mirror of
https://github.com/opencontainers/runc.git
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627054d246
This silences all of the "should have a package comment" lint warnings from golangci-lint. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
114 lines
2.3 KiB
Go
114 lines
2.3 KiB
Go
// pidfd-kill is a command-line tool to send signals to processes using pidfds
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// passed through a unix socket.
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//
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// This tool is only intended to be used within runc's integration tests.
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package main
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import (
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"errors"
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"fmt"
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"net"
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"os"
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"os/signal"
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"github.com/urfave/cli"
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"golang.org/x/sys/unix"
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"github.com/opencontainers/runc/libcontainer/utils"
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)
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const (
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usage = `Open Container Initiative tests/cmd/pidfd-kill
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pidfd-kill is an implementation of a consumer of runC's --pidfd-socket API.
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After received SIGTERM, pidfd-kill sends the given signal to init process by
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pidfd received from --pidfd-socket.
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To use pidfd-kill, just specify a socket path at which you want to receive
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pidfd:
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$ pidfd-kill [--signal KILL] socket.sock
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`
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)
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func main() {
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app := cli.NewApp()
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app.Name = "pidfd-kill"
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app.Usage = usage
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "signal",
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Value: "SIGKILL",
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Usage: "Signal to send to the init process",
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},
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cli.StringFlag{
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Name: "pid-file",
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Value: "",
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Usage: "Path to write the pidfd-kill process ID to",
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},
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}
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app.Action = func(ctx *cli.Context) error {
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args := ctx.Args()
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if len(args) != 1 {
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return errors.New("required a single socket path")
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}
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socketFile := ctx.Args()[0]
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pidFile := ctx.String("pid-file")
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if pidFile != "" {
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pid := fmt.Sprintf("%d\n", os.Getpid())
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if err := os.WriteFile(pidFile, []byte(pid), 0o644); err != nil {
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return err
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}
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defer os.Remove(pidFile)
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}
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sigStr := ctx.String("signal")
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if sigStr == "" {
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sigStr = "SIGKILL"
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}
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sig := unix.SignalNum(sigStr)
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pidfdFile, err := recvPidfd(socketFile)
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if err != nil {
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return err
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}
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defer pidfdFile.Close()
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signalCh := make(chan os.Signal, 16)
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signal.Notify(signalCh, unix.SIGTERM)
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<-signalCh
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return unix.PidfdSendSignal(int(pidfdFile.Fd()), sig, nil, 0)
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}
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if err := app.Run(os.Args); err != nil {
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fmt.Fprintln(os.Stderr, "fatal error:", err)
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os.Exit(1)
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}
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}
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func recvPidfd(socketFile string) (*os.File, error) {
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ln, err := net.Listen("unix", socketFile)
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if err != nil {
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return nil, err
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}
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defer ln.Close()
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conn, err := ln.Accept()
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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socket, err := conn.(*net.UnixConn).File()
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if err != nil {
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return nil, err
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}
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defer socket.Close()
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return utils.RecvFile(socket)
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}
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