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package terminal
import (
"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/pkg/errors"
"github.com/sirupsen/logrus"
)
// Make sure the signal buffer is sufficiently big.
// runc is using the same value.
const signalBufferSize = 2048
// 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, signalBufferSize)
signal.CatchAll(sigBuffer)
logrus.Debugf("Enabling signal proxying")
go func() {
for s := range sigBuffer {
// Ignore SIGCHLD and SIGPIPE - these are mostly likely
// intended for the podman command itself.
// SIGURG was added because of golang 1.14 and its preemptive changes
// causing more signals to "show up".
// https://github.com/containers/podman/issues/5483
if s == syscall.SIGCHLD || s == syscall.SIGPIPE || s == syscall.SIGURG {
continue
}
if err := ctr.Kill(uint(s.(syscall.Signal))); err != nil {
if errors.Cause(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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