/usr/include/pi-sys.h is in libpisock-dev 0.12.5-dfsg-2build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | /*
 * $Id: pi-sys.h,v 1.9 2006/10/17 13:24:07 desrod Exp $
 *
 * pi-sys.h
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#ifndef _PILOT_SYS_H
#define _PILOT_SYS_H
#include "pi-args.h"
#include "pi-buffer.h"
#ifdef __cplusplus
extern "C" {
#endif
#define PI_SYS_HEADER_LEN  0
	typedef struct pi_sys_data 
	{
		unsigned char txid;
	} pi_sys_data_t;
	extern pi_protocol_t *sys_protocol
	    PI_ARGS((void));
	extern ssize_t sys_tx
	  PI_ARGS((pi_socket_t *ps, PI_CONST unsigned char *buf,
		 size_t len, int flags));
	extern ssize_t sys_rx
	  PI_ARGS((pi_socket_t *ps, pi_buffer_t *buf,
		 size_t len, int flags));
	extern void sys_dump_header
	    PI_ARGS((PI_CONST unsigned char *data, int rxtx));
	extern void sys_dump
	    PI_ARGS((PI_CONST unsigned char *data, size_t len));
#ifdef __cplusplus
}
#endif
#endif				/*_PILOT_SYSPKT_H_*/
 |