I wrote a similar program to control the brightness; it's a C program which
sets the value and can be run through awesome's run command.
The advantage of writing a simple C program to do this (and storing it in
/usr/local/bin) is that the setuid bit can be set; this makes the program
run as root no matter who runs it. Shell scripts can't have the setuid bit
set.
Here is the C program:
#include<stdio.h>
int main(int argc, char **argv) {
if(argc <= 1) {
return 0;
}
char* bright = argv[1];
char buf[300];
int n = snprintf(buf, 300, "sh -c \"echo %s >
/sys/class/backlight/acpi_video0/brightness\"", bright);
if(n < 0 || n > 300) {
puts("Error formatting string\n");
return 1;
}
system(buf);
return 0;
}
Compile this, copy it to /usr/local/bin, then run 'sudo chmod u+s <program>'
to set the setuid bit, allowing it to run as root.
Please feel free to use this program from your lua script.
Will Shackleton
On 25 October 2011 16:58, Daniel Hilst Selli <[email protected]> wrote:
> Hey, I build a little class to control brithness, but for it I have to read
> and write to /sys/class/backlight/acpi_**video0/brightness. Only root
> can do it.. and the permissions are reset on reboot..
>
> Here is the code http://ideone.com/lhFDQ
>
> Any idea??
>
> Thanks!
>
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