replace zxq.co/ripple/hanayo

vendor/github.com/rcrowley/goagain/legacy.go

@@ -0,0 +1,32 @@
+package goagain
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+)
+
+// Block this goroutine awaiting signals.  Signals are handled as they
+// are by Nginx and Unicorn: <http://unicorn.bogomips.org/SIGNALS.html>.
+func AwaitSignals(l net.Listener) (err error) {
+	_, err = Wait(l)
+	return
+}
+
+// Convert and validate the GOAGAIN_FD, GOAGAIN_NAME, and GOAGAIN_PPID
+// environment variables.  If all three are present and in order, this
+// is a child process that may pick up where the parent left off.
+func GetEnvs() (l net.Listener, ppid int, err error) {
+	if _, err = fmt.Sscan(os.Getenv("GOAGAIN_PPID"), &ppid); nil != err {
+		return
+	}
+	l, err = Listener()
+	return
+}
+
+// Send SIGQUIT to the given ppid in order to complete the handoff to the
+// child process.
+func KillParent(ppid int) error {
+	return syscall.Kill(ppid, syscall.SIGQUIT)
+}