github.com\fvbock\endless\endless.go:64:3: undefined: syscall.SIGUSR1

[Feng-xs]

github.com\fvbock\endless\endless.go:64:3: undefined: syscall.SIGUSR1
github.com\fvbock\endless\endless.go:65:3: undefined: syscall.SIGUSR2
github.com\fvbock\endless\endless.go:68:3: undefined: syscall.SIGTSTP
github.com\fvbock\endless\endless.go:111:5: undefined: syscall.SIGUSR1
github.com\fvbock\endless\endless.go:112:5: undefined: syscall.SIGUSR2
github.com\fvbock\endless\endless.go:115:5: undefined: syscall.SIGTSTP
github.com\fvbock\endless\endless.go:119:5: undefined: syscall.SIGUSR1
github.com\fvbock\endless\endless.go:120:5: undefined: syscall.SIGUSR2