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 #if CFG_TOYBOX_DEBUG 15 #define printf_format __attribute__((format(printf, 1, 2))) 16 #else 17 #define printf_format 18 #endif 19 #else 20 #define noreturn 21 #define printf_format 22 #endif 23 24 // Always use long file support. 25 #define _FILE_OFFSET_BITS 64 26 27 // This isn't in the spec, but it's how we determine what libc we're using. 28 29 #include <features.h> 30 31 // Types various replacement prototypes need 32 #include <sys/types.h> 33 34 // Various constants old build environments might not have even if kernel does 35 36 #ifndef AT_FDCWD 37 #define AT_FDCWD -100 38 #endif 39 40 #ifndef AT_SYMLINK_NOFOLLOW 41 #define AT_SYMLINK_NOFOLLOW 0x100 42 #endif 43 44 #ifndef AT_REMOVEDIR 45 #define AT_REMOVEDIR 0x200 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 #ifndef __GLIBC__ 158 // POSIX basename. 159 #include <libgen.h> 160 #endif 161 162 // Work out how to do endianness 163 164 #ifndef __APPLE__ 165 #include <byteswap.h> 166 #include <endian.h> 167 168 #if __BYTE_ORDER == __BIG_ENDIAN 169 #define IS_BIG_ENDIAN 1 170 #else 171 #define IS_BIG_ENDIAN 0 172 #endif 173 174 int clearenv(void); 175 #else 176 177 #ifdef __BIG_ENDIAN__ 178 #define IS_BIG_ENDIAN 1 179 #else 180 #define IS_BIG_ENDIAN 0 181 #endif 182 183 #endif 184 185 #if IS_BIG_ENDIAN 186 #define IS_LITTLE_ENDIAN 0 187 #define SWAP_BE16(x) (x) 188 #define SWAP_BE32(x) (x) 189 #define SWAP_BE64(x) (x) 190 #define SWAP_LE16(x) bswap_16(x) 191 #define SWAP_LE32(x) bswap_32(x) 192 #define SWAP_LE64(x) bswap_64(x) 193 #else 194 #define IS_LITTLE_ENDIAN 1 195 #define SWAP_BE16(x) bswap_16(x) 196 #define SWAP_BE32(x) bswap_32(x) 197 #define SWAP_BE64(x) bswap_64(x) 198 #define SWAP_LE16(x) (x) 199 #define SWAP_LE32(x) (x) 200 #define SWAP_LE64(x) (x) 201 #endif 202 203 #if defined(__APPLE__) \ 204 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10) 205 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 206 ssize_t getline(char **lineptr, size_t *n, FILE *stream); 207 #endif 208 209 // Linux headers not listed by POSIX or LSB 210 #include <sys/mount.h> 211 #include <sys/swap.h> 212 213 // Android is missing some headers and functions 214 // "generated/config.h" is included first 215 #if CFG_TOYBOX_SHADOW 216 #include <shadow.h> 217 #endif 218 #if CFG_TOYBOX_UTMPX 219 #include <utmpx.h> 220 #endif 221 222 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... 223 #include <fcntl.h> 224 #ifndef O_NOFOLLOW 225 #define O_NOFOLLOW 0 226 #endif 227 228 #ifndef O_CLOEXEC 229 #define O_CLOEXEC 02000000 230 #endif 231 232 #ifndef O_PATH 233 #define O_PATH 010000000 234 #endif 235 236 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ 237 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ 238 typedef double FLOAT; 239 #else 240 typedef float FLOAT; 241 #endif 242 243 #ifndef __uClinux__ 244 pid_t xfork(void); 245 #endif 246 247 //#define strncpy(...) @@strncpyisbadmmkay@@ 248 //#define strncat(...) @@strncatisbadmmkay@@ 249 250 #if CFG_TOYBOX_SELINUX 251 #include <selinux/selinux.h> 252 #else 253 #define is_selinux_enabled() 0 254 int getcon(void* con); 255 #endif 256 257 #if CFG_TOYBOX_SMACK 258 #include <sys/smack.h> 259 #include <sys/xattr.h> 260 #include <linux/xattr.h> 261 #else 262 #define smack_new_label_from_path(...) (-1) 263 #define smack_set_label_for_path(...) (-1) 264 #define smack_set_label_for_self(...) (-1) 265 #define XATTR_NAME_SMACK "" 266 #define SMACK_LABEL_LEN (1) /* for just ? */ 267 268 ssize_t fgetxattr (int fd, char *name, void *value, size_t size); 269 #endif 270 271
