DockerCLI/cli/command/container/signals.go

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package container
import (
"context"
"fmt"
"os"
gosignal "os/signal"
"github.com/docker/cli/cli/command"
"github.com/docker/docker/pkg/signal"
"github.com/sirupsen/logrus"
)
// ForwardAllSignals forwards signals to the container
//
// The channel you pass in must already be setup to receive any signals you want to forward.
func ForwardAllSignals(ctx context.Context, cli command.Cli, cid string, sigc <-chan os.Signal) {
var s os.Signal
for {
select {
case s = <-sigc:
case <-ctx.Done():
return
}
if s == signal.SIGCHLD || s == signal.SIGPIPE {
continue
}
// In go1.14+, the go runtime issues SIGURG as an interrupt to support pre-emptable system calls on Linux.
// Since we can't forward that along we'll check that here.
if isRuntimeSig(s) {
continue
}
var sig string
for sigStr, sigN := range signal.SignalMap {
if sigN == s {
sig = sigStr
break
}
}
if sig == "" {
fmt.Fprintf(cli.Err(), "Unsupported signal: %v. Discarding.\n", s)
continue
}
if err := cli.Client().ContainerKill(ctx, cid, sig); err != nil {
logrus.Debugf("Error sending signal: %s", err)
}
}
}
func notfiyAllSignals() chan os.Signal {
sigc := make(chan os.Signal, 128)
gosignal.Notify(sigc)
return sigc
}