The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * speaker.h -- interface definitions for speaker ioctl()
    3  *
    4  * v1.4 by Eric S. Raymond (esr@snark.thyrsus.com) Aug 1993
    5  *      modified for FreeBSD by Andrew A. Chernov <ache@astral.msk.su>
    6  *
    7  * $FreeBSD: releng/5.4/sys/i386/include/speaker.h 145335 2005-04-20 19:11:07Z cvs2svn $
    8  */
    9 
   10 #ifndef _MACHINE_SPEAKER_H_
   11 #define _MACHINE_SPEAKER_H_
   12 
   13 #include <sys/ioccom.h>
   14 
   15 #define SPKRTONE        _IOW('S', 1, tone_t)    /* emit tone */
   16 #define SPKRTUNE        _IO('S', 2)             /* emit tone sequence*/
   17 
   18 typedef struct
   19 {
   20     int frequency;      /* in hertz */
   21     int duration;       /* in 1/100ths of a second */
   22 } tone_t;
   23 
   24 /*
   25  * Strings written to the speaker device are interpreted as tunes and played;
   26  * see the spkr(4) man page for details.
   27  */
   28 
   29 #endif /* !_MACHINE_SPEAKER_H_ */

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