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