This file is indexed.

/usr/lib/bcc/include/bios.h is in elks-libc 0.16.17-3.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#ifndef __BIOS_H
#define __BIOS_H
#include <features.h>

union REGS
{
   struct { unsigned int ax, bx, cx, dx, si, di, cflag, flags; } x;
   struct { unsigned char al, ah, bl, bh, cl, ch, dl, dh; } h;
};

struct SREGS
{
   unsigned int es, cs, ss, ds;
};

unsigned int __get_cs  __P((void));
unsigned int __get_ds  __P((void));
unsigned int __get_es  __P((void));
void         __set_es  __P((unsigned int seg));
int          __peek_es __P((unsigned int off));
int          __deek_es __P((unsigned int off));

#define movedata __movedata
long _bios_get_dpt(drive);

#ifdef __LIBC__

extern int __nofiles();
extern int (*__files)();

#define CMD_OPEN	0
#define CMD_READ	1
#define CMD_WRITE	2
#define CMD_LSEEK	3
#define CMD_CLOSE	4

#endif
#endif