Re: Beeping in Linux

On Sun, 2024-10-27 at 08:21 +0000, Muttley@dastardlyhq.com wrote:

I'm looking at a way of making the machine beep without relying on having=

a=20

TTY available to send \7 to or going all heavyweight with ALSA.=20
=20
I've found something online that mentioned ioctl() + the KDMTONE option b=

ut I=20

can't find any example code. Does anyone know how its done?
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Thanks for any help
=20

>
This is the beep(..) implement in libwy https://sourceforge.net/projects/cs=
call/files/latest/download
Root privilege is required.
>
/* Copyright is licensed by GNU LGPL, see file COPYING.       by I.J.Wang 2=
018
=20
  This file is header only
*/
#ifndef WY_IOCTL_H__
#define WY_IOCTL_H__
#define WY_IOCTL_VERSION 69
>
#include <sys/ioctl.h>
#include <linux/kd.h>
>
#ifndef CLOCK_TICK_RATE
#define CLOCK_TICK_RATE 1193180
#endif
>
namespace Wy {
>
inline
Wy::Errno beep(Wy::FileHandle fh, unsigned int freq, unsigned int msec)
{
Wy::Errno r;
if(((msec&0xffff)!=3Dmsec)||(freq<=3D0)||(CLOCK_TICK_RATE/freq>0xffff)) {
  WY_RETURN( EINVAL );
}
if((::ioctl(fh.fd(),KDMKTONE,( (msec<<16)|(CLOCK_TICK_RATE/freq) )))=3D=3D=
-1) {
  WY_RETURN(errno);
}
return Wy::Ok;
};
>
}; // end namespce Wy
>
#endif // end WY_IOCTL_H__