add pkg/signal

Add pkg/signal to deal with parts of signal processing and translating
signals from string to numeric representations.  The code has been
copied from docker/docker (and attributed with the copyright) but been
reduced to only what libpod needs (on Linux).

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

10 files changed, 0 insertions, 467 deletions

diff --git a/vendor/github.com/docker/docker/pkg/signal/README.md b/vendor/github.com/docker/docker/pkg/signal/README.md
deleted file mode 100644
index 2b237a594..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/README.md
+++ /dev/null
@@ -1 +0,0 @@
-This package provides helper functions for dealing with signals across various operating systems
\ No newline at end of file
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal.go b/vendor/github.com/docker/docker/pkg/signal/signal.go
deleted file mode 100644
index 88ef7b5ea..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Package signal provides helper functions for dealing with signals across
-// various operating systems.
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"fmt"
-	"os"
-	"os/signal"
-	"strconv"
-	"strings"
-	"syscall"
-)
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	var handledSigs []os.Signal
-	for _, s := range SignalMap {
-		handledSigs = append(handledSigs, s)
-	}
-	signal.Notify(sigc, handledSigs...)
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	signal.Stop(sigc)
-	close(sigc)
-}
-
-// ParseSignal translates a string to a valid syscall signal.
-// It returns an error if the signal map doesn't include the given signal.
-func ParseSignal(rawSignal string) (syscall.Signal, error) {
-	s, err := strconv.Atoi(rawSignal)
-	if err == nil {
-		if s == 0 {
-			return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
-		}
-		return syscall.Signal(s), nil
-	}
-	signal, ok := SignalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
-	if !ok {
-		return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
-	}
-	return signal, nil
-}
-
-// ValidSignalForPlatform returns true if a signal is valid on the platform
-func ValidSignalForPlatform(sig syscall.Signal) bool {
-	for _, v := range SignalMap {
-		if v == sig {
-			return true
-		}
-	}
-	return false
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go b/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go
deleted file mode 100644
index ee5501e3d..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is a map of Darwin signals.
-var SignalMap = map[string]syscall.Signal{
-	"ABRT":   syscall.SIGABRT,
-	"ALRM":   syscall.SIGALRM,
-	"BUG":    syscall.SIGBUS,
-	"CHLD":   syscall.SIGCHLD,
-	"CONT":   syscall.SIGCONT,
-	"EMT":    syscall.SIGEMT,
-	"FPE":    syscall.SIGFPE,
-	"HUP":    syscall.SIGHUP,
-	"ILL":    syscall.SIGILL,
-	"INFO":   syscall.SIGINFO,
-	"INT":    syscall.SIGINT,
-	"IO":     syscall.SIGIO,
-	"IOT":    syscall.SIGIOT,
-	"KILL":   syscall.SIGKILL,
-	"PIPE":   syscall.SIGPIPE,
-	"PROF":   syscall.SIGPROF,
-	"QUIT":   syscall.SIGQUIT,
-	"SEGV":   syscall.SIGSEGV,
-	"STOP":   syscall.SIGSTOP,
-	"SYS":    syscall.SIGSYS,
-	"TERM":   syscall.SIGTERM,
-	"TRAP":   syscall.SIGTRAP,
-	"TSTP":   syscall.SIGTSTP,
-	"TTIN":   syscall.SIGTTIN,
-	"TTOU":   syscall.SIGTTOU,
-	"URG":    syscall.SIGURG,
-	"USR1":   syscall.SIGUSR1,
-	"USR2":   syscall.SIGUSR2,
-	"VTALRM": syscall.SIGVTALRM,
-	"WINCH":  syscall.SIGWINCH,
-	"XCPU":   syscall.SIGXCPU,
-	"XFSZ":   syscall.SIGXFSZ,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go b/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go
deleted file mode 100644
index 764f90e26..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is a map of FreeBSD signals.
-var SignalMap = map[string]syscall.Signal{
-	"ABRT":   syscall.SIGABRT,
-	"ALRM":   syscall.SIGALRM,
-	"BUF":    syscall.SIGBUS,
-	"CHLD":   syscall.SIGCHLD,
-	"CONT":   syscall.SIGCONT,
-	"EMT":    syscall.SIGEMT,
-	"FPE":    syscall.SIGFPE,
-	"HUP":    syscall.SIGHUP,
-	"ILL":    syscall.SIGILL,
-	"INFO":   syscall.SIGINFO,
-	"INT":    syscall.SIGINT,
-	"IO":     syscall.SIGIO,
-	"IOT":    syscall.SIGIOT,
-	"KILL":   syscall.SIGKILL,
-	"LWP":    syscall.SIGLWP,
-	"PIPE":   syscall.SIGPIPE,
-	"PROF":   syscall.SIGPROF,
-	"QUIT":   syscall.SIGQUIT,
-	"SEGV":   syscall.SIGSEGV,
-	"STOP":   syscall.SIGSTOP,
-	"SYS":    syscall.SIGSYS,
-	"TERM":   syscall.SIGTERM,
-	"THR":    syscall.SIGTHR,
-	"TRAP":   syscall.SIGTRAP,
-	"TSTP":   syscall.SIGTSTP,
-	"TTIN":   syscall.SIGTTIN,
-	"TTOU":   syscall.SIGTTOU,
-	"URG":    syscall.SIGURG,
-	"USR1":   syscall.SIGUSR1,
-	"USR2":   syscall.SIGUSR2,
-	"VTALRM": syscall.SIGVTALRM,
-	"WINCH":  syscall.SIGWINCH,
-	"XCPU":   syscall.SIGXCPU,
-	"XFSZ":   syscall.SIGXFSZ,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_linux.go b/vendor/github.com/docker/docker/pkg/signal/signal_linux.go
deleted file mode 100644
index 4013bded1..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_linux.go
+++ /dev/null
@@ -1,83 +0,0 @@
-// +build !mips,!mipsle,!mips64,!mips64le
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-const (
-	sigrtmin = 34
-	sigrtmax = 64
-)
-
-// SignalMap is a map of Linux signals.
-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,
-	"RTMIN":    sigrtmin,
-	"RTMIN+1":  sigrtmin + 1,
-	"RTMIN+2":  sigrtmin + 2,
-	"RTMIN+3":  sigrtmin + 3,
-	"RTMIN+4":  sigrtmin + 4,
-	"RTMIN+5":  sigrtmin + 5,
-	"RTMIN+6":  sigrtmin + 6,
-	"RTMIN+7":  sigrtmin + 7,
-	"RTMIN+8":  sigrtmin + 8,
-	"RTMIN+9":  sigrtmin + 9,
-	"RTMIN+10": sigrtmin + 10,
-	"RTMIN+11": sigrtmin + 11,
-	"RTMIN+12": sigrtmin + 12,
-	"RTMIN+13": sigrtmin + 13,
-	"RTMIN+14": sigrtmin + 14,
-	"RTMIN+15": sigrtmin + 15,
-	"RTMAX-14": sigrtmax - 14,
-	"RTMAX-13": sigrtmax - 13,
-	"RTMAX-12": sigrtmax - 12,
-	"RTMAX-11": sigrtmax - 11,
-	"RTMAX-10": sigrtmax - 10,
-	"RTMAX-9":  sigrtmax - 9,
-	"RTMAX-8":  sigrtmax - 8,
-	"RTMAX-7":  sigrtmax - 7,
-	"RTMAX-6":  sigrtmax - 6,
-	"RTMAX-5":  sigrtmax - 5,
-	"RTMAX-4":  sigrtmax - 4,
-	"RTMAX-3":  sigrtmax - 3,
-	"RTMAX-2":  sigrtmax - 2,
-	"RTMAX-1":  sigrtmax - 1,
-	"RTMAX":    sigrtmax,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go b/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go
deleted file mode 100644
index 4c7989121..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go
+++ /dev/null
@@ -1,84 +0,0 @@
-// +build linux
-// +build mips mipsle mips64 mips64le
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-const (
-	sigrtmin = 34
-	sigrtmax = 127
-)
-
-// SignalMap is a map of Linux signals.
-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,
-	"SIGEMT":   unix.SIGEMT,
-	"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,
-	"RTMIN":    sigrtmin,
-	"RTMIN+1":  sigrtmin + 1,
-	"RTMIN+2":  sigrtmin + 2,
-	"RTMIN+3":  sigrtmin + 3,
-	"RTMIN+4":  sigrtmin + 4,
-	"RTMIN+5":  sigrtmin + 5,
-	"RTMIN+6":  sigrtmin + 6,
-	"RTMIN+7":  sigrtmin + 7,
-	"RTMIN+8":  sigrtmin + 8,
-	"RTMIN+9":  sigrtmin + 9,
-	"RTMIN+10": sigrtmin + 10,
-	"RTMIN+11": sigrtmin + 11,
-	"RTMIN+12": sigrtmin + 12,
-	"RTMIN+13": sigrtmin + 13,
-	"RTMIN+14": sigrtmin + 14,
-	"RTMIN+15": sigrtmin + 15,
-	"RTMAX-14": sigrtmax - 14,
-	"RTMAX-13": sigrtmax - 13,
-	"RTMAX-12": sigrtmax - 12,
-	"RTMAX-11": sigrtmax - 11,
-	"RTMAX-10": sigrtmax - 10,
-	"RTMAX-9":  sigrtmax - 9,
-	"RTMAX-8":  sigrtmax - 8,
-	"RTMAX-7":  sigrtmax - 7,
-	"RTMAX-6":  sigrtmax - 6,
-	"RTMAX-5":  sigrtmax - 5,
-	"RTMAX-4":  sigrtmax - 4,
-	"RTMAX-3":  sigrtmax - 3,
-	"RTMAX-2":  sigrtmax - 2,
-	"RTMAX-1":  sigrtmax - 1,
-	"RTMAX":    sigrtmax,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_unix.go b/vendor/github.com/docker/docker/pkg/signal/signal_unix.go
deleted file mode 100644
index a2aa4248f..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_unix.go
+++ /dev/null
@@ -1,21 +0,0 @@
-// +build !windows
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// Signals used in cli/command (no windows equivalent, use
-// invalid signals so they don't get handled)
-
-const (
-	// SIGCHLD is a signal sent to a process when a child process terminates, is interrupted, or resumes after being interrupted.
-	SIGCHLD = syscall.SIGCHLD
-	// SIGWINCH is a signal sent to a process when its controlling terminal changes its size
-	SIGWINCH = syscall.SIGWINCH
-	// SIGPIPE is a signal sent to a process when a pipe is written to before the other end is open for reading
-	SIGPIPE = syscall.SIGPIPE
-	// DefaultStopSignal is the syscall signal used to stop a container in unix systems.
-	DefaultStopSignal = "SIGTERM"
-)
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go b/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go
deleted file mode 100644
index 1fd25a83c..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// +build !linux,!darwin,!freebsd,!windows
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is an empty map of signals for unsupported platform.
-var SignalMap = map[string]syscall.Signal{}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_windows.go b/vendor/github.com/docker/docker/pkg/signal/signal_windows.go
deleted file mode 100644
index 65752f24a..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_windows.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// Signals used in cli/command (no windows equivalent, use
-// invalid signals so they don't get handled)
-const (
-	SIGCHLD  = syscall.Signal(0xff)
-	SIGWINCH = syscall.Signal(0xff)
-	SIGPIPE  = syscall.Signal(0xff)
-	// DefaultStopSignal is the syscall signal used to stop a container in windows systems.
-	DefaultStopSignal = "15"
-)
-
-// SignalMap is a map of "supported" signals. As per the comment in GOLang's
-// ztypes_windows.go: "More invented values for signals". Windows doesn't
-// really support signals in any way, shape or form that Unix does.
-//
-// We have these so that docker kill can be used to gracefully (TERM) and
-// forcibly (KILL) terminate a container on Windows.
-var SignalMap = map[string]syscall.Signal{
-	"KILL": syscall.SIGKILL,
-	"TERM": syscall.SIGTERM,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/trap.go b/vendor/github.com/docker/docker/pkg/signal/trap.go
deleted file mode 100644
index a277b9562..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/trap.go
+++ /dev/null
@@ -1,104 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"fmt"
-	"os"
-	gosignal "os/signal"
-	"path/filepath"
-	"runtime"
-	"strings"
-	"sync/atomic"
-	"syscall"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-// Trap sets up a simplified signal "trap", appropriate for common
-// behavior expected from a vanilla unix command-line tool in general
-// (and the Docker engine in particular).
-//
-// * If SIGINT or SIGTERM are received, `cleanup` is called, then the process is terminated.
-// * If SIGINT or SIGTERM are received 3 times before cleanup is complete, then cleanup is
-//   skipped and the process is terminated immediately (allows force quit of stuck daemon)
-// * A SIGQUIT always causes an exit without cleanup, with a goroutine dump preceding exit.
-// * Ignore SIGPIPE events. These are generated by systemd when journald is restarted while
-//   the docker daemon is not restarted and also running under systemd.
-//   Fixes https://github.com/docker/docker/issues/19728
-//
-func Trap(cleanup func(), logger interface {
-	Info(args ...interface{})
-}) {
-	c := make(chan os.Signal, 1)
-	// we will handle INT, TERM, QUIT, SIGPIPE here
-	signals := []os.Signal{os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT, syscall.SIGPIPE}
-	gosignal.Notify(c, signals...)
-	go func() {
-		interruptCount := uint32(0)
-		for sig := range c {
-			if sig == syscall.SIGPIPE {
-				continue
-			}
-
-			go func(sig os.Signal) {
-				logger.Info(fmt.Sprintf("Processing signal '%v'", sig))
-				switch sig {
-				case os.Interrupt, syscall.SIGTERM:
-					if atomic.LoadUint32(&interruptCount) < 3 {
-						// Initiate the cleanup only once
-						if atomic.AddUint32(&interruptCount, 1) == 1 {
-							// Call the provided cleanup handler
-							cleanup()
-							os.Exit(0)
-						} else {
-							return
-						}
-					} else {
-						// 3 SIGTERM/INT signals received; force exit without cleanup
-						logger.Info("Forcing docker daemon shutdown without cleanup; 3 interrupts received")
-					}
-				case syscall.SIGQUIT:
-					DumpStacks("")
-					logger.Info("Forcing docker daemon shutdown without cleanup on SIGQUIT")
-				}
-				// for the SIGINT/TERM, and SIGQUIT non-clean shutdown case, exit with 128 + signal #
-				os.Exit(128 + int(sig.(syscall.Signal)))
-			}(sig)
-		}
-	}()
-}
-
-const stacksLogNameTemplate = "goroutine-stacks-%s.log"
-
-// DumpStacks appends the runtime stack into file in dir and returns full path
-// to that file.
-func DumpStacks(dir string) (string, error) {
-	var (
-		buf       []byte
-		stackSize int
-	)
-	bufferLen := 16384
-	for stackSize == len(buf) {
-		buf = make([]byte, bufferLen)
-		stackSize = runtime.Stack(buf, true)
-		bufferLen *= 2
-	}
-	buf = buf[:stackSize]
-	var f *os.File
-	if dir != "" {
-		path := filepath.Join(dir, fmt.Sprintf(stacksLogNameTemplate, strings.Replace(time.Now().Format(time.RFC3339), ":", "", -1)))
-		var err error
-		f, err = os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0666)
-		if err != nil {
-			return "", errors.Wrap(err, "failed to open file to write the goroutine stacks")
-		}
-		defer f.Close()
-		defer f.Sync()
-	} else {
-		f = os.Stderr
-	}
-	if _, err := f.Write(buf); err != nil {
-		return "", errors.Wrap(err, "failed to write goroutine stacks")
-	}
-	return f.Name(), nil
-}