fff164c22e
In go1.14+, SIGURG is used by the runtime to handle preemtable system calls. In practice this signal caught *frequently*. For reference: https://go.googlesource.com/proposal/+/master/design/24543-non-cooperative-preemption.md https://github.com/golang/go/issues/37942 Signed-off-by: Brian Goff <cpuguy83@gmail.com>
58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
package container
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import (
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"context"
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"fmt"
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"os"
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gosignal "os/signal"
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"github.com/docker/cli/cli/command"
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"github.com/docker/docker/pkg/signal"
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"github.com/sirupsen/logrus"
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)
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// ForwardAllSignals forwards signals to the container
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//
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// The channel you pass in must already be setup to receive any signals you want to forward.
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func ForwardAllSignals(ctx context.Context, cli command.Cli, cid string, sigc <-chan os.Signal) {
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var s os.Signal
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for {
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select {
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case s = <-sigc:
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case <-ctx.Done():
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return
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}
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if s == signal.SIGCHLD || s == signal.SIGPIPE {
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continue
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}
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// In go1.14+, the go runtime issues SIGURG as an interrupt to support pre-emptable system calls on Linux.
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// Since we can't forward that along we'll check that here.
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if isRuntimeSig(s) {
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continue
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}
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var sig string
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for sigStr, sigN := range signal.SignalMap {
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if sigN == s {
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sig = sigStr
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break
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}
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}
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if sig == "" {
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fmt.Fprintf(cli.Err(), "Unsupported signal: %v. Discarding.\n", s)
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continue
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}
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if err := cli.Client().ContainerKill(ctx, cid, sig); err != nil {
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logrus.Debugf("Error sending signal: %s", err)
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}
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}
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}
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func notfiyAllSignals() chan os.Signal {
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sigc := make(chan os.Signal, 128)
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gosignal.Notify(sigc)
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return sigc
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}
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