gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/test/packetimpact/dut/runsc/devid.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build linux
    16  // +build linux
    17  
    18  // The devid binary is used to get the device ID in the runsc container.
    19  package main
    20  
    21  import (
    22  	"fmt"
    23  	"log"
    24  	"net"
    25  	"os"
    26  )
    27  
    28  func main() {
    29  	iface, err := net.InterfaceByName(os.Args[1])
    30  	if err != nil {
    31  		log.Fatalf("could not find link %s: %s", os.Args[1], err)
    32  	}
    33  	fmt.Printf("%d", iface.Index)
    34  }