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 // Introduced in Linux 3.1 49 #ifndef SEEK_DATA 50 #define SEEK_DATA 3 51 #endif 52 #ifndef SEEK_HOLE 53 #define SEEK_HOLE 4 54 #endif 55 56 // We don't define GNU_dammit because we're not part of the gnu project, and 57 // don't want to get any FSF on us. Unfortunately glibc (gnu libc) 58 // won't give us Linux syscall wrappers without claiming to be part of the 59 // gnu project (because Stallman's "GNU owns Linux" revisionist history 60 // crusade includes the kernel, even though Linux was inspired by Minix). 61 62 // We use most non-posix Linux syscalls directly through the syscall() wrapper, 63 // but even many posix-2008 functions aren't provided by glibc unless you 64 // claim it's in the name of Gnu. 65 66 #if defined(__GLIBC__) 67 // "Function prototypes shall be provided." but aren't. 68 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html 69 char *crypt(const char *key, const char *salt); 70 71 // According to posix, #include header, get a function definition. But glibc... 72 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html 73 #include <wchar.h> 74 int wcwidth(wchar_t wc); 75 76 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html 77 #include <time.h> 78 char *strptime(const char *buf, const char *format, struct tm *tm); 79 80 // They didn't like posix basename so they defined another function with the 81 // same name and if you include libgen.h it #defines basename to something 82 // else (where they implemented the real basename), and that define breaks 83 // the table entry for the basename command. They didn't make a new function 84 // with a different name for their new behavior because gnu. 85 // 86 // Solution: don't use their broken header, provide an inline to redirect the 87 // correct name to the broken name. 88 89 char *dirname(char *path); 90 char *__xpg_basename(char *path); 91 static inline char *basename(char *path) { return __xpg_basename(path); } 92 93 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit. 94 #if __GLIBC__ == 2 && __GLIBC_MINOR__ < 10 95 #define fstatat fstatat64 96 int fstatat64(int dirfd, const char *pathname, void *buf, int flags); 97 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz); 98 char *stpcpy(char *dest, const char *src); 99 #include <sys/stat.h> 100 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags); 101 int openat(int dirfd, const char *pathname, int flags, ...); 102 #include <dirent.h> 103 DIR *fdopendir(int fd); 104 #include <unistd.h> 105 int fchownat(int dirfd, const char *pathname, 106 uid_t owner, gid_t group, int flags); 107 int isblank(int c); 108 int unlinkat(int dirfd, const char *pathname, int flags); 109 #include <stdio.h> 110 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 111 112 // Straight from posix-2008, things old glibc had but didn't prototype 113 114 int faccessat(int fd, const char *path, int amode, int flag); 115 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag); 116 int mkdirat(int fd, const char *path, mode_t mode); 117 int symlinkat(const char *path1, int fd, const char *path2); 118 int mknodat(int fd, const char *path, mode_t mode, dev_t dev); 119 #include <sys/time.h> 120 int futimens(int fd, const struct timespec times[2]); 121 int utimensat(int fd, const char *path, const struct timespec times[2], int flag); 122 123 #ifndef MNT_DETACH 124 #define MNT_DETACH 2 125 #endif 126 #endif // Old glibc 127 128 #endif // glibc in general 129 130 #if !defined(__GLIBC__) 131 // POSIX basename. 132 #include <libgen.h> 133 #endif 134 135 // Work out how to do endianness 136 137 #ifndef __APPLE__ 138 #include <byteswap.h> 139 #include <endian.h> 140 141 #if __BYTE_ORDER == __BIG_ENDIAN 142 #define IS_BIG_ENDIAN 1 143 #else 144 #define IS_BIG_ENDIAN 0 145 #endif 146 147 int clearenv(void); 148 #else 149 150 #ifdef __BIG_ENDIAN__ 151 #define IS_BIG_ENDIAN 1 152 #else 153 #define IS_BIG_ENDIAN 0 154 #endif 155 156 #endif 157 158 #if IS_BIG_ENDIAN 159 #define IS_LITTLE_ENDIAN 0 160 #define SWAP_BE16(x) (x) 161 #define SWAP_BE32(x) (x) 162 #define SWAP_BE64(x) (x) 163 #define SWAP_LE16(x) bswap_16(x) 164 #define SWAP_LE32(x) bswap_32(x) 165 #define SWAP_LE64(x) bswap_64(x) 166 #else 167 #define IS_LITTLE_ENDIAN 1 168 #define SWAP_BE16(x) bswap_16(x) 169 #define SWAP_BE32(x) bswap_32(x) 170 #define SWAP_BE64(x) bswap_64(x) 171 #define SWAP_LE16(x) (x) 172 #define SWAP_LE32(x) (x) 173 #define SWAP_LE64(x) (x) 174 #endif 175 176 #if defined(__APPLE__) \ 177 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10) 178 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); 179 ssize_t getline(char **lineptr, size_t *n, FILE *stream); 180 #endif 181 182 // Linux headers not listed by POSIX or LSB 183 #include <sys/mount.h> 184 #include <sys/swap.h> 185 186 // Android is missing some headers and functions 187 // "generated/config.h" is included first 188 #if CFG_TOYBOX_SHADOW 189 #include <shadow.h> 190 #endif 191 #if CFG_TOYBOX_UTMPX 192 #include <utmpx.h> 193 #else 194 struct utmpx {int ut_type;}; 195 #define USER_PROCESS 0 196 static inline struct utmpx *getutxent(void) {return 0;} 197 static inline void setutxent(void) {;} 198 static inline void endutxent(void) {;} 199 #endif 200 201 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... 202 #include <fcntl.h> 203 #ifndef O_NOFOLLOW 204 #define O_NOFOLLOW 0 205 #endif 206 #ifndef O_NOATIME 207 #define O_NOATIME 01000000 208 #endif 209 #ifndef O_CLOEXEC 210 #define O_CLOEXEC 02000000 211 #endif 212 #ifndef O_PATH 213 #define O_PATH 010000000 214 #endif 215 #ifndef SCHED_RESET_ON_FORK 216 #define SCHED_RESET_ON_FORK (1<<30) 217 #endif 218 219 // Glibc won't give you linux-kernel constants unless you say "no, a BUD lite" 220 // even though linux has nothing to do with the FSF and never has. 221 #ifndef F_SETPIPE_SZ 222 #define F_SETPIPE_SZ 1031 223 #endif 224 225 #ifndef F_GETPIPE_SZ 226 #define F_GETPIPE_SZ 1032 227 #endif 228 229 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ 230 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ 231 typedef double FLOAT; 232 #else 233 typedef float FLOAT; 234 #endif 235 236 #ifndef __uClinux__ 237 pid_t xfork(void); 238 #endif 239 240 //#define strncpy(...) @@strncpyisbadmmkay@@ 241 //#define strncat(...) @@strncatisbadmmkay@@ 242 243 #if CFG_TOYBOX_ANDROID_SCHEDPOLICY && defined(__BIONIC__) 244 #include <cutils/sched_policy.h> 245 #else 246 static inline int get_sched_policy(int tid, void *policy) {return 0;} 247 static inline char *get_sched_policy_name(int policy) {return "unknown";} 248 #endif 249 250 #ifndef SYSLOG_NAMES 251 typedef struct {char *c_name; int c_val;} CODE; 252 extern CODE prioritynames[], facilitynames[]; 253 #endif 254
