FreeBSD/Linux Kernel Cross Reference
sys/i386/include/speaker.h

     /*
      * speaker.h -- interface definitions for speaker ioctl()
      *
      * v1.4 by Eric S. Raymond (esr@snark.thyrsus.com) Aug 1993
      *      modified for FreeBSD by Andrew A. Chernov <ache@astral.msk.su>
      *
      * $FreeBSD: src/sys/i386/include/speaker.h,v 1.3.2.1 1999/09/05 08:12:05 peter Exp $
      */
     
    #ifndef _MACHINE_SPEAKER_H_
    #define _MACHINE_SPEAKER_H_
    
    #include <sys/ioccom.h>
    
    #define SPKRTONE        _IOW('S', 1, tone_t)    /* emit tone */
    #define SPKRTUNE        _IO('S', 2)             /* emit tone sequence*/
    
    typedef struct
    {
        int frequency;      /* in hertz */
        int duration;       /* in 1/100ths of a second */
    }
    tone_t;
    
    /*
     * Strings written to the speaker device are interpreted as tunes and played;
     * see the spkr(4) man page for details.
     */
    
    #endif /* !_MACHINE_SPEAKER_H_ */

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