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reuseport_posix.go
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/
reuseport_posix.go
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//go:build !plan9
package reuseport
import (
"net"
"syscall"
)
// reuseErrShouldRetry diagnoses whether to retry after a reuse error.
// if we failed to bind, we should retry. if bind worked and this is a
// real dial error (remote end didnt answer) then we should not retry.
func reuseErrShouldRetry(err error) bool {
if err == nil {
return false // hey, it worked! no need to retry.
}
// if it's a network timeout error, it's a legitimate failure.
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
return false
}
errno, ok := err.(syscall.Errno)
if !ok { // not an errno? who knows what this is. retry.
return true
}
switch errno {
case syscall.EADDRINUSE, syscall.EADDRNOTAVAIL:
return true // failure to bind. retry.
case syscall.ECONNREFUSED:
return false // real dial error
default:
return true // optimistically default to retry.
}
}