ioctl to set mixer volume

[Boris Carvajal]

On Saturday, 17 April 2021 at 00:05:41 UTC, Alain De Vos wrote:
> After some fiddling i finally got it.
> A d-lang program which sets my volume to zero.
> ```
> import std.stdio;
> import core.sys.posix.ioctl;
> import core.stdc.config;
> import core.stdc.stdio;
> void main() {
> writeln("Set vol to min");
> char *mixerdev=cast(char *)"/dev/mixer";
> char *mode=cast(char *)"rw";
> int mixfd=(fopen(mixerdev,mode)).fileno;
> writeln(mixfd);
> c_ulong x=3221507328;
> int left=0;
> ioctl(mixfd,x, &left);
> }
> ```
> The function .fileno returns the "underlying handle" of the 
> FILE "object".

Here you could avoid C stdio and just use posix functions like 
`core.sys.posix.fcntl
  : open` that returns a file descriptor directly.