate::prelude::*;
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Pod)]
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#[repr(C)]
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pub struct Uid(u32);
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const ROOT_UID: u32 = 0;
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impl Uid {
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/// The invalid UID, typically used to indicate that no valid UID is found when returning to user space.
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///
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/// Reference: <https://elixir.bootlin.com/linux/v6.15/source/include/linux/uidgid.h#L50>.
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pub const INVALID: Uid = Self::new(u32::MAX);
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/// The overflow UID, typically used to indicate that user mappings between namespaces fail.
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///
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/// This is currently a constant (65534 is usually the "nobody" user), but it should be
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/// configured via `/proc/sys/kernel/overflowuid`.
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///
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/// Reference: <https://elixir.bootlin.com/linux/v6.15/source/kernel/sys.c#L166>.
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pub const OVERFLOW: Uid = Self::new(65534);
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pub const fn new_root() -> Self {
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Self(ROOT_UID)
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}
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pub const fn new(uid: u32) -> Self {
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Self(uid)
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}
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pub const fn is_root(&self) -> bool {
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self.0 == ROOT_UID
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}
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}
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impl From<u32> for Uid {
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fn from(value: u32) -> Self {
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Self::new(value)
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}
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}
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impl From<Uid> for u32 {
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fn from(value: Uid) -> Self {
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value.0
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}
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}
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define_atomic_version_of_integer_like_type!(Uid, {
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#[derive(Debug)]
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pub(super) struct AtomicUid(AtomicU32);
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});
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impl Clone for AtomicUid {
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fn clone(&self) -> Self {
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Self::new(self.load(Ordering::Relaxed))
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}
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}
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