From 85b7374491e842c44bec3ce5ec800794cae10295 Mon Sep 17 00:00:00 2001 From: Valentin Rothberg Date: Wed, 12 Feb 2020 11:10:55 +0100 Subject: 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 --- .../github.com/docker/docker/pkg/signal/README.md | 1 - .../github.com/docker/docker/pkg/signal/signal.go | 54 ----------- .../docker/docker/pkg/signal/signal_darwin.go | 41 -------- .../docker/docker/pkg/signal/signal_freebsd.go | 43 --------- .../docker/docker/pkg/signal/signal_linux.go | 83 ---------------- .../docker/docker/pkg/signal/signal_linux_mipsx.go | 84 ----------------- .../docker/docker/pkg/signal/signal_unix.go | 21 ----- .../docker/docker/pkg/signal/signal_unsupported.go | 10 -- .../docker/docker/pkg/signal/signal_windows.go | 26 ------ vendor/github.com/docker/docker/pkg/signal/trap.go | 104 --------------------- 10 files changed, 467 deletions(-) delete mode 100644 vendor/github.com/docker/docker/pkg/signal/README.md delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_darwin.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_linux.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_unix.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/signal_windows.go delete mode 100644 vendor/github.com/docker/docker/pkg/signal/trap.go (limited to 'vendor/github.com') 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 -} -- cgit v1.2.3-54-g00ecf