提问人：Khaled 提问时间：5/3/2023 最后编辑：Khaled 更新时间：5/12/2023 访问量：104
使用“SIOCGIWNAME”的 ioctl（） 调用将返回无线接口的 EOPNOTSUPP
ioctl() invocation with 'SIOCGIWNAME' returns EOPNOTSUPP for wireless interface
问：
我正在尝试在运行 Android 13 的 Pixel 6 上的应用的原生堆栈中运行以下代码。遗憾的是，无线接口 wlan0 的 API 调用返回错误代码 95 （EOPNOTSUPP）。ioctl()
bool isWireless()
{
int sock;
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
printf("Error opening socket, code: %d", errno);
return false;
}
struct iwreq pwrq;
memset(&pwrq, 0, sizeof(pwrq));
strncpy(pwrq.ifr_name, "wlan0", IFNAMSIZ);
int retCode = ioctl(sock, SIOCGIWNAME, &pwrq);
if (retCode != -1)
{
return true;
}
printf("Error getting wireless proto, code: %d", errno);
return false;
}
请注意，命令“adb shell ifconfig”返回以下输出
lo Link encap:UNSPEC
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope: Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:0
dummy0 Link encap:UNSPEC
inet6 addr: fe80::b8ee:36ff:fe51:a535/64 Scope: Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:840
wlan0 Link encap:UNSPEC
inet addr:192.168.25.91 Bcast:192.168.25.255 Mask:255.255.255.0
inet6 addr: fe80::8f0:61ff:feed:4ec5/64 Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7975 errors:0 dropped:0 overruns:0 frame:0
TX packets:6077 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7476175 TX bytes:1815514
此外，命令“adb shell ip addr show”返回以下内容
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether ba:ee:36:51:a5:35 brd ff:ff:ff:ff:ff:ff
inet6 fe80::b8ee:36ff:fe51:a535/64 scope link
valid_lft forever preferred_lft forever
3: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 32
link/ether 9e:4b:e5:02:26:1a brd ff:ff:ff:ff:ff:ff
4: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 32
link/ether b2:fe:7b:dc:c0:b9 brd ff:ff:ff:ff:ff:ff
5: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/ipip 0.0.0.0 brd 0.0.0.0
6: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
link/gre 0.0.0.0 brd 0.0.0.0
7: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
8: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
9: ip_vti0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/ipip 0.0.0.0 brd 0.0.0.0
10: ip6_vti0@NONE: <NOARP> mtu 1364 qdisc noop state DOWN group default qlen 1000
link/tunnel6 :: brd ::
11: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
12: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default qlen 1000
link/tunnel6 :: brd ::
13: ip6gre0@NONE: <NOARP> mtu 1448 qdisc noop state DOWN group default qlen 1000
link/gre6 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 brd 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
14: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
15: rmnet1: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
16: rmnet2: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
17: rmnet3: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
18: rmnet4: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
19: rmnet5: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
20: rmnet6: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
21: rmnet7: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
22: rmnet8: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
23: rmnet9: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
24: rmnet10: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
25: rmnet11: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
26: rmnet12: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
27: rmnet13: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
28: rmnet14: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
29: rmnet15: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
30: rmnet16: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
31: rmnet17: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
32: rmnet18: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
33: rmnet19: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
34: rmnet20: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
35: rmnet21: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
36: rmnet22: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
37: rmnet23: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
38: rmnet24: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
39: rmnet25: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
40: rmnet26: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
41: rmnet27: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
42: rmnet28: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
43: rmnet29: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
44: dummy: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/[519]
46: aware_nmi0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 00:90:4c:33:22:11 brd ff:ff:ff:ff:ff:ff
47: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 0a:f0:61:ed:4e:c5 brd ff:ff:ff:ff:ff:ff
inet 192.168.25.91/24 brd 192.168.25.255 scope global wlan0
valid_lft forever preferred_lft forever
inet6 fe80::8f0:61ff:feed:4ec5/64 scope link
valid_lft forever preferred_lft forever
48: wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether b2:21:09:31:86:ce brd ff:ff:ff:ff:ff:ff
49: dit0: <> mtu 2560 qdisc noop state DOWN group default qlen 1000
link/[519]
50: radiotap0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ieee802.11/radiotap 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
预计上述代码片段中显示的 API 调用将成功。ioctl(sock, SIOCGIWNAME, &pwrq)
你们能确认为什么 API 的行为不同吗？
答： 暂无答案
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