freebsd-dev/sys/i386/isa/gpib.h

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/* gpib data structures */
struct gpibdata {
char *data; /* data string for ins and outs */
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unsigned char address; /* gpib address */
int *count;
} ;
/* IOCTL commands */
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#define GPIBWRITE _IOW('g',1,struct gpibdata)
#define GPIBREAD _IOW('g',2,struct gpibdata)
#define GPIBINIT _IOW('g',3,struct gpibdata)
#define GPIBTRIGGER _IOW('g',4,struct gpibdata)
#define GPIBREMOTE _IOW('g',5,struct gpibdata)
#define GPIBLOCAL _IOW('g',6,struct gpibdata)
#define GPIBMTRIGGER _IOW('g',7,struct gpibdata)
#define GPIBMREMOTE _IOW('g',8,struct gpibdata)
#define GPIBMLOCAL _IOW('g',9,struct gpibdata)
#define GPIBSPOLL _IOW('g',10,struct gpibdata)