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Published: Aug 14, 2019 License: Apache-2.0 Imports: 12 Imported by: 1


This package provides helper functions for dealing with signals across various operating systems



Package signal provides helper functions for dealing with signals across various operating systems.



View Source
const (
	// SIGCHLD is a signal sent to a process when a child process terminates, is interrupted, or resumes after being interrupted.
	// SIGWINCH is a signal sent to a process when its controlling terminal changes its size
	// SIGPIPE is a signal sent to a process when a pipe is written to before the other end is open for reading
	// DefaultStopSignal is the syscall signal used to stop a container in unix systems.
	DefaultStopSignal = "SIGTERM"


View Source
var SignalMap = map[string]syscall.Signal{
	"ABRT":     syscall.SIGABRT,
	"ALRM":     syscall.SIGALRM,
	"BUS":      syscall.SIGBUS,
	"CHLD":     syscall.SIGCHLD,
	"CLD":      syscall.SIGCLD,
	"CONT":     syscall.SIGCONT,
	"FPE":      syscall.SIGFPE,
	"HUP":      syscall.SIGHUP,
	"ILL":      syscall.SIGILL,
	"INT":      syscall.SIGINT,
	"IO":       syscall.SIGIO,
	"IOT":      syscall.SIGIOT,
	"KILL":     syscall.SIGKILL,
	"PIPE":     syscall.SIGPIPE,
	"POLL":     syscall.SIGPOLL,
	"PROF":     syscall.SIGPROF,
	"PWR":      syscall.SIGPWR,
	"QUIT":     syscall.SIGQUIT,
	"SEGV":     syscall.SIGSEGV,
	"STKFLT":   syscall.SIGSTKFLT,
	"STOP":     syscall.SIGSTOP,
	"SYS":      syscall.SIGSYS,
	"TERM":     syscall.SIGTERM,
	"TRAP":     syscall.SIGTRAP,
	"TSTP":     syscall.SIGTSTP,
	"TTIN":     syscall.SIGTTIN,
	"TTOU":     syscall.SIGTTOU,
	"UNUSED":   syscall.SIGUNUSED,
	"URG":      syscall.SIGURG,
	"USR1":     syscall.SIGUSR1,
	"USR2":     syscall.SIGUSR2,
	"VTALRM":   syscall.SIGVTALRM,
	"WINCH":    syscall.SIGWINCH,
	"XCPU":     syscall.SIGXCPU,
	"XFSZ":     syscall.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,

SignalMap is a map of Linux signals.


func CatchAll

func CatchAll(sigc chan os.Signal)

CatchAll catches all signals and relays them to the specified channel.

func DumpStacks

func DumpStacks(dir string) (string, error)

DumpStacks appends the runtime stack into file in dir and returns full path to that file.

func ParseSignal

func ParseSignal(rawSignal string) (syscall.Signal, error)

ParseSignal translates a string to a valid syscall signal. It returns an error if the signal map doesn't include the given signal.

func StopCatch

func StopCatch(sigc chan os.Signal)

StopCatch stops catching the signals and closes the specified channel.

func Trap

func Trap(cleanup func())

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.

func ValidSignalForPlatform

func ValidSignalForPlatform(sig syscall.Signal) bool

ValidSignalForPlatform returns true if a signal is valid on the platform


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