external/bsd/dhcpcd/dist/common.h

   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 #include "config.h"
  35 #include "defs.h"
  36
  37 #define UNCONST(a)              ((void *)(unsigned long)(const void *)(a))
  38
  39 #define timeval_to_double(tv) ((tv)->tv_sec * 1.0 + (tv)->tv_usec * 1.0e-6)
  40 #define timernorm(tvp)                                                  \
  41         do {                                                            \
  42                 while ((tvp)->tv_usec >= 1000000) {                     \
  43                         (tvp)->tv_sec++;                                \
  44                         (tvp)->tv_usec -= 1000000;                      \
  45                 }                                                       \
  46         } while (0 /* CONSTCOND */);
  47
  48 #if __GNUC__ > 2 || defined(__INTEL_COMPILER)
  49 # define _noreturn __attribute__((__noreturn__))
  50 # define _packed   __attribute__((__packed__))
  51 # define _unused   __attribute__((__unused__))
  52 #else
  53 # define _noreturn
  54 # define _packed
  55 # define _unused
  56 #endif
  57
  58 /* We don't really need this as our supported systems define __restrict
  59  * automatically for us, but it is here for completeness. */
  60 #ifndef __restrict
  61 # if defined(__lint__)
  62 #  define __restrict
  63 # elif __STDC_VERSION__ >= 199901L
  64 #  define __restrict restrict
  65 # elif !(2 < __GNUC__ || (2 == __GNU_C && 95 <= __GNUC_VERSION__))
  66 #  define __restrict
  67 # endif
  68 #endif
  69
  70 int set_cloexec(int);
  71 int set_nonblock(int);
  72 char *get_line(FILE * __restrict);
  73 extern int clock_monotonic;
  74 int get_monotonic(struct timeval *);
  75 time_t uptime(void);
  76 int writepid(int, pid_t);
  77 void *xrealloc(void *, size_t);
  78 void *xmalloc(size_t);
  79 void *xzalloc(size_t);
  80 char *xstrdup(const char *);
  81
  82 #endif