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/dev/isa/spkrio.h

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    1 /*      $NetBSD: spkrio.h,v 1.1 1998/04/15 20:26:19 drochner Exp $      */
    2 
    3 /*
    4  * spkr.h -- interface definitions for speaker ioctl()
    5  */
    6 
    7 #ifndef _DEV_ISA_SPKR_H_
    8 #define _DEV_ISA_SPKR_H_
    9 
   10 #define SPKRTONE        _IOW('S', 1, tone_t)    /* emit tone */
   11 #define SPKRTUNE        _IO('S', 2)             /* emit tone sequence */
   12 
   13 typedef struct {
   14         int     frequency;      /* in hertz */
   15         int     duration;       /* in 1/100ths of a second */
   16 } tone_t;
   17 
   18 #endif /* _DEV_ISA_SPKR_H_ */

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