func (p *Pinger) recvICMP(conn *icmp.PacketConn, recv chan<- *packet, ctx *context, wg *sync.WaitGroup) {
p.debugln("recvICMP(): Start")
for {
select {
case <-ctx.stop:
p.debugln("recvICMP(): <-ctx.stop")
wg.Done()
p.debugln("recvICMP(): wg.Done()")
return
default:
}
bytes := make([]byte, 512)
conn.SetReadDeadline(time.Now().Add(time.Millisecond * 100))
p.debugln("recvICMP(): ReadFrom Start")
_, ra, err := conn.ReadFrom(bytes)
p.debugln("recvICMP(): ReadFrom End")
if err != nil {
if neterr, ok := err.(*net.OpError); ok {
if neterr.Timeout() {
p.debugln("recvICMP(): Read Timeout")
continue
} else {
p.debugln("recvICMP(): OpError happen", err)
p.mu.Lock()
ctx.err = err
p.mu.Unlock()
p.debugln("recvICMP(): close(ctx.done)")
close(ctx.done)
p.debugln("recvICMP(): wg.Done()")
wg.Done()
return
}
}
}
p.debugln("recvICMP(): p.recv <- packet")
select {
case recv <- &packet{bytes: bytes, addr: ra}:
case <-ctx.stop:
p.debugln("recvICMP(): <-ctx.stop")
wg.Done()
p.debugln("recvICMP(): wg.Done()")
return
}
}
}
