go - 拨 unixgram : no such file or directory error

Question

我编写了一个与 wpa_supplicant 对话的小型库。我已经验证它适用于测试应用程序，但我也想添加一个单元测试。我的单元测试无法连接到 unix 套接字。我收到错误“没有这样的文件或目录”，但两个套接字文件都已创建。

lib.go

package libwpa

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "net"
    "os"
    "strconv"
    "strings"
)

type Conn struct {
    uconn     *net.UnixConn //Linux specific
    localSock *os.File
}

func Connect(usock string) (*Conn, error) {
    var (
        uc  *Conn
        err error
    )
    uc = &Conn{}

    if uc.localSock, err = ioutil.TempFile("/tmp", "wpa_supplicant"); err != nil {
        return uc, err
    }
    os.Remove(uc.localSock.Name())

    uc.uconn, err = net.DialUnix("unixgram",
        &net.UnixAddr{Name: uc.localSock.Name(), Net: "unixgram"},
        &net.UnixAddr{Name: usock, Net: "unixgram"})
    if err != nil {
        return uc, err
    }

    return uc, nil
}

lib_test.go

package libwpa

import (
    "fmt"
    "io/ioutil"
    "net"
    "os"
    "testing"
)

func listen(reply chan<- []byte) {
    conn, err := net.ListenUnixgram("unixgram", &net.UnixAddr{Name: "/tmp/foobar", Net: "unixgram"})
    if err != nil {
        fmt.Printf("failed to listen: %v\n", err)
        panic(err)
    }
    defer os.Remove("/tmp/foobar")

    f, _ := ioutil.ReadDir("/tmp")
    for _, d := range f {
        fmt.Printf("%v\n", d.Name())
    }

    buf := make([]byte, 2048)
    n, uaddr, err := conn.ReadFromUnix(buf)
    if err != nil {
        fmt.Printf("LISTEN: Error: %v\n", err)
    } else {
        fmt.Printf("LISTEN: received %v bytes from %+v\n", n, uaddr)
        fmt.Printf("LISTEN: %v\n", string(buf))
    }

    conn.Close()
    reply <- buf
}

func Test_Connect(t *testing.T) {
    reply := make(chan []byte, 2)
    go listen(reply)
    _, err := Connect("/tmp/foobar")
    if err != nil {
        t.Fatalf("Failed to connect: %v", err)
    }
}

运行得到

$ go test                                                                                                                                                                                                                                                    
--- FAIL: Test_Connect (0.00s)
        lib_test.go:42: Failed to connect: dial unixgram /tmp/wpa_supplicant208023735->/tmp/foobar: connect: no such file or directory
FAIL
exit status 1
FAIL    _/home/code/apps/go/src/crown/libwpa 0.006s

$ ls /tmp/{foobar,wpa*}                                                                                                                                                                                                                                        
/tmp/foobar=  /tmp/wpa_supplicant923064975=

Answer 1

我想你之前忘了加上“defer”关键字:

os.Remove(uc.localSock.Name())

在你的 lib.go 文件中。修复后，您将收到“地址已在使用”错误。