bash 如何在shell脚本中调用ioctl？
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How to invoke ioctl in shell script?
提问by Hung-Te Lin
I'm trying to execute an ioctl call on a system with only bash and primitive base utilities.
我试图在只有 bash 和原始基本实用程序的系统上执行 ioctl 调用。
Is there any way to execute arbitrary ioctl command (if the params are simply integers) to a specific device file in /dev in shell script, without writing C / perl / python programs? Something like "magic_ioctl /dev/console 30 1 2" which would calls "ioctl(open("/dev/console"), 30, 1, 2);".
有没有办法在shell脚本中对/dev中的特定设备文件执行任意ioctl命令（如果参数只是整数），而无需编写C/perl/python程序？类似于“magic_ioctl /dev/console 30 1 2”，它会调用“ioctl(open("/dev/console"), 30, 1, 2);”。
回答by Jér?me Pouiller
I wrote ioctltool exactly for this purpose: https://github.com/jerome-pouiller/ioctl.
我ioctl正是为此目的编写了工具：https: //github.com/jerome-pouiller/ioctl。
Currently, it is not possible to pass multiple argument to ioctl call. Have you an example where it would be usefull?
目前，无法将多个参数传递给 ioctl 调用。你有一个有用的例子吗？
If you want to call ioctl(open("/dev/console"), 30, 1);, you can run:
如果你想调用ioctl(open("/dev/console"), 30, 1);，你可以运行：
ioctl /dev/console 30 -v 1
However, for most ioctl, you want to allocate a buffer and pass a pointer to this buffer in argument to ioctl call. In this case, just forget -v. ioctlwill read/write buffer content from/to standard input/output. ioctltry to guess buffer size and direction from ioctl number.
但是，对于大多数 ioctl，您希望分配一个缓冲区并将指向该缓冲区的指针作为参数传递给 ioctl 调用。在这种情况下，只需忘记-v。ioctl将从/向标准输入/输出读取/写入缓冲区内容。ioctl尝试从 ioctl 数字猜测缓冲区大小和方向。
The best is: ioctlunderstand many (around 2200) ioctl symbolic names. Thus you can call:
最好的是：ioctl了解许多（大约 2200 个）ioctl 符号名称。因此你可以调用：
ioctl /dev/video0 VIDIOC_QUERYCAP > video_caps
回答by Sergey Beduev
Why you reject perl/c/python solutions ?
You can made this by perl one-liner like this:
perl -e require "sys/ioctl.ph"; ioctl(...);
为什么你拒绝 perl/c/python 解决方案？你可以像这样通过 perl one-liner 做到这一点：
perl -e require "sys/ioctl.ph"; ioctl(...);
