signal

Documentation

Index

• Constants
• func Alarm(seconds int)
• type Handler
  • func New() Handler
  • func NewAlarmHupUsr1() Handler

Examples

• Alarm

Constants

const (
	// MAXSIG is the largest number of non-realtime signals (on Linux).
	// 32..64 are realtime signals and irrelevant to us at this point.
	MAXSIG = 31
)

Functions

func Alarm

func Alarm(seconds int)

Alarm sets up a timer so a SIGALRM signal is fired after 'seconds' seconds.

Example

sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.Signal(syscall.SIGALRM))

Alarm(1)

t0 := time.Now().Unix()
fmt.Println("... do work here ...")

sig := <-sigs // wait for SIGALRM
fmt.Printf("Got '%s' after %ds\n", sig.String(), time.Now().Unix()-t0)

Output:

... do work here ...
Got 'alarm clock' after 1s

Types

type Handler

type Handler struct {
	Chan chan os.Signal
}

Handler is used to handle the handle INT, TERM and CHLD signals.

func New

func New() Handler

New initializes the signal handlers. We now get events for all signals. Read the Handler.Chan and handle them appropriately.

func NewAlarmHupUsr1

func NewAlarmHupUsr1() Handler

NewAlarmHupUsr1 initializes signal handlers for ALRM, HUP and USR1. Read the Handler.Chan and handle them appropriately.