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//go:build linux || freebsd
// +build linux freebsd
package terminal
import (
"errors"
"os"
"syscall"
"github.com/containers/podman/v4/libpod"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/libpod/shutdown"
"github.com/containers/podman/v4/pkg/signal"
"github.com/sirupsen/logrus"
)
// ProxySignals ...
func ProxySignals(ctr *libpod.Container) {
// Stop catching the shutdown signals (SIGINT, SIGTERM) - they're going
// to the container now.
shutdown.Stop() //nolint: errcheck
sigBuffer := make(chan os.Signal, signal.SignalBufferSize)
signal.CatchAll(sigBuffer)
logrus.Debugf("Enabling signal proxying")
go func() {
for s := range sigBuffer {
syscallSignal := s.(syscall.Signal)
if signal.IsSignalIgnoredBySigProxy(syscallSignal) {
continue
}
if err := ctr.Kill(uint(syscallSignal)); err != nil {
if errors.Is(err, define.ErrCtrStateInvalid) {
logrus.Infof("Ceasing signal forwarding to container %s as it has stopped", ctr.ID())
} else {
logrus.Errorf("forwarding signal %d to container %s: %v", s, ctr.ID(), err)
}
// If the container dies, and we find out here,
// we need to forward that one signal to
// ourselves so that it is not lost, and then
// we terminate the proxy and let the defaults
// play out.
signal.StopCatch(sigBuffer)
if err := syscall.Kill(syscall.Getpid(), s.(syscall.Signal)); err != nil {
logrus.Errorf("Failed to kill pid %d", syscall.Getpid())
}
return
}
}
}()
}
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