1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef COMMON_H
29#define COMMON_H
30
31#include <stdio.h>
32#include <time.h>
33
34#define UNCONST(a)		((void *)(unsigned long)(const void *)(a))
35
36#define timeval_to_double(tv) ((tv)->tv_sec * 1.0 + (tv)->tv_usec * 1.0e-6)
37#define timernorm(tvp)							\
38	do {								\
39		while ((tvp)->tv_usec >= 1000000) {			\
40			(tvp)->tv_sec++;				\
41			(tvp)->tv_usec -= 1000000;			\
42		}							\
43	} while (0 /* CONSTCOND */);
44
45#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
46# define _noreturn __attribute__((__noreturn__))
47# define _packed   __attribute__((__packed__))
48# define _unused   __attribute__((__unused__))
49#else
50# define _noreturn
51# define _packed
52# define _unused
53#endif
54
55/* We don't really need this as our supported systems define __restrict
56 * automatically for us, but it is here for completeness. */
57#ifndef __restrict
58# if defined(__lint__)
59#  define __restrict
60# elif __STDC_VERSION__ >= 199901L
61#  define __restrict restrict
62# elif !(2 < __GNUC__ || (2 == __GNU_C && 95 <= __GNUC_VERSION__))
63#  define __restrict
64# endif
65#endif
66
67int set_nonblock(int);
68extern int clock_monotonic;
69int get_monotonic(struct timeval *);
70time_t uptime(void);
71void *xrealloc(void *, size_t);
72void *xmalloc(size_t);
73void *xzalloc(size_t);
74char *xstrdup(const char *);
75
76#endif
77