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// +build !windows
package varlink
import (
"net"
"os"
"strconv"
"strings"
"syscall"
)
func activationListener() net.Listener {
pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
if err != nil || pid != os.Getpid() {
return nil
}
nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
if err != nil || nfds < 1 {
return nil
}
fd := -1
// If more than one file descriptor is passed, find the
// "varlink" tag. The first file descriptor is always 3.
if nfds > 1 {
fdnames, set := os.LookupEnv("LISTEN_FDNAMES")
if !set {
return nil
}
names := strings.Split(fdnames, ":")
if len(names) != nfds {
return nil
}
for i, name := range names {
if name == "varlink" {
fd = 3 + i
break
}
}
if fd < 0 {
return nil
}
} else {
fd = 3
}
syscall.CloseOnExec(fd)
file := os.NewFile(uintptr(fd), "varlink")
listener, err := net.FileListener(file)
if err != nil {
return nil
}
return listener
}
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