1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the Computer Systems 17 * Engineering Group at Lawrence Berkeley Laboratory. 18 * 4. Neither the name of the University nor of the Laboratory may be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lib_pcap_funcattrs_h 36 #define lib_pcap_funcattrs_h 37 38 #include <pcap/compiler-tests.h> 39 40 /* 41 * Attributes to apply to functions and their arguments, using various 42 * compiler-specific extensions. 43 */ 44 45 /* 46 * PCAP_API_DEF must be used when defining *data* exported from 47 * libpcap. It can be used when defining *functions* exported 48 * from libpcap, but it doesn't have to be used there. It 49 * should not be used in declarations in headers. 50 * 51 * PCAP_API must be used when *declaring* data or functions 52 * exported from libpcap; PCAP_API_DEF won't work on all platforms. 53 */ 54 55 #if defined(_WIN32) 56 /* 57 * For Windows: 58 * 59 * when building libpcap: 60 * 61 * if we're building it as a DLL, we have to declare API 62 * functions with __declspec(dllexport); 63 * 64 * if we're building it as a static library, we don't want 65 * to do so. 66 * 67 * when using libpcap: 68 * 69 * if we're using the DLL, calls to its functions are a 70 * little more efficient if they're declared with 71 * __declspec(dllimport); 72 * 73 * if we're not using the dll, we don't want to declare 74 * them that way. 75 * 76 * So: 77 * 78 * if pcap_EXPORTS is defined, we define PCAP_API_DEF as 79 * __declspec(dllexport); 80 * 81 * if PCAP_DLL is defined, we define PCAP_API_DEF as 82 * __declspec(dllimport); 83 * 84 * otherwise, we define PCAP_API_DEF as nothing. 85 */ 86 #if defined(pcap_EXPORTS) 87 /* 88 * We're compiling libpcap as a DLL, so we should export functions 89 * in our API. 90 */ 91 #define PCAP_API_DEF __declspec(dllexport) 92 #elif defined(PCAP_DLL) 93 /* 94 * We're using libpcap as a DLL, so the calls will be a little more 95 * efficient if we explicitly import the functions. 96 */ 97 #define PCAP_API_DEF __declspec(dllimport) 98 #else 99 /* 100 * Either we're building libpcap as a static library, or we're using 101 * it as a static library, or we don't know for certain that we're 102 * using it as a dynamic library, so neither import nor export the 103 * functions explicitly. 104 */ 105 #define PCAP_API_DEF 106 #endif 107 #elif defined(MSDOS) 108 /* XXX - does this need special treatment? */ 109 #define PCAP_API_DEF 110 #else /* UN*X */ 111 #ifdef pcap_EXPORTS 112 /* 113 * We're compiling libpcap as a (dynamic) shared library, so we should 114 * export functions in our API. The compiler might be configured not 115 * to export functions from a shared library by default, so we might 116 * have to explicitly mark functions as exported. 117 */ 118 #if PCAP_IS_AT_LEAST_GNUC_VERSION(3,4) \ 119 || PCAP_IS_AT_LEAST_XL_C_VERSION(12,0) 120 /* 121 * GCC 3.4 or later, or some compiler asserting compatibility with 122 * GCC 3.4 or later, or XL C 13.0 or later, so we have 123 * __attribute__((visibility()). 124 */ 125 #define PCAP_API_DEF __attribute__((visibility("default"))) 126 #elif PCAP_IS_AT_LEAST_SUNC_VERSION(5,5) 127 /* 128 * Sun C 5.5 or later, so we have __global. 129 * (Sun C 5.9 and later also have __attribute__((visibility()), 130 * but there's no reason to prefer it with Sun C.) 131 */ 132 #define PCAP_API_DEF __global 133 #else 134 /* 135 * We don't have anything to say. 136 */ 137 #define PCAP_API_DEF 138 #endif 139 #else 140 /* 141 * We're not building libpcap. 142 */ 143 #define PCAP_API_DEF 144 #endif 145 #endif /* _WIN32/MSDOS/UN*X */ 146 147 #define PCAP_API PCAP_API_DEF extern 148 149 /* 150 * Definitions to 1) indicate what version of libpcap first had a given 151 * API and 2) allow upstream providers whose build environments allow 152 * APIs to be designated as "first available in this release" to do so 153 * by appropriately defining them. 154 * 155 * Yes, that's you, Apple. :-) Please define PCAP_AVAILABLE_MACOS() 156 * as necessary to make various APIs "weak exports" to make it easier 157 * for software that's distributed in binary form and that uses libpcap 158 * to run on multiple macOS versions and use new APIs when available. 159 * (Yes, such third-party software exists - Wireshark provides binary 160 * packages for macOS, for example. tcpdump doesn't count, as that's 161 * provided by Apple, so each release can come with a version compiled 162 * to use the APIs present in that release.) 163 * 164 * We don't define it ourselves because, if you're building and 165 * installing libpcap on macOS yourself, the APIs will be available 166 * no matter what OS version you're installing it on. 167 * 168 * For other platforms, we don't define them, leaving it up to 169 * others to do so based on their OS versions, if appropriate. 170 * 171 * We start with libpcap 0.4, as that was the last LBL release, and 172 * I've never seen earlier releases. 173 */ 174 #ifdef __APPLE__ 175 #define PCAP_AVAILABLE_MACOS(v) /* define to say "first appears in v" */ 176 #define PCAP_AVAILABLE_0_4 PCAP_AVAILABLE_MACOS(10.0) /* Did any version of Mac OS X ship with this? */ 177 #define PCAP_AVAILABLE_0_5 PCAP_AVAILABLE_MACOS(10.0) /* Did any version of Mac OS X ship with this? */ 178 #define PCAP_AVAILABLE_0_6 PCAP_AVAILABLE_MACOS(10.1) 179 #define PCAP_AVAILABLE_0_7 PCAP_AVAILABLE_MACOS(10.4) 180 #define PCAP_AVAILABLE_0_8 PCAP_AVAILABLE_MACOS(10.4) 181 #define PCAP_AVAILABLE_0_9 PCAP_AVAILABLE_MACOS(10.5) 182 #define PCAP_AVAILABLE_1_0 PCAP_AVAILABLE_MACOS(10.6) 183 /* #define PCAP_AVAILABLE_1_1 no routines added to the API */ 184 #define PCAP_AVAILABLE_1_2 PCAP_AVAILABLE_MACOS(10.9) 185 /* #define PCAP_AVAILABLE_1_3 no routines added to the API */ 186 /* #define PCAP_AVAILABLE_1_4 no routines added to the API */ 187 #define PCAP_AVAILABLE_1_5 PCAP_AVAILABLE_MACOS(10.10) 188 /* #define PCAP_AVAILABLE_1_6 no routines added to the API */ 189 #define PCAP_AVAILABLE_1_7 PCAP_AVAILABLE_MACOS(10.12) 190 #define PCAP_AVAILABLE_1_8 PCAP_AVAILABLE_MACOS(10.13) /* only Windows adds routines to the API; XXX - what version first had it? */ 191 #define PCAP_AVAILABLE_1_9 PCAP_AVAILABLE_MACOS(10.13) 192 #define PCAP_AVAILABLE_1_10 /* not released yet, so not in macOS yet */ 193 #else /* __APPLE__ */ 194 #define PCAP_AVAILABLE_0_4 195 #define PCAP_AVAILABLE_0_5 196 #define PCAP_AVAILABLE_0_6 197 #define PCAP_AVAILABLE_0_7 198 #define PCAP_AVAILABLE_0_8 199 #define PCAP_AVAILABLE_0_9 200 #define PCAP_AVAILABLE_1_0 201 /* #define PCAP_AVAILABLE_1_1 no routines added to the API */ 202 #define PCAP_AVAILABLE_1_2 203 /* #define PCAP_AVAILABLE_1_3 no routines added to the API */ 204 /* #define PCAP_AVAILABLE_1_4 no routines added to the API */ 205 #define PCAP_AVAILABLE_1_5 206 /* #define PCAP_AVAILABLE_1_6 no routines added to the API */ 207 #define PCAP_AVAILABLE_1_7 208 #define PCAP_AVAILABLE_1_8 209 #define PCAP_AVAILABLE_1_9 210 #define PCAP_AVAILABLE_1_10 211 #endif /* __APPLE__ */ 212 213 /* 214 * PCAP_NORETURN, before a function declaration, means "this function 215 * never returns". (It must go before the function declaration, e.g. 216 * "extern PCAP_NORETURN func(...)" rather than after the function 217 * declaration, as the MSVC version has to go before the declaration.) 218 * 219 * PCAP_NORETURN_DEF, before a function *definition*, means "this 220 * function never returns"; it would be used only for static functions 221 * that are defined before any use, and thus have no declaration. 222 * (MSVC doesn't support that; I guess the "decl" in "__declspec" 223 * means "declaration", and __declspec doesn't work with definitions.) 224 */ 225 #if __has_attribute(noreturn) \ 226 || PCAP_IS_AT_LEAST_GNUC_VERSION(2,5) \ 227 || PCAP_IS_AT_LEAST_SUNC_VERSION(5,9) \ 228 || PCAP_IS_AT_LEAST_XL_C_VERSION(10,1) \ 229 || PCAP_IS_AT_LEAST_HP_C_VERSION(6,10) 230 /* 231 * Compiler with support for __attribute((noreturn)), or GCC 2.5 or 232 * later, or some compiler asserting compatibility with GCC 2.5 or 233 * later, or Solaris Studio 12 (Sun C 5.9) or later, or IBM XL C 10.1 234 * or later (do any earlier versions of XL C support this?), or HP aCC 235 * A.06.10 or later. 236 */ 237 #define PCAP_NORETURN __attribute((noreturn)) 238 #define PCAP_NORETURN_DEF __attribute((noreturn)) 239 #elif defined(_MSC_VER) 240 /* 241 * MSVC. 242 */ 243 #define PCAP_NORETURN __declspec(noreturn) 244 #define PCAP_NORETURN_DEF 245 #else 246 #define PCAP_NORETURN 247 #define PCAP_NORETURN_DEF 248 #endif 249 250 /* 251 * PCAP_PRINTFLIKE(x,y), after a function declaration, means "this function 252 * does printf-style formatting, with the xth argument being the format 253 * string and the yth argument being the first argument for the format 254 * string". 255 */ 256 #if __has_attribute(__format__) \ 257 || PCAP_IS_AT_LEAST_GNUC_VERSION(2,3) \ 258 || PCAP_IS_AT_LEAST_XL_C_VERSION(10,1) \ 259 || PCAP_IS_AT_LEAST_HP_C_VERSION(6,10) 260 /* 261 * Compiler with support for it, or GCC 2.3 or later, or some compiler 262 * asserting compatibility with GCC 2.3 or later, or IBM XL C 10.1 263 * and later (do any earlier versions of XL C support this?), 264 * or HP aCC A.06.10 and later. 265 */ 266 #define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y))) 267 #else 268 #define PCAP_PRINTFLIKE(x,y) 269 #endif 270 271 /* 272 * PCAP_DEPRECATED(func, msg), after a function declaration, marks the 273 * function as deprecated. 274 * 275 * The first argument is the name of the function; the second argument is 276 * a string giving the warning message to use if the compiler supports that. 277 * 278 * (Thank you, Microsoft, for requiring the function name.) 279 */ 280 #if __has_attribute(deprecated) \ 281 || PCAP_IS_AT_LEAST_GNUC_VERSION(4,5) \ 282 || PCAP_IS_AT_LEAST_SUNC_VERSION(5,13) 283 /* 284 * Compiler that supports __has_attribute and __attribute__((deprecated)), 285 * or GCC 4.5 or later, or Sun/Oracle C 12.4 (Sun C 5.13) or later. 286 * 287 * Those support __attribute__((deprecated(msg))) (we assume, perhaps 288 * incorrectly, that anything that supports __has_attribute() is 289 * recent enough to support __attribute__((deprecated(msg)))). 290 */ 291 #define PCAP_DEPRECATED(func, msg) __attribute__((deprecated(msg))) 292 #elif PCAP_IS_AT_LEAST_GNUC_VERSION(3,1) 293 /* 294 * GCC 3.1 through 4.4. 295 * 296 * Those support __attribute__((deprecated)) but not 297 * __attribute__((deprecated(msg))). 298 */ 299 #define PCAP_DEPRECATED(func, msg) __attribute__((deprecated)) 300 #elif defined(_MSC_VER) && !defined(BUILDING_PCAP) 301 /* 302 * MSVC, and we're not building libpcap itself; it's VS 2015 303 * or later, so we have the deprecated pragma. 304 * 305 * If we *are* building libpcap, we don't want this, as it'll warn 306 * us even if we *define* the function. 307 */ 308 #define PCAP_DEPRECATED(func, msg) __pragma(deprecated(func)) 309 #else 310 #define PCAP_DEPRECATED(func, msg) 311 #endif 312 313 /* 314 * For flagging arguments as format strings in MSVC. 315 */ 316 #ifdef _MSC_VER 317 #include <sal.h> 318 #define PCAP_FORMAT_STRING(p) _Printf_format_string_ p 319 #else 320 #define PCAP_FORMAT_STRING(p) p 321 #endif 322 323 #endif /* lib_pcap_funcattrs_h */ 324