mirror of
https://github.com/containers/podman.git
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9536560b4f
add core container commands for podmanv2: kill, pause, restart, rm, stop, unpause Signed-off-by: Brent Baude <bbaude@redhat.com>
143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
// +build linux
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// Signal handling for Linux only.
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package signal
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// Copyright 2013-2018 Docker, Inc.
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// NOTE: this package has originally been copied from github.com/docker/docker.
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import (
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"fmt"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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"golang.org/x/sys/unix"
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)
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const (
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sigrtmin = 34
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sigrtmax = 64
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SIGWINCH = syscall.SIGWINCH // For cross-compilation with Windows
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)
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// signalMap is a map of Linux signals.
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var signalMap = map[string]syscall.Signal{
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"ABRT": unix.SIGABRT,
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"ALRM": unix.SIGALRM,
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"BUS": unix.SIGBUS,
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"CHLD": unix.SIGCHLD,
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"CLD": unix.SIGCLD,
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"CONT": unix.SIGCONT,
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"FPE": unix.SIGFPE,
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"HUP": unix.SIGHUP,
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"ILL": unix.SIGILL,
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"INT": unix.SIGINT,
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"IO": unix.SIGIO,
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"IOT": unix.SIGIOT,
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"KILL": unix.SIGKILL,
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"PIPE": unix.SIGPIPE,
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"POLL": unix.SIGPOLL,
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"PROF": unix.SIGPROF,
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"PWR": unix.SIGPWR,
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"QUIT": unix.SIGQUIT,
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"SEGV": unix.SIGSEGV,
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"STKFLT": unix.SIGSTKFLT,
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"STOP": unix.SIGSTOP,
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"SYS": unix.SIGSYS,
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"TERM": unix.SIGTERM,
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"TRAP": unix.SIGTRAP,
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"TSTP": unix.SIGTSTP,
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"TTIN": unix.SIGTTIN,
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"TTOU": unix.SIGTTOU,
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"URG": unix.SIGURG,
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"USR1": unix.SIGUSR1,
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"USR2": unix.SIGUSR2,
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"VTALRM": unix.SIGVTALRM,
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"WINCH": unix.SIGWINCH,
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"XCPU": unix.SIGXCPU,
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"XFSZ": unix.SIGXFSZ,
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"RTMIN": sigrtmin,
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"RTMIN+1": sigrtmin + 1,
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"RTMIN+2": sigrtmin + 2,
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"RTMIN+3": sigrtmin + 3,
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"RTMIN+4": sigrtmin + 4,
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"RTMIN+5": sigrtmin + 5,
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"RTMIN+6": sigrtmin + 6,
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"RTMIN+7": sigrtmin + 7,
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"RTMIN+8": sigrtmin + 8,
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"RTMIN+9": sigrtmin + 9,
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"RTMIN+10": sigrtmin + 10,
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"RTMIN+11": sigrtmin + 11,
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"RTMIN+12": sigrtmin + 12,
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"RTMIN+13": sigrtmin + 13,
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"RTMIN+14": sigrtmin + 14,
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"RTMIN+15": sigrtmin + 15,
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"RTMAX-14": sigrtmax - 14,
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"RTMAX-13": sigrtmax - 13,
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"RTMAX-12": sigrtmax - 12,
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"RTMAX-11": sigrtmax - 11,
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"RTMAX-10": sigrtmax - 10,
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"RTMAX-9": sigrtmax - 9,
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"RTMAX-8": sigrtmax - 8,
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"RTMAX-7": sigrtmax - 7,
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"RTMAX-6": sigrtmax - 6,
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"RTMAX-5": sigrtmax - 5,
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"RTMAX-4": sigrtmax - 4,
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"RTMAX-3": sigrtmax - 3,
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"RTMAX-2": sigrtmax - 2,
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"RTMAX-1": sigrtmax - 1,
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"RTMAX": sigrtmax,
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}
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// ParseSignal translates a string to a valid syscall signal.
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// It returns an error if the signal map doesn't include the given signal.
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func ParseSignal(rawSignal string) (syscall.Signal, error) {
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s, err := strconv.Atoi(rawSignal)
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if err == nil {
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if s == 0 {
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return -1, fmt.Errorf("invalid signal: %s", rawSignal)
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}
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return syscall.Signal(s), nil
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}
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sig, ok := signalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
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if !ok {
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return -1, fmt.Errorf("invalid signal: %s", rawSignal)
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}
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return sig, nil
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}
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// CatchAll catches all signals and relays them to the specified channel.
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func CatchAll(sigc chan os.Signal) {
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var handledSigs []os.Signal
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for _, s := range signalMap {
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handledSigs = append(handledSigs, s)
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}
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signal.Notify(sigc, handledSigs...)
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}
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// StopCatch stops catching the signals and closes the specified channel.
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func StopCatch(sigc chan os.Signal) {
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signal.Stop(sigc)
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close(sigc)
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}
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// ParseSignalNameOrNumber translates a string to a valid syscall signal. Input
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// can be a name or number representation i.e. "KILL" "9"
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func ParseSignalNameOrNumber(rawSignal string) (syscall.Signal, error) {
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s, err := ParseSignal(rawSignal)
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if err == nil {
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return s, nil
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}
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for k, v := range signalMap {
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if k == strings.ToUpper(rawSignal) {
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return v, nil
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}
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}
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return -1, fmt.Errorf("invalid signal: %s", rawSignal)
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}
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