mirror of https://github.com/docker/docs.git
41 lines
861 B
Go
41 lines
861 B
Go
package systemd
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import (
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"errors"
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"net"
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"strconv"
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"github.com/coreos/go-systemd/activation"
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)
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// ListenFD returns the specified socket activated files as a slice of
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// net.Listeners or all of the activated files if "*" is given.
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func ListenFD(addr string) ([]net.Listener, error) {
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// socket activation
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listeners, err := activation.Listeners(false)
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if err != nil {
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return nil, err
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}
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if listeners == nil || len(listeners) == 0 {
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return nil, errors.New("No sockets found")
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}
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// default to all fds just like unix:// and tcp://
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if addr == "" {
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addr = "*"
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}
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fdNum, _ := strconv.Atoi(addr)
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fdOffset := fdNum - 3
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if (addr != "*") && (len(listeners) < int(fdOffset)+1) {
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return nil, errors.New("Too few socket activated files passed in")
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}
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if addr == "*" {
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return listeners, nil
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}
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return []net.Listener{listeners[fdOffset]}, nil
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}
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