/usr/include/isc/serial.h is in libbind-dev 1:9.11.3+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 1999-2001, 2004-2007, 2009, 2016 Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/* $Id: serial.h,v 1.18 2009/01/18 23:48:14 tbox Exp $ */
#ifndef ISC_SERIAL_H
#define ISC_SERIAL_H 1
#include <isc/lang.h>
#include <isc/types.h>
/*! \file isc/serial.h
* \brief Implement 32 bit serial space arithmetic comparison functions.
* Note: Undefined results are returned as ISC_FALSE.
*/
/***
*** Functions
***/
ISC_LANG_BEGINDECLS
isc_boolean_t
isc_serial_lt(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' < 'b' otherwise false.
*/
isc_boolean_t
isc_serial_gt(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' > 'b' otherwise false.
*/
isc_boolean_t
isc_serial_le(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' <= 'b' otherwise false.
*/
isc_boolean_t
isc_serial_ge(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' >= 'b' otherwise false.
*/
isc_boolean_t
isc_serial_eq(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' == 'b' otherwise false.
*/
isc_boolean_t
isc_serial_ne(isc_uint32_t a, isc_uint32_t b);
/*%<
* Return true if 'a' != 'b' otherwise false.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_SERIAL_H */
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