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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"context"
"fmt"
"strconv"
"strings"
"syscall"
"flag"
"github.com/google/subcommands"
"golang.org/x/sys/unix"
"gvisor.googlesource.com/gvisor/runsc/boot"
"gvisor.googlesource.com/gvisor/runsc/container"
)
// Kill implements subcommands.Command for the "kill" command.
type Kill struct {
all bool
pid int
}
// Name implements subcommands.Command.Name.
func (*Kill) Name() string {
return "kill"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Kill) Synopsis() string {
return "sends a signal to the container"
}
// Usage implements subcommands.Command.Usage.
func (*Kill) Usage() string {
return `kill <container id> [signal]`
}
// SetFlags implements subcommands.Command.SetFlags.
func (k *Kill) SetFlags(f *flag.FlagSet) {
f.BoolVar(&k.all, "all", false, "send the specified signal to all processes inside the container")
f.IntVar(&k.pid, "pid", 0, "send the specified signal to a specific process")
}
// Execute implements subcommands.Command.Execute.
func (k *Kill) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if f.NArg() == 0 || f.NArg() > 2 {
f.Usage()
return subcommands.ExitUsageError
}
id := f.Arg(0)
conf := args[0].(*boot.Config)
if k.pid != 0 && k.all {
Fatalf("it is invalid to specify both --all and --pid")
}
c, err := container.Load(conf.RootDir, id)
if err != nil {
Fatalf("error loading container: %v", err)
}
// The OCI command-line spec says that the signal should be specified
// via a flag, but runc (and things that call runc) pass it as an
// argument.
signal := f.Arg(1)
if signal == "" {
signal = "TERM"
}
sig, err := parseSignal(signal)
if err != nil {
Fatalf("%v", err)
}
if k.pid != 0 {
if err := c.SignalProcess(sig, int32(k.pid)); err != nil {
Fatalf("failed to signal pid %d: %v", k.pid, err)
}
} else {
if err := c.SignalContainer(sig, k.all); err != nil {
Fatalf("%v", err)
}
}
return subcommands.ExitSuccess
}
func parseSignal(s string) (syscall.Signal, error) {
n, err := strconv.Atoi(s)
if err == nil {
sig := syscall.Signal(n)
for _, msig := range signalMap {
if sig == msig {
return sig, nil
}
}
return -1, fmt.Errorf("unknown signal %q", s)
}
if sig, ok := signalMap[strings.TrimPrefix(strings.ToUpper(s), "SIG")]; ok {
return sig, nil
}
return -1, fmt.Errorf("unknown signal %q", s)
}
var signalMap = map[string]syscall.Signal{
"ABRT": unix.SIGABRT,
"ALRM": unix.SIGALRM,
"BUS": unix.SIGBUS,
"CHLD": unix.SIGCHLD,
"CLD": unix.SIGCLD,
"CONT": unix.SIGCONT,
"FPE": unix.SIGFPE,
"HUP": unix.SIGHUP,
"ILL": unix.SIGILL,
"INT": unix.SIGINT,
"IO": unix.SIGIO,
"IOT": unix.SIGIOT,
"KILL": unix.SIGKILL,
"PIPE": unix.SIGPIPE,
"POLL": unix.SIGPOLL,
"PROF": unix.SIGPROF,
"PWR": unix.SIGPWR,
"QUIT": unix.SIGQUIT,
"SEGV": unix.SIGSEGV,
"STKFLT": unix.SIGSTKFLT,
"STOP": unix.SIGSTOP,
"SYS": unix.SIGSYS,
"TERM": unix.SIGTERM,
"TRAP": unix.SIGTRAP,
"TSTP": unix.SIGTSTP,
"TTIN": unix.SIGTTIN,
"TTOU": unix.SIGTTOU,
"URG": unix.SIGURG,
"USR1": unix.SIGUSR1,
"USR2": unix.SIGUSR2,
"VTALRM": unix.SIGVTALRM,
"WINCH": unix.SIGWINCH,
"XCPU": unix.SIGXCPU,
"XFSZ": unix.SIGXFSZ,
}
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