1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
package listenfd
import (
"net"
"os"
"strconv"
"github.com/pkg/errors"
)
const fdStart = 3
func GetListener(i uint64) (net.Listener, error) {
lfds, present := os.LookupEnv("LISTEN_FDS")
if !present {
return nil, nil
}
fds, err := strconv.ParseUint(lfds, 10, 32)
if err != nil {
return nil, errors.Wrap(err, "could not parse LISTEN_FDS")
}
if i >= fds {
return nil, errors.Errorf("only %d fds available, requested index %d", fds, i)
}
l, err := net.FileListener(os.NewFile(uintptr(i+fdStart), ""))
if err != nil {
return nil, errors.Wrap(err, "could not create listener")
}
return l, nil
}
|