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);
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
getutxent(void)202 static inline struct utmpx *getutxent(void) {return 0;}
setutxent(void)203 static inline void setutxent(void) {;}
endutxent(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;
__android_log_write(int pri,const char * tag,const char * msg)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
__system_property_set(const char * key,const char * value)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
get_sched_policy(int tid,void * policy)281 static inline int get_sched_policy(int tid, void *policy) {return 0;}
get_sched_policy_name(int policy)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>
confstr(int a,char * b,int c)307 static inline void confstr(int a, char *b, int c) {strcpy(b, a ? "POSIXLY_CORRECT=1" : "/bin:/usr/bin");}
308 #endif
309