c - 打开 /dev/hidraw2 可以用 steamcontroller 挂起

问题描述

我的问题是在“/dev/hidraw2”上打开一个蒸汽控制器，这有时会导致程序挂起。我最大的问题是我不知道在哪里报告这个问题，所以我希望有人知道去哪里解决这个问题。

问题： 我有一个正在运行的 Arch Linux，它连接了一个蒸汽控制器（与提供的加密狗连接）。当试图通过打开 '/dev/hidraw2' 来访问设备时，我的程序卡在了“open”调用中。我的程序就是不返回。也无法用杀死它kill -9。恢复的唯一方法是重新启动我的机器。

我将有问题的代码减少为：

// compiled with gcc main.c
#include <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>

int main() {
    for(;;) {
        printf("opening steam controller\n");
        # It doesn't return from the following open
        int fd = open("/dev/hidraw2", O_RDWR | O_NONBLOCK | O_CLOEXEC);

        printf("closing steam controller\n");
        if (fd != -1) {
            close(fd);
        }
        usleep(100000);
    }
    return 0;
}

要重现，您必须插入蒸汽控制器加密狗，启动上述程序，然后打开蒸汽控制器（它不会每次都挂起，因此您可能需要关闭控制器并重新打开）。

关于我的机器的更多信息：

$ uname -a
Linux schenker 4.20.7-arch1-1-ARCH #1 SMP PREEMPT Wed Feb 6 18:42:40 UTC 2019 x86_64 GNU/Linux
$ gcc --version                                                                                                   
gcc (GCC) 8.2.1 20181127

我该如何调查有关此问题的更多信息？我必须深入了解蒸汽控制器驱动程序吗？还是 hidraw 层的更多问题？

更新：

请求dmesg的输出。重现错误需要 3 次尝试。我似乎注意到了可疑之处：

[  141.161817] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' connected
[  141.163527] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input34                                                                                                         
[  151.291873] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input35                                                                                                         
[  152.940759] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input36                                                                                                         
[  155.287349] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input37                                                                                                         
[  160.634001] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' disconnected
[  172.665613] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' connected
[  172.667006] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input38                                                                                                         
[  181.306918] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' disconnected
[  185.465807] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' connected
[  185.467249] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input39                                                                                                         
[  187.030851] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input40                                                                                                         
[  192.673722] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' disconnected
[  196.937743] hid-steam 0003:28DE:1142.0002: Steam Controller 'XXXXXXXXXX' connected
[  196.939272] input: Wireless Steam Controller as /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/0003:28DE:1142.0002/input/input41

Update2 还有一些 strace 输出：

openat(AT_FDCWD, "/dev/hidraw1", O_RDWR|O_NONBLOCK|O_CLOEXEC) = 3
write(1, "closing steam controller /dev/hi"..., 38closing steam controller /dev/hidraw1
) = 38
close(3)                                = 0
nanosleep({tv_sec=0, tv_nsec=100000000}, NULL) = 0
write(1, "opening steam controller /dev/hi"..., 38opening steam controller /dev/hidraw1
) = 38
openat(AT_FDCWD, "/dev/hidraw1", O_RDWR|O_NONBLOCK|O_CLOEXEC

这个问题不仅限于 hidraw2 也可能发生在 hidraw1 上（我想这取决于实际的蒸汽控制器连接到哪里）

我还注意到，当我的程序卡住并且我在另一个控制台上调用启动第二个实例时，它会立即挂起，open()独立于控制器的关闭/开启状态。

标签： clinuxcontrollersteam

c - 打开 /dev/hidraw2 可以用 steamcontroller 挂起

问题描述

解决方案

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