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 // Test for gcc (using compiler builtin #define) 11 12 #ifdef __GNUC__ 13 #define noreturn __attribute__((noreturn)) 14 #define printf_format __attribute__((format(printf, 1, 2))) 15 #else 16 #define noreturn 17 #define printf_format 18 #endif 19 20 // Always use long file support. 21 #define _FILE_OFFSET_BITS 64 22 23 // This isn't in the spec, but it's how we determine what libc we're using. 24 25 #include <features.h> 26 27 // Types various replacement prototypes need 28 #include <sys/types.h> 29 30 // Various constants old build environments might not have even if kernel does 31 32 #ifndef AT_FDCWD 33 #define AT_FDCWD -100 34 #endif 35 36 #ifndef AT_SYMLINK_NOFOLLOW 37 #define AT_SYMLINK_NOFOLLOW 0x100 38 #endif 39 40 #ifndef AT_REMOVEDIR 41 #define AT_REMOVEDIR 0x200 42 #endif 43 44 #ifndef RLIMIT_RTTIME 45 #define RLIMIT_RTTIME 15 46 #endif 47 48 #ifndef SEEK_DATA 49 #define SEEK_DATA 3 50 #endif 51 52 // We don't define GNU_dammit because we're not part of the gnu project, and 53 // don't want to get any FSF on us. Unfortunately glibc (gnu libc) 54 // won't give us Linux syscall wrappers without claiming to be part of the 55 // gnu project (because Stallman's "GNU owns Linux" revisionist history 56 // crusade includes the kernel, even though Linux was inspired by Minix). 57 58 // We use most non-posix Linux syscalls directly through the syscall() wrapper, 59 // but even many posix-2008 functions aren't provided by glibc unless you 60 // claim it's in the name of Gnu. 61 62 #if defined(__GLIBC__) 63 // "Function prototypes shall be provided." but aren't. 64 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html 65 char *crypt(const char *key, const char *salt); 66 67 // According to posix, #include header, get a function definition. But glibc... 68 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html 69 #include <wchar.h> 70 int wcwidth(wchar_t wc); 71 72 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html 73 #include <time.h> 74 char *strptime(const char *buf, const char *format, struct tm *tm); 75 76 // They didn't like posix basename so they defined another function with the 77 // same name and if you include libgen.h it #defines basename to something 78 // else (where they implemented the real basename), and that define breaks 79 // the table entry for the basename command. They didn't make a new function 80 // with a different name for their new behavior because gnu. 81 // 82 // Solution: don't use their broken header, provide an inline to redirect the 83 // correct name to the broken name. 84 85 char *dirname(char *path); 86 char *__xpg_basename(char *path); 87 static inline char *basename(char *path) { return __xpg_basename(path); } 88 89 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more 90 #if defined(__UCLIBC__) 91 #include <unistd.h> 92 #include <stdio.h> 93 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 94 char *stpcpy(char *dest, const char *src); 95 pid_t getsid(pid_t pid); 96 97 // uClibc's last-ever release was in 2012, so of course it doesn't define 98 // any flag newer than MS_MOVE, which was added in 2001 (linux 2.5.0.5), 99 // eleven years earlier. 100 101 #include <sys/mount.h> 102 #ifndef MS_MOVE 103 #define MS_MOVE (1<<13) 104 #endif 105 #ifndef MS_REC 106 #define MS_REC (1<<14) 107 #endif 108 #ifndef MS_SILENT 109 #define MS_SILENT (1<<15) 110 #endif 111 #ifndef MS_UNBINDABLE 112 #define MS_UNBINDABLE (1<<17) 113 #endif 114 #ifndef MS_PRIVATE 115 #define MS_PRIVATE (1<<18) 116 #endif 117 #ifndef MS_SLAVE 118 #define MS_SLAVE (1<<19) 119 #endif 120 #ifndef MS_SHARED 121 #define MS_SHARED (1<<20) 122 #endif 123 #ifndef MS_RELATIME 124 #define MS_RELATIME (1<<21) 125 #endif 126 127 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit. 128 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10 129 #define fstatat fstatat64 130 int fstatat64(int dirfd, const char *pathname, void *buf, int flags); 131 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz); 132 char *stpcpy(char *dest, const char *src); 133 #include <sys/stat.h> 134 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags); 135 int openat(int dirfd, const char *pathname, int flags, ...); 136 #include <dirent.h> 137 DIR *fdopendir(int fd); 138 #include <unistd.h> 139 int fchownat(int dirfd, const char *pathname, 140 uid_t owner, gid_t group, int flags); 141 int isblank(int c); 142 int unlinkat(int dirfd, const char *pathname, int flags); 143 #include <stdio.h> 144 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 145 146 // Straight from posix-2008, things old glibc had but didn't prototype 147 148 int faccessat(int fd, const char *path, int amode, int flag); 149 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag); 150 int mkdirat(int fd, const char *path, mode_t mode); 151 int symlinkat(const char *path1, int fd, const char *path2); 152 int mknodat(int fd, const char *path, mode_t mode, dev_t dev); 153 #include <sys/time.h> 154 int futimens(int fd, const struct timespec times[2]); 155 int utimensat(int fd, const char *path, const struct timespec times[2], int flag); 156 157 #ifndef MNT_DETACH 158 #define MNT_DETACH 2 159 #endif 160 #endif // Old glibc 161 162 #endif // glibc in general 163 164 #if !defined(__GLIBC__) 165 // POSIX basename. 166 #include <libgen.h> 167 #endif 168 169 // Work out how to do endianness 170 171 #ifndef __APPLE__ 172 #include <byteswap.h> 173 #include <endian.h> 174 175 #if __BYTE_ORDER == __BIG_ENDIAN 176 #define IS_BIG_ENDIAN 1 177 #else 178 #define IS_BIG_ENDIAN 0 179 #endif 180 181 int clearenv(void); 182 #else 183 184 #ifdef __BIG_ENDIAN__ 185 #define IS_BIG_ENDIAN 1 186 #else 187 #define IS_BIG_ENDIAN 0 188 #endif 189 190 #endif 191 192 #if IS_BIG_ENDIAN 193 #define IS_LITTLE_ENDIAN 0 194 #define SWAP_BE16(x) (x) 195 #define SWAP_BE32(x) (x) 196 #define SWAP_BE64(x) (x) 197 #define SWAP_LE16(x) bswap_16(x) 198 #define SWAP_LE32(x) bswap_32(x) 199 #define SWAP_LE64(x) bswap_64(x) 200 #else 201 #define IS_LITTLE_ENDIAN 1 202 #define SWAP_BE16(x) bswap_16(x) 203 #define SWAP_BE32(x) bswap_32(x) 204 #define SWAP_BE64(x) bswap_64(x) 205 #define SWAP_LE16(x) (x) 206 #define SWAP_LE32(x) (x) 207 #define SWAP_LE64(x) (x) 208 #endif 209 210 #if defined(__APPLE__) \ 211 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10) 212 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 213 ssize_t getline(char **lineptr, size_t *n, FILE *stream); 214 #endif 215 216 // Linux headers not listed by POSIX or LSB 217 #include <sys/mount.h> 218 #include <sys/swap.h> 219 220 // Android is missing some headers and functions 221 // "generated/config.h" is included first 222 #if CFG_TOYBOX_SHADOW 223 #include <shadow.h> 224 #endif 225 #if CFG_TOYBOX_UTMPX 226 #include <utmpx.h> 227 #else 228 struct utmpx {int ut_type;}; 229 #define USER_PROCESS 0 230 static inline struct utmpx *getutxent(void) {return 0;} 231 static inline void setutxent(void) {;} 232 static inline void endutxent(void) {;} 233 #endif 234 235 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... 236 #include <fcntl.h> 237 #ifndef O_NOFOLLOW 238 #define O_NOFOLLOW 0 239 #endif 240 241 #ifndef O_NOATIME 242 #define O_NOATIME 01000000 243 #endif 244 245 #ifndef O_CLOEXEC 246 #define O_CLOEXEC 02000000 247 #endif 248 249 #ifndef O_PATH 250 #define O_PATH 010000000 251 #endif 252 253 // Glibc won't give you linux-kernel constants unless you say "no, a BUD lite" 254 // even though linux has nothing to do with the FSF and never has. 255 #ifndef F_SETPIPE_SZ 256 #define F_SETPIPE_SZ 1031 257 #endif 258 259 #ifndef F_GETPIPE_SZ 260 #define F_GETPIPE_SZ 1032 261 #endif 262 263 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ 264 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ 265 typedef double FLOAT; 266 #else 267 typedef float FLOAT; 268 #endif 269 270 #ifndef __uClinux__ 271 pid_t xfork(void); 272 #endif 273 274 //#define strncpy(...) @@strncpyisbadmmkay@@ 275 //#define strncat(...) @@strncatisbadmmkay@@ 276 277 #ifdef __ANDROID__ 278 #include <cutils/sched_policy.h> 279 #else 280 static inline int get_sched_policy(int tid, void *policy) {return 0;} 281 static inline char *get_sched_policy_name(int policy) {return "unknown";} 282 #endif 283
