1 // Workarounds for horrible build environment idiosyncrasies. 2 3 // Instead of polluting the code with strange #ifdefs to work around bugs 4 // in specific compiler, library, or OS versions, localize all that here 5 // and in portability.c 6 7 // For musl 8 #define _ALL_SOURCE 9 10 #ifdef __APPLE__ 11 // macOS 10.13 doesn't have the POSIX 2008 direct access to timespec in 12 // struct stat, but we can ask it to give us something equivalent... 13 // (This must come before any #include!) 14 #define _DARWIN_C_SOURCE 15 // ...and then use macros to paper over the difference. 16 #define st_atim st_atimespec 17 #define st_ctim st_ctimespec 18 #define st_mtim st_mtimespec 19 #endif 20 21 // Test for gcc (using compiler builtin #define) 22 23 #ifdef __GNUC__ 24 #define printf_format __attribute__((format(printf, 1, 2))) 25 #else 26 #define printf_format 27 #endif 28 29 // Always use long file support. 30 #define _FILE_OFFSET_BITS 64 31 32 // This isn't in the spec, but it's how we determine what libc we're using. 33 34 // Types various replacement prototypes need. 35 // This also lets us determine what libc we're using. Systems that 36 // have <features.h> will transitively include it, and ones that don't -- 37 // macOS -- won't break. 38 #include <sys/types.h> 39 40 // Various constants old build environments might not have even if kernel does 41 42 #ifndef AT_FDCWD 43 #define AT_FDCWD -100 44 #endif 45 46 #ifndef AT_SYMLINK_NOFOLLOW 47 #define AT_SYMLINK_NOFOLLOW 0x100 48 #endif 49 50 #ifndef AT_REMOVEDIR 51 #define AT_REMOVEDIR 0x200 52 #endif 53 54 #ifndef RLIMIT_RTTIME 55 #define RLIMIT_RTTIME 15 56 #endif 57 58 // Introduced in Linux 3.1 59 #ifndef SEEK_DATA 60 #define SEEK_DATA 3 61 #endif 62 #ifndef SEEK_HOLE 63 #define SEEK_HOLE 4 64 #endif 65 66 // We don't define GNU_dammit because we're not part of the gnu project, and 67 // don't want to get any FSF on us. Unfortunately glibc (gnu libc) 68 // won't give us Linux syscall wrappers without claiming to be part of the 69 // gnu project (because Stallman's "GNU owns Linux" revisionist history 70 // crusade includes the kernel, even though Linux was inspired by Minix). 71 72 // We use most non-posix Linux syscalls directly through the syscall() wrapper, 73 // but even many posix-2008 functions aren't provided by glibc unless you 74 // claim it's in the name of Gnu. 75 76 #if defined(__GLIBC__) 77 // "Function prototypes shall be provided." but aren't. 78 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html 79 char *crypt(const char *key, const char *salt); 80 81 // According to posix, #include header, get a function definition. But glibc... 82 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html 83 #include <wchar.h> 84 int wcwidth(wchar_t wc); 85 86 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html 87 #include <time.h> 88 char *strptime(const char *buf, const char *format, struct tm *tm); 89 90 // They didn't like posix basename so they defined another function with the 91 // same name and if you include libgen.h it #defines basename to something 92 // else (where they implemented the real basename), and that define breaks 93 // the table entry for the basename command. They didn't make a new function 94 // with a different name for their new behavior because gnu. 95 // 96 // Solution: don't use their broken header, provide an inline to redirect the 97 // correct name to the broken name. 98 99 char *dirname(char *path); 100 char *__xpg_basename(char *path); 101 static inline char *basename(char *path) { return __xpg_basename(path); } 102 char *strcasestr(const char *haystack, const char *needle); 103 #endif // defined(glibc) 104 105 #if !defined(__GLIBC__) 106 // POSIX basename. 107 #include <libgen.h> 108 #endif 109 110 // Work out how to do endianness 111 112 #ifdef __APPLE__ 113 114 #include <libkern/OSByteOrder.h> 115 116 #ifdef __BIG_ENDIAN__ 117 #define IS_BIG_ENDIAN 1 118 #else 119 #define IS_BIG_ENDIAN 0 120 #endif 121 122 #define bswap_16(x) OSSwapInt16(x) 123 #define bswap_32(x) OSSwapInt32(x) 124 #define bswap_64(x) OSSwapInt64(x) 125 126 int clearenv(void); 127 128 #elif defined(__FreeBSD__) 129 130 #include <sys/endian.h> 131 132 #if _BYTE_ORDER == _BIG_ENDIAN 133 #define IS_BIG_ENDIAN 1 134 #else 135 #define IS_BIG_ENDIAN 0 136 #endif 137 138 #else 139 140 #include <byteswap.h> 141 #include <endian.h> 142 143 #if __BYTE_ORDER == __BIG_ENDIAN 144 #define IS_BIG_ENDIAN 1 145 #else 146 #define IS_BIG_ENDIAN 0 147 #endif 148 149 #endif 150 151 #if IS_BIG_ENDIAN 152 #define IS_LITTLE_ENDIAN 0 153 #define SWAP_BE16(x) (x) 154 #define SWAP_BE32(x) (x) 155 #define SWAP_BE64(x) (x) 156 #define SWAP_LE16(x) bswap_16(x) 157 #define SWAP_LE32(x) bswap_32(x) 158 #define SWAP_LE64(x) bswap_64(x) 159 #else 160 #define IS_LITTLE_ENDIAN 1 161 #define SWAP_BE16(x) bswap_16(x) 162 #define SWAP_BE32(x) bswap_32(x) 163 #define SWAP_BE64(x) bswap_64(x) 164 #define SWAP_LE16(x) (x) 165 #define SWAP_LE32(x) (x) 166 #define SWAP_LE64(x) (x) 167 #endif 168 169 // Linux headers not listed by POSIX or LSB 170 #include <sys/mount.h> 171 #ifdef __linux__ 172 #include <sys/statfs.h> 173 #include <sys/swap.h> 174 #include <sys/sysinfo.h> 175 #endif 176 177 #ifdef __APPLE__ 178 #include <util.h> 179 #elif !defined(__FreeBSD__) 180 #include <pty.h> 181 #else 182 #include <termios.h> 183 #ifndef IUTF8 184 #define IUTF8 0 185 #endif 186 #endif 187 188 #ifndef __FreeBSD__ 189 #include <sys/xattr.h> 190 #endif 191 192 // Android is missing some headers and functions 193 // "generated/config.h" is included first 194 #if CFG_TOYBOX_SHADOW 195 #include <shadow.h> 196 #endif 197 #if CFG_TOYBOX_UTMPX 198 #include <utmpx.h> 199 #else 200 struct utmpx {int ut_type;}; 201 #define USER_PROCESS 0 202 static inline struct utmpx *getutxent(void) {return 0;} 203 static inline void setutxent(void) {;} 204 static inline void endutxent(void) {;} 205 #endif 206 207 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... 208 #include <fcntl.h> 209 #ifndef O_NOFOLLOW 210 #define O_NOFOLLOW 0 211 #endif 212 #ifndef O_NOATIME 213 #define O_NOATIME 01000000 214 #endif 215 #ifndef O_CLOEXEC 216 #define O_CLOEXEC 02000000 217 #endif 218 #ifndef O_PATH 219 #define O_PATH 010000000 220 #endif 221 #ifndef SCHED_RESET_ON_FORK 222 #define SCHED_RESET_ON_FORK (1<<30) 223 #endif 224 225 // Glibc won't give you linux-kernel constants unless you say "no, a BUD lite" 226 // even though linux has nothing to do with the FSF and never has. 227 #ifndef F_SETPIPE_SZ 228 #define F_SETPIPE_SZ 1031 229 #endif 230 231 #ifndef F_GETPIPE_SZ 232 #define F_GETPIPE_SZ 1032 233 #endif 234 235 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ 236 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ 237 typedef double FLOAT; 238 #else 239 typedef float FLOAT; 240 #endif 241 242 #ifndef __uClinux__ 243 pid_t xfork(void); 244 #endif 245 246 //#define strncpy(...) @@strncpyisbadmmkay@@ 247 //#define strncat(...) @@strncatisbadmmkay@@ 248 249 // Support building the Android tools on glibc, so hermetic AOSP builds can 250 // use toybox before they're ready to switch to host bionic. 251 #ifdef __BIONIC__ 252 #include <android/log.h> 253 #include <sys/system_properties.h> 254 #else 255 typedef enum android_LogPriority { 256 ANDROID_LOG_UNKNOWN = 0, 257 ANDROID_LOG_DEFAULT, 258 ANDROID_LOG_VERBOSE, 259 ANDROID_LOG_DEBUG, 260 ANDROID_LOG_INFO, 261 ANDROID_LOG_WARN, 262 ANDROID_LOG_ERROR, 263 ANDROID_LOG_FATAL, 264 ANDROID_LOG_SILENT, 265 } android_LogPriority; 266 static inline int __android_log_write(int pri, const char *tag, const char *msg) 267 { 268 return -1; 269 } 270 #define PROP_VALUE_MAX 92 271 static inline int __system_property_set(const char *key, const char *value) 272 { 273 return -1; 274 } 275 #endif 276 277 // libcutils is in AOSP but not Android NDK r18 278 #if defined(__BIONIC__) && !defined(__ANDROID_NDK__) 279 #include <cutils/sched_policy.h> 280 #else 281 static inline int get_sched_policy(int tid, void *policy) {return 0;} 282 static inline char *get_sched_policy_name(int policy) {return "unknown";} 283 #endif 284 285 // Android NDKv18 has liblog.so but not liblog.c for static builds, 286 // stub it out for now. 287 #ifdef __ANDROID_NDK__ 288 #define __android_log_write(a, b, c) (0) 289 #define adjtime(x, y) (0) 290 #endif 291 292 #ifndef SYSLOG_NAMES 293 typedef struct {char *c_name; int c_val;} CODE; 294 extern CODE prioritynames[], facilitynames[]; 295 #endif 296 297 #if CFG_TOYBOX_GETRANDOM 298 #include <sys/random.h> 299 #endif 300 int xgetrandom(void *buf, unsigned len, unsigned flags); 301 302 // Android's bionic libc doesn't have confstr. 303 #ifdef __BIONIC__ 304 #define _CS_PATH 0 305 #define _CS_V7_ENV 1 306 #include <string.h> 307 static inline void confstr(int a, char *b, int c) {strcpy(b, a ? "POSIXLY_CORRECT=1" : "/bin:/usr/bin");} 308 #endif 309
