libcontainer/container/
container_resume.rs

1use libcgroups::common::{CgroupManager, FreezerState};
2
3use super::{Container, ContainerStatus};
4use crate::error::LibcontainerError;
5
6impl Container {
7    /// Resumes all processes within the container
8    ///
9    /// # Example
10    ///
11    /// ```no_run
12    /// use libcontainer::container::builder::ContainerBuilder;
13    /// use libcontainer::syscall::syscall::SyscallType;
14    ///
15    /// # fn main() -> anyhow::Result<()> {
16    /// let mut container = ContainerBuilder::new(
17    ///     "74f1a4cb3801".to_owned(),
18    ///     SyscallType::default(),
19    /// )
20    /// .as_init("/var/run/docker/bundle")
21    /// .build()?;
22    ///
23    /// container.resume()?;
24    /// # Ok(())
25    /// # }
26    /// ```
27    pub fn resume(&mut self) -> Result<(), LibcontainerError> {
28        self.refresh_status()?;
29        // check if container can be resumed :
30        // for example, a running process cannot be resumed
31        if !self.can_resume() {
32            tracing::error!(status = ?self.status(), id = ?self.id(), "cannot resume container");
33            return Err(LibcontainerError::IncorrectStatus(self.status()));
34        }
35
36        let cmanager =
37            libcgroups::common::create_cgroup_manager(libcgroups::common::CgroupConfig {
38                cgroup_path: self.spec()?.cgroup_path,
39                systemd_cgroup: self.systemd(),
40                container_name: self.id().to_string(),
41            })?;
42        // resume the frozen container
43        cmanager.freeze(FreezerState::Thawed)?;
44
45        tracing::debug!("saving running status");
46        self.set_status(ContainerStatus::Running).save()?;
47
48        tracing::debug!("container {} resumed", self.id());
49        Ok(())
50    }
51}
libcontainer/container/container_resume.rs

libcontainer/container/
container_resume.rs
