On Tue, 2 Apr 2002, Michael Zhu wrote:
> Hi, smart gurus, I have a question while writing a
> Makefile file to install my device driver. In my
> device driver I dynamically allocate the major number
> of my device. In my Makefile I want to build a device
> node for my device under the /dev directory.
>
> mknod /dev/mydevice c $major 0;
>
> So I need to know the major number of my deivce in the
> Makefile. I've read the Linux 'Device Driver'. There
> is some information about this. I use the following
> command to get the major number in my Makefile.
>
> major=`awk "\\$2==\"$mymodule\" {printf \\$1}"
> /proc/devices`
>
> But when I use the 'make install' command to install
> my driver, the following error returned.
>
> major=`awk "\\==\"$ymodule\" {printf \\}"
> /proc/devices`
> awk: 0: unexpected character '\'
> awk: line 1: syntax error at or near ==
> make: *** [install] Error 2
>
> What is wrong with my command? Can anyone tell me how
> to get the major number in Makefile.
>
> Thank you very much.
`make` will interpret '$', you need $$ in the Makefile.
Also, you may not want to 'acquire' major numbers this way. Your
module may work only on the machine that built it.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Windows-2000/Professional isn't.
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This archive was generated by hypermail 2b29 : Sun Apr 07 2002 - 22:00:09 EST