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dhcpcd/common.h

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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef COMMON_H
#define COMMON_H
#include <sys/param.h>
#include <sys/time.h>
#include <stdio.h>
#include <syslog.h>
#include "config.h"
#include "defs.h"
#include "dhcpcd.h"
#ifndef HOSTNAME_MAX_LEN
#define HOSTNAME_MAX_LEN 250 /* 255 - 3 (FQDN) - 2 (DNS enc) */
#endif
#ifndef MIN
#define MIN(a,b) ((/*CONSTCOND*/(a)<(b))?(a):(b))
#define MAX(a,b) ((/*CONSTCOND*/(a)>(b))?(a):(b))
#endif
#define UNCONST(a) ((void *)(unsigned long)(const void *)(a))
#define STRINGIFY(a) #a
#define TOSTRING(a) STRINGIFY(a)
#define UNUSED(a) (void)(a)
#define USEC_PER_SEC 1000000L
#define USEC_PER_NSEC 1000L
#define NSEC_PER_SEC 1000000000L
#define NSEC_PER_MSEC 1000000L
#define MSEC_PER_SEC 1000L
/* Some systems don't define timespec macros */
#ifndef timespecclear
#define timespecclear(tsp) (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L)
#define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec)
#define timespeccmp(tsp, usp, cmp) \
(((tsp)->tv_sec == (usp)->tv_sec) ? \
((tsp)->tv_nsec cmp (usp)->tv_nsec) : \
((tsp)->tv_sec cmp (usp)->tv_sec))
#define timespecadd(tsp, usp, vsp) \
do { \
(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
if ((vsp)->tv_nsec >= 1000000000L) { \
(vsp)->tv_sec++; \
(vsp)->tv_nsec -= 1000000000L; \
} \
} while (/* CONSTCOND */ 0)
#define timespecsub(tsp, usp, vsp) \
do { \
(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
if ((vsp)->tv_nsec < 0) { \
(vsp)->tv_sec--; \
(vsp)->tv_nsec += 1000000000L; \
} \
} while (/* CONSTCOND */ 0)
#endif
#define timespec_to_double(tv) \
((double)(tv)->tv_sec + (double)((tv)->tv_nsec) / 1000000000.0)
#define timespecnorm(tv) do { \
while ((tv)->tv_nsec >= NSEC_PER_SEC) { \
(tv)->tv_sec++; \
(tv)->tv_nsec -= NSEC_PER_SEC; \
} \
} while (0 /* CONSTCOND */);
#define ts_to_ms(ms, tv) do { \
ms = (tv)->tv_sec * MSEC_PER_SEC; \
ms += (tv)->tv_nsec / NSEC_PER_MSEC; \
} while (0 /* CONSTCOND */);
#define ms_to_ts(tv, ms) do { \
(tv)->tv_sec = ms / MSEC_PER_SEC; \
(tv)->tv_nsec = (suseconds_t)(ms - ((tv)->tv_sec * MSEC_PER_SEC)) \
* NSEC_PER_MSEC; \
} while (0 /* CONSTCOND */);
#ifndef TIMEVAL_TO_TIMESPEC
#define TIMEVAL_TO_TIMESPEC(tv, ts) do { \
(ts)->tv_sec = (tv)->tv_sec; \
(ts)->tv_nsec = (tv)->tv_usec * USEC_PER_NSEC; \
} while (0 /* CONSTCOND */)
#endif
#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
# ifndef __dead
# define __dead __attribute__((__noreturn__))
# endif
# ifndef __packed
# define __packed __attribute__((__packed__))
# endif
# ifndef __printflike
# define __printflike(a, b) __attribute__((format(printf, a, b)))
# endif
# ifndef __unused
# define __unused __attribute__((__unused__))
# endif
#else
# ifndef __dead
# define __dead
# endif
# ifndef __packed
# define __packed
# endif
# ifndef __printflike
# define __printflike
# endif
# ifndef __unused
# define __unused
# endif
#endif
#ifndef __arraycount
#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
#endif
/* We don't really need this as our supported systems define __restrict
* automatically for us, but it is here for completeness. */
#ifndef __restrict
# if defined(__lint__)
# define __restrict
# elif __STDC_VERSION__ >= 199901L
# define __restrict restrict
# elif !(2 < __GNUC__ || (2 == __GNU_C && 95 <= __GNUC_VERSION__))
# define __restrict
# endif
#endif
void get_line_free(void);
const char *get_hostname(char *, size_t, int);
extern int clock_monotonic;
int get_monotonic(struct timespec *);
/* We could shave a few k off the binary size by just using the
* syslog(3) interface.
* However, this results in a ugly output on the command line
* and relies on syslogd(8) starting before dhcpcd which is not
* always the case. */
#ifndef USE_LOGFILE
# define USE_LOGFILE 1
#endif
#if USE_LOGFILE
void logger_open(struct dhcpcd_ctx *);
#define logger_mask(ctx, lvl) setlogmask((lvl))
__printflike(3, 4) void logger(struct dhcpcd_ctx *, int, const char *, ...);
void logger_close(struct dhcpcd_ctx *);
#else
#define logger_open(ctx) openlog(PACKAGE, LOG_PERROR | LOG_PID, LOG_DAEMON)
#define logger_mask(ctx, lvl) setlogmask((lvl))
#define logger(ctx, pri, fmt, ...) \
do { \
UNUSED((ctx)); \
syslog((pri), (fmt), ##__VA_ARGS__); \
} while (0 /*CONSTCOND */)
#define logger_close(ctx) closelog()
#endif
ssize_t setvar(struct dhcpcd_ctx *,
char ***, const char *, const char *, const char *);
ssize_t setvard(struct dhcpcd_ctx *,
char ***, const char *, const char *, size_t);
time_t uptime(void);
char *hwaddr_ntoa(const unsigned char *, size_t, char *, size_t);
size_t hwaddr_aton(unsigned char *, const char *);
#endif
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