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package libcontainer
import (
"errors"
"os"
"os/exec"
"github.com/opencontainers/runc/libcontainer/system"
)
func newRestoredProcess(cmd *exec.Cmd, fds []string) (*restoredProcess, error) {
var err error
pid := cmd.Process.Pid
stat, err := system.Stat(pid)
if err != nil {
return nil, err
}
return &restoredProcess{
cmd: cmd,
processStartTime: stat.StartTime,
fds: fds,
}, nil
}
type restoredProcess struct {
cmd *exec.Cmd
processStartTime uint64
fds []string
}
func (p *restoredProcess) start() error {
return errors.New("restored process cannot be started")
}
func (p *restoredProcess) pid() int {
return p.cmd.Process.Pid
}
func (p *restoredProcess) terminate() error {
err := p.cmd.Process.Kill()
if _, werr := p.wait(); err == nil {
err = werr
}
return err
}
func (p *restoredProcess) wait() (*os.ProcessState, error) {
// TODO: how do we wait on the actual process?
// maybe use --exec-cmd in criu
err := p.cmd.Wait()
if err != nil {
var exitErr *exec.ExitError
if !errors.As(err, &exitErr) {
return nil, err
}
}
st := p.cmd.ProcessState
return st, nil
}
func (p *restoredProcess) startTime() (uint64, error) {
return p.processStartTime, nil
}
func (p *restoredProcess) signal(s os.Signal) error {
return p.cmd.Process.Signal(s)
}
func (p *restoredProcess) externalDescriptors() []string {
return p.fds
}
func (p *restoredProcess) setExternalDescriptors(newFds []string) {
p.fds = newFds
}
func (p *restoredProcess) forwardChildLogs() chan error {
return nil
}
// nonChildProcess represents a process where the calling process is not
// the parent process. This process is created when Load loads a container
// from a persisted state.
type nonChildProcess struct {
processPid int
processStartTime uint64
fds []string
}
func (p *nonChildProcess) start() error {
return errors.New("restored process cannot be started")
}
func (p *nonChildProcess) pid() int {
return p.processPid
}
func (p *nonChildProcess) terminate() error {
return errors.New("restored process cannot be terminated")
}
func (p *nonChildProcess) wait() (*os.ProcessState, error) {
return nil, errors.New("restored process cannot be waited on")
}
func (p *nonChildProcess) startTime() (uint64, error) {
return p.processStartTime, nil
}
func (p *nonChildProcess) signal(s os.Signal) error {
proc, err := os.FindProcess(p.processPid)
if err != nil {
return err
}
return proc.Signal(s)
}
func (p *nonChildProcess) externalDescriptors() []string {
return p.fds
}
func (p *nonChildProcess) setExternalDescriptors(newFds []string) {
p.fds = newFds
}
func (p *nonChildProcess) forwardChildLogs() chan error {
return nil
}
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