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use crate::ProcResult;
#[cfg(feature = "serde1")]
use serde::{Deserialize, Serialize};
use std::io::BufRead;
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
/// Container group controller information.
pub struct CGroupController {
/// The name of the controller.
pub name: String,
/// The unique ID of the cgroup hierarchy on which this controller is mounted.
///
/// If multiple cgroups v1 controllers are bound to the same hierarchy, then each will show
/// the same hierarchy ID in this field. The value in this field will be 0 if:
///
/// * the controller is not mounted on a cgroups v1 hierarchy;
/// * the controller is bound to the cgroups v2 single unified hierarchy; or
/// * the controller is disabled (see below).
pub hierarchy: u32,
/// The number of control groups in this hierarchy using this controller.
pub num_cgroups: u32,
/// This field contains the value `true` if this controller is enabled, or `false` if it has been disabled
pub enabled: bool,
}
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
/// Container group controller information.
// This contains a vector, but if each subsystem name is unique, maybe this can be a
// hashmap instead
pub struct CGroupControllers(pub Vec<CGroupController>);
impl crate::FromBufRead for CGroupControllers {
fn from_buf_read<R: BufRead>(reader: R) -> ProcResult<Self> {
let mut vec = Vec::new();
for line in reader.lines() {
let line = line?;
if line.starts_with('#') {
continue;
}
let mut s = line.split_whitespace();
let name = expect!(s.next(), "name").to_owned();
let hierarchy = from_str!(u32, expect!(s.next(), "hierarchy"));
let num_cgroups = from_str!(u32, expect!(s.next(), "num_cgroups"));
let enabled = expect!(s.next(), "enabled") == "1";
vec.push(CGroupController {
name,
hierarchy,
num_cgroups,
enabled,
});
}
Ok(CGroupControllers(vec))
}
}
/// Information about a process cgroup
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub struct ProcessCGroup {
/// For cgroups version 1 hierarchies, this field contains a unique hierarchy ID number
/// that can be matched to a hierarchy ID in /proc/cgroups. For the cgroups version 2
/// hierarchy, this field contains the value 0.
pub hierarchy: u32,
/// For cgroups version 1 hierarchies, this field contains a comma-separated list of the
/// controllers bound to the hierarchy.
///
/// For the cgroups version 2 hierarchy, this field is empty.
pub controllers: Vec<String>,
/// This field contains the pathname of the control group in the hierarchy to which the process
/// belongs.
///
/// This pathname is relative to the mount point of the hierarchy.
pub pathname: String,
}
/// Information about process cgroups.
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub struct ProcessCGroups(pub Vec<ProcessCGroup>);
impl crate::FromBufRead for ProcessCGroups {
fn from_buf_read<R: BufRead>(reader: R) -> ProcResult<Self> {
let mut vec = Vec::new();
for line in reader.lines() {
let line = line?;
if line.starts_with('#') {
continue;
}
let mut s = line.splitn(3, ':');
let hierarchy = from_str!(u32, expect!(s.next(), "hierarchy"));
let controllers = expect!(s.next(), "controllers")
.split(',')
.map(|s| s.to_owned())
.collect();
let pathname = expect!(s.next(), "path").to_owned();
vec.push(ProcessCGroup {
hierarchy,
controllers,
pathname,
});
}
Ok(ProcessCGroups(vec))
}
}
impl IntoIterator for ProcessCGroups {
type IntoIter = std::vec::IntoIter<ProcessCGroup>;
type Item = ProcessCGroup;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl<'a> IntoIterator for &'a ProcessCGroups {
type IntoIter = std::slice::Iter<'a, ProcessCGroup>;
type Item = &'a ProcessCGroup;
fn into_iter(self) -> Self::IntoIter {
self.0.iter()
}
}