1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2018 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 <sys/param.h> 32 #include <sys/time.h> 33 #include <stdio.h> 34 35 #include "config.h" 36 #include "defs.h" 37 #include "dhcpcd.h" 38 39 #ifndef HOSTNAME_MAX_LEN 40 #define HOSTNAME_MAX_LEN 250 /* 255 - 3 (FQDN) - 2 (DNS enc) */ 41 #endif 42 43 #ifndef MIN 44 #define MIN(a,b) ((/*CONSTCOND*/(a)<(b))?(a):(b)) 45 #define MAX(a,b) ((/*CONSTCOND*/(a)>(b))?(a):(b)) 46 #endif 47 48 #define UNCONST(a) ((void *)(unsigned long)(const void *)(a)) 49 #define STRINGIFY(a) #a 50 #define TOSTRING(a) STRINGIFY(a) 51 #define UNUSED(a) (void)(a) 52 53 #define ROUNDUP4(a) (1 + (((a) - 1) | 3)) 54 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 55 56 #define USEC_PER_SEC 1000000L 57 #define USEC_PER_NSEC 1000L 58 #define NSEC_PER_SEC 1000000000L 59 #define NSEC_PER_MSEC 1000000L 60 #define MSEC_PER_SEC 1000L 61 #define CSEC_PER_SEC 100L 62 #define NSEC_PER_CSEC 10000000L 63 64 /* Some systems don't define timespec macros */ 65 #ifndef timespecclear 66 #define timespecclear(tsp) (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L) 67 #define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec) 68 #define timespeccmp(tsp, usp, cmp) \ 69 (((tsp)->tv_sec == (usp)->tv_sec) ? \ 70 ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \ 71 ((tsp)->tv_sec cmp (usp)->tv_sec)) 72 #define timespecadd(tsp, usp, vsp) \ 73 do { \ 74 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \ 75 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \ 76 if ((vsp)->tv_nsec >= 1000000000L) { \ 77 (vsp)->tv_sec++; \ 78 (vsp)->tv_nsec -= 1000000000L; \ 79 } \ 80 } while (/* CONSTCOND */ 0) 81 #define timespecsub(tsp, usp, vsp) \ 82 do { \ 83 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \ 84 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \ 85 if ((vsp)->tv_nsec < 0) { \ 86 (vsp)->tv_sec--; \ 87 (vsp)->tv_nsec += 1000000000L; \ 88 } \ 89 } while (/* CONSTCOND */ 0) 90 #endif 91 92 #define timespec_to_double(tv) \ 93 ((double)(tv)->tv_sec + (double)((tv)->tv_nsec) / 1000000000.0) 94 #define timespecnorm(tv) do { \ 95 while ((tv)->tv_nsec >= NSEC_PER_SEC) { \ 96 (tv)->tv_sec++; \ 97 (tv)->tv_nsec -= NSEC_PER_SEC; \ 98 } \ 99 } while (0 /* CONSTCOND */); 100 #define ts_to_ms(ms, tv) do { \ 101 ms = (tv)->tv_sec * MSEC_PER_SEC; \ 102 ms += (tv)->tv_nsec / NSEC_PER_MSEC; \ 103 } while (0 /* CONSTCOND */); 104 #define ms_to_ts(tv, ms) do { \ 105 (tv)->tv_sec = ms / MSEC_PER_SEC; \ 106 (tv)->tv_nsec = (suseconds_t)(ms - ((tv)->tv_sec * MSEC_PER_SEC)) \ 107 * NSEC_PER_MSEC; \ 108 } while (0 /* CONSTCOND */); 109 110 #ifndef TIMEVAL_TO_TIMESPEC 111 #define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ 112 (ts)->tv_sec = (tv)->tv_sec; \ 113 (ts)->tv_nsec = (tv)->tv_usec * USEC_PER_NSEC; \ 114 } while (0 /* CONSTCOND */) 115 #endif 116 117 #if __GNUC__ > 2 || defined(__INTEL_COMPILER) 118 # ifndef __packed 119 # define __packed __attribute__((__packed__)) 120 # endif 121 # ifndef __unused 122 # define __unused __attribute__((__unused__)) 123 # endif 124 #else 125 # ifndef __packed 126 # define __packed 127 # endif 128 # ifndef __unused 129 # define __unused 130 # endif 131 #endif 132 133 /* 134 * Compile Time Assertion. 135 */ 136 #ifndef __CTASSERT 137 # ifdef __COUNTER__ 138 # define __CTASSERT(x) __CTASSERT0(x, __ctassert, __COUNTER__) 139 # else 140 # define __CTASSERT(x) __CTASSERT99(x, __INCLUDE_LEVEL__, __LINE__) 141 # define __CTASSERT99(x, a, b) __CTASSERT0(x, __CONCAT(__ctassert,a), \ 142 __CONCAT(_,b)) 143 # endif 144 # define __CTASSERT0(x, y, z) __CTASSERT1(x, y, z) 145 # define __CTASSERT1(x, y, z) typedef char y ## z[/*CONSTCOND*/(x) ? 1 : -1] __unused 146 #endif 147 148 #ifndef __arraycount 149 # define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) 150 #endif 151 152 /* We don't really need this as our supported systems define __restrict 153 * automatically for us, but it is here for completeness. */ 154 #ifndef __restrict 155 # if defined(__lint__) 156 # define __restrict 157 # elif __STDC_VERSION__ >= 199901L 158 # define __restrict restrict 159 # elif !(2 < __GNUC__ || (2 == __GNU_C && 95 <= __GNUC_VERSION__)) 160 # define __restrict 161 # endif 162 #endif 163 164 void get_line_free(void); 165 extern int clock_monotonic; 166 int get_monotonic(struct timespec *); 167 168 ssize_t setvar(char **, const char *, const char *, const char *); 169 ssize_t setvard(char **, const char *, const char *, size_t); 170 ssize_t addvar(char ***, const char *, const char *, const char *); 171 ssize_t addvard(char ***, const char *, const char *, size_t); 172 173 const char *hwaddr_ntoa(const void *, size_t, char *, size_t); 174 size_t hwaddr_aton(uint8_t *, const char *); 175 size_t read_hwaddr_aton(uint8_t **, const char *); 176 177 ssize_t recvmsg_realloc(int, struct msghdr *, int); 178 #endif 179