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use super::{Container, ContainerStatus};
use anyhow::{bail, Context, Result};
use libcgroups::common::FreezerState;
impl Container {
/// Suspends all processes within the container
///
/// # Example
///
/// ```no_run
/// use libcontainer::container::builder::ContainerBuilder;
/// use libcontainer::syscall::syscall::create_syscall;
///
/// # fn main() -> anyhow::Result<()> {
/// let mut container = ContainerBuilder::new("74f1a4cb3801".to_owned(), create_syscall().as_ref())
/// .as_init("/var/run/docker/bundle")
/// .build()?;
///
/// container.pause()?;
/// # Ok(())
/// # }
/// ```
pub fn pause(&mut self) -> Result<()> {
self.refresh_status()
.context("failed to refresh container status")?;
if !self.can_pause() {
bail!(
"{} could not be paused because it was {:?}",
self.id(),
self.status()
);
}
let cgroups_path = self.spec()?.cgroup_path;
let use_systemd = self
.systemd()
.context("container state does not contain cgroup manager")?;
let cmanager =
libcgroups::common::create_cgroup_manager(cgroups_path, use_systemd, self.id())?;
cmanager.freeze(FreezerState::Frozen)?;
log::debug!("saving paused status");
self.set_status(ContainerStatus::Paused).save()?;
log::debug!("container {} paused", self.id());
Ok(())
}
}