ioctl to set mixer volume

[Alain De Vos]

Correct, then i have :
```
import std.stdio: writeln;
import core.sys.posix.fcntl: open,O_RDWR;
import core.sys.posix.unistd : close;
import core.sys.posix.ioctl: ioctl;
import core.stdc.config: c_ulong;

void main() {
	writeln("Set vol to max");
	char *mixerdev=cast(char *)"/dev/mixer";
	int mode=O_RDWR;
	int mixfd=open(mixerdev,mode);
	writeln(mixfd);
	c_ulong fun=3221507328;
	int vol=255*255+255;
	ioctl(mixfd,fun, &vol);
	close(mixfd);
}

```