1#ifndef footimevalhfoo
2#define footimevalhfoo
3
4/* $Id$ */
5
6/***
7  This file is part of avahi.
8
9  avahi is free software; you can redistribute it and/or modify it
10  under the terms of the GNU Lesser General Public License as
11  published by the Free Software Foundation; either version 2.1 of the
12  License, or (at your option) any later version.
13
14  avahi is distributed in the hope that it will be useful, but WITHOUT
15  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
17  Public License for more details.
18
19  You should have received a copy of the GNU Lesser General Public
20  License along with avahi; if not, write to the Free Software
21  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22  USA.
23***/
24
25/** \file timeval.h Functions to facilitate timeval handling */
26
27#include <inttypes.h>
28#include <sys/time.h>
29
30#include <avahi-common/cdecl.h>
31
32AVAHI_C_DECL_BEGIN
33
34/** A numeric data type for storing microsecond values. (signed 64bit integer) */
35typedef int64_t AvahiUsec;
36
37/** Compare two timeval structures and return a negative value when a < b, 0 when a == b and a positive value otherwise */
38int avahi_timeval_compare(const struct timeval *a, const struct timeval *b);
39
40/** Calculate the difference between two timeval structures as microsecond value */
41AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b);
42
43/** Add a number of microseconds to the specified timeval structure and return it. *a is modified. */
44struct timeval* avahi_timeval_add(struct timeval *a, AvahiUsec usec);
45
46/** Return the difference between the current time and *a. Positive if *a was earlier */
47AvahiUsec avahi_age(const struct timeval *a);
48
49/** Fill *tv with the current time plus "ms" milliseconds plus an
50 * extra jitter of "j" milliseconds. Pass 0 for j if you don't want
51 * the jitter */
52struct timeval *avahi_elapse_time(struct timeval *tv, unsigned ms, unsigned j);
53
54AVAHI_C_DECL_END
55
56#endif
57