[问题] go 调用 Linux 系统接口无法关闭 fd

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这是一个创建于 1530 天前的主题，其中的信息可能已经有所发展或是发生改变。

项目中需要获取网卡的一些硬件信息，但遇到一点问题，现在用另一种方式解决了；但还是想搞懂为什么会报这个错误，基础太差，希望得到大佬的指导，非常感谢。

package main import ( "fmt" "golang.org/x/sys/unix" "syscall" "unsafe" ) func main() { for { go func() { fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP) defer func() { if err := unix.Close(fd); err != nil { fmt.Println("fd 关闭失败:", err) } }() if err != nil { fmt.Println(err) return } var et struct { Cmd uint32 Supported uint32 } const GSET = 0x1 et.Cmd = GSET var ifr struct { Name [16]byte Data uintptr } copy(ifr.Name[:], []byte("网卡名称")) ifr.Data = uintptr(unsafe.Pointer(&et)) const SIOCETHTOOL = 0x8946 // 执行这一步后，fd 就无法关闭，close 返回 bad file descriptor _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), uintptr(SIOCETHTOOL), uintptr(unsafe.Pointer(&ifr))) if errno != 0 { fmt.Println(errno) } }() } select {} }

第 1 条附言 2021-08-05 14:19:26 +08:00

已解决，结帖；ethtool_cmd结构体不全导致，从c源码抄一份完整的结构就解决了

package main import ( "fmt" "golang.org/x/sys/unix" "syscall" "time" "unsafe" ) type EthtoolCmd struct { Cmd uint32 Supported uint32 Advertising uint32 Speed uint16 Duplex uint8 Port uint8 Phy_address uint8 Transceiver uint8 Autoneg uint8 Mdio_support uint8 Maxtxpkt uint32 Maxrxpkt uint32 Speed_hi uint16 Eth_tp_mdix uint8 Reserved2 uint8 Lp_advertising uint32 Reserved [2]uint32 } type EthtoolValue struct { Cmd uint32 Data uint32 } type EthtoolDrvInfo struct { cmd uint32 driver [32]byte version [32]byte fw_version [32]byte bus_info [32]byte erom_version [32]byte reserved2 [12]byte n_priv_flags uint32 n_stats uint32 testinfo_len uint32 eedump_len uint32 regdump_len uint32 } const IFNAMSIZ = 16 type Ifreq struct { ifr_name [IFNAMSIZ]byte ifr_data uintptr } func main() { for { func() { fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP) defer func() { if err := unix.Close(fd); err != nil { fmt.Println("fd关闭失败:", err) } }() if err != nil { fmt.Println(err) return } var ifr Ifreq //var drvinfo EthtoolDrvInfo var ecmd EthtoolCmd //var edata EthtoolValue copy(ifr.ifr_name[:], []byte("eno2")) ecmd.Cmd = 0x1 ifr.ifr_data = uintptr(unsafe.Pointer(&ecmd)) _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(0x8946), uintptr(unsafe.Pointer(&ifr))) if errno != 0 { panic("ioctl 发送失败") } time.Sleep(1 * time.Second) }() } select {}

16 条回复 2021-08-06 15:44:37 +08:00