56cf7be334
Somthing like 20605eb310f0b57bd06eea80ec63c5022fc83bde Docker-DCO-1.1-Signed-off-by: Brandon Philips <brandon.philips@coreos.com> (github: philips)
46 lines
1 KiB
Go
46 lines
1 KiB
Go
package systemd
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
|
|
"github.com/coreos/go-systemd/activation"
|
|
)
|
|
|
|
// ListenFD returns the specified socket activated files as a slice of
|
|
// net.Listeners or all of the activated files if "*" is given.
|
|
func ListenFD(addr string) ([]net.Listener, error) {
|
|
files := activation.Files(false)
|
|
if files == nil || len(files) == 0 {
|
|
return nil, errors.New("No sockets found")
|
|
}
|
|
|
|
// default to all fds just like unix:// and tcp://
|
|
if addr == "" {
|
|
addr = "*"
|
|
}
|
|
|
|
fdNum, _ := strconv.Atoi(addr)
|
|
fdOffset := fdNum - 3
|
|
if (addr != "*") && (len(files) < int(fdOffset)+1) {
|
|
return nil, errors.New("Too few socket activated files passed in")
|
|
}
|
|
|
|
// socket activation
|
|
listeners := make([]net.Listener, len(files))
|
|
for i, f := range files {
|
|
var err error
|
|
listeners[i], err = net.FileListener(f)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Error setting up FileListener for fd %d: %s", f.Fd(), err.Error())
|
|
}
|
|
}
|
|
|
|
if addr == "*" {
|
|
return listeners, nil
|
|
}
|
|
|
|
return []net.Listener{listeners[fdOffset]}, nil
|
|
}
|