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//! User and Group ID types.
#![allow(unsafe_code)]
use crate::backend::c;
/// A group identifier as a raw integer.
#[cfg(not(target_os = "wasi"))]
pub type RawGid = c::gid_t;
/// A user identifier as a raw integer.
#[cfg(not(target_os = "wasi"))]
pub type RawUid = c::uid_t;
/// `uid_t`—A Unix user ID.
#[repr(transparent)]
#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
pub struct Uid(RawUid);
/// `gid_t`—A Unix group ID.
#[repr(transparent)]
#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
pub struct Gid(RawGid);
impl Uid {
/// A `Uid` corresponding to the root user (uid 0).
pub const ROOT: Self = Self(0);
/// Converts a `RawUid` into a `Uid`.
///
/// # Safety
///
/// `raw` must be the value of a valid Unix user ID.
#[inline]
pub const unsafe fn from_raw(raw: RawUid) -> Self {
Self(raw)
}
/// Converts a `Uid` into a `RawUid`.
#[inline]
pub const fn as_raw(self) -> RawUid {
self.0
}
/// Test whether this uid represents the root user (uid 0).
#[inline]
pub const fn is_root(self) -> bool {
self.0 == Self::ROOT.0
}
}
impl Gid {
/// A `Gid` corresponding to the root group (gid 0).
pub const ROOT: Self = Self(0);
/// Converts a `RawGid` into a `Gid`.
///
/// # Safety
///
/// `raw` must be the value of a valid Unix group ID.
#[inline]
pub const unsafe fn from_raw(raw: RawGid) -> Self {
Self(raw)
}
/// Converts a `Gid` into a `RawGid`.
#[inline]
pub const fn as_raw(self) -> RawGid {
self.0
}
/// Test whether this gid represents the root group (gid 0).
#[inline]
pub const fn is_root(self) -> bool {
self.0 == Self::ROOT.0
}
}
// Return the raw value of the IDs. In case of `None` it returns `!0` since it
// has the same bit pattern as `-1` indicating no change to the owner/group ID.
pub(crate) fn translate_fchown_args(owner: Option<Uid>, group: Option<Gid>) -> (RawUid, RawGid) {
let ow = match owner {
Some(o) => o.as_raw(),
None => !0,
};
let gr = match group {
Some(g) => g.as_raw(),
None => !0,
};
(ow, gr)
}
#[test]
fn test_sizes() {
assert_eq_size!(RawUid, u32);
assert_eq_size!(RawGid, u32);
}