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// Copyright 2015-2016 Luke Shumaker
package util
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
sd "lukeshu.com/git/go/libsystemd/sd_daemon"
)
var fdsLock sync.Mutex
var fds = map[int]*os.File{}
var sdFds = map[string]int{}
func init() {
fds[0] = os.Stdin
fds[1] = os.Stdout
fds[2] = os.Stderr
fromSd := sd.ListenFds(true)
if fromSd == nil {
return
}
for i, file := range fromSd {
fds[i+3] = file
sdFds[file.Name()] = i + 3
}
}
func FdNameToNum(name string) int {
switch name {
case "stdin":
return 0
case "stdout":
return 1
case "stderr":
return 2
case "systemd":
if len(sdFds) == 0 {
return -1
}
return 3
default:
if n, err := strconv.Atoi(name); err == nil {
if n >= 0 {
return n
}
} else if strings.HasPrefix(name, "systemd:") {
name = strings.TrimPrefix(name, "systemd")
n, ok := sdFds[name]
if ok {
return n
} else if n, err := strconv.Atoi(name); err == nil && n < len(sdFds) {
return n + 3
}
}
return -1
}
}
func FdFile(fd int) *os.File {
fdsLock.Lock()
defer fdsLock.Unlock()
file, ok := fds[fd]
if ok {
return file
}
file = os.NewFile(uintptr(fd), fmt.Sprintf("/dev/fd/%d", fd))
fds[fd] = file
return file
}
func StreamListener(stype, saddr string) (net.Listener, error) {
switch stype {
case "fd":
return net.FileListener(FdFile(FdNameToNum(saddr)))
default: /* case "tcp", "tcp4", "tcp6", "unix", "unixpacket": */
return net.Listen(stype, saddr)
}
}
func PacketListener(stype, saddr string) (net.PacketConn, error) {
switch stype {
case "fd":
return net.FilePacketConn(FdFile(FdNameToNum(saddr)))
default: /* case "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unixgram": */
return net.ListenPacket(stype, saddr)
}
}
// For completeless, I might want to implement methods for each of
// these:
// - FIFO
// - Special
// - Netlink
// - MessageQueue
// - USBFunction
|
