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 #ifndef REG_STARTEND
10 #define REG_STARTEND 0
11 #endif
12
13 #ifdef __APPLE__
14 // macOS 10.13 doesn't have the POSIX 2008 direct access to timespec in
15 // struct stat, but we can ask it to give us something equivalent...
16 // (This must come before any #include!)
17 #define _DARWIN_C_SOURCE
18 // ...and then use macros to paper over the difference.
19 #define st_atim st_atimespec
20 #define st_ctim st_ctimespec
21 #define st_mtim st_mtimespec
22 #endif
23
24 // Test for gcc (using compiler builtin #define)
25
26 #ifdef __GNUC__
27 #ifndef __clang__
28 #define QUIET = 0 // shut up false positive "may be used uninitialized" warning
29 #else
30 #define QUIET
31 #endif
32 #define printf_format __attribute__((format(printf, 1, 2)))
33 #else
34 #define printf_format
35 #endif
36
37 // Always use long file support.
38 #define _FILE_OFFSET_BITS 64
39
40 // This isn't in the spec, but it's how we determine what libc we're using.
41
42 // Types various replacement prototypes need.
43 // This also lets us determine what libc we're using. Systems that
44 // have <features.h> will transitively include it, and ones that don't --
45 // macOS -- won't break.
46 #include <sys/types.h>
47
48 // Various constants old build environments might not have even if kernel does
49
50 #ifndef AT_FDCWD
51 #define AT_FDCWD -100
52 #endif
53
54 #ifndef AT_SYMLINK_NOFOLLOW
55 #define AT_SYMLINK_NOFOLLOW 0x100
56 #endif
57
58 #ifndef AT_REMOVEDIR
59 #define AT_REMOVEDIR 0x200
60 #endif
61
62 #ifndef RLIMIT_RTTIME
63 #define RLIMIT_RTTIME 15
64 #endif
65
66 // Introduced in Linux 3.1
67 #ifndef SEEK_DATA
68 #define SEEK_DATA 3
69 #endif
70 #ifndef SEEK_HOLE
71 #define SEEK_HOLE 4
72 #endif
73
74 // We don't define GNU_dammit because we're not part of the gnu project, and
75 // don't want to get any FSF on us. Unfortunately glibc (gnu libc)
76 // won't give us Linux syscall wrappers without claiming to be part of the
77 // gnu project (because Stallman's "GNU owns Linux" revisionist history
78 // crusade includes the kernel, even though Linux was inspired by Minix).
79
80 // We use most non-posix Linux syscalls directly through the syscall() wrapper,
81 // but even many posix-2008 functions aren't provided by glibc unless you
82 // claim it's in the name of Gnu.
83
84 #if defined(__GLIBC__)
85 // "Function prototypes shall be provided." but aren't.
86 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
87 char *crypt(const char *key, const char *salt);
88
89 // According to posix, #include header, get a function definition. But glibc...
90 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
91 #include <wchar.h>
92 int wcwidth(wchar_t wc);
93
94 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
95 #include <time.h>
96 char *strptime(const char *buf, const char *format, struct tm *tm);
97
98 // They didn't like posix basename so they defined another function with the
99 // same name and if you include libgen.h it #defines basename to something
100 // else (where they implemented the real basename), and that define breaks
101 // the table entry for the basename command. They didn't make a new function
102 // with a different name for their new behavior because gnu.
103 //
104 // Solution: don't use their broken header, provide an inline to redirect the
105 // correct name to the broken name.
106
107 char *dirname(char *path);
108 char *__xpg_basename(char *path);
basename(char * path)109 static inline char *basename(char *path) { return __xpg_basename(path); }
110 char *strcasestr(const char *haystack, const char *needle);
111 #endif // defined(glibc)
112
113 #if !defined(__GLIBC__)
114 // POSIX basename.
115 #include <libgen.h>
116 #endif
117
118 // Work out how to do endianness
119
120 #ifdef __APPLE__
121
122 #include <libkern/OSByteOrder.h>
123
124 #ifdef __BIG_ENDIAN__
125 #define IS_BIG_ENDIAN 1
126 #else
127 #define IS_BIG_ENDIAN 0
128 #endif
129
130 #define bswap_16(x) OSSwapInt16(x)
131 #define bswap_32(x) OSSwapInt32(x)
132 #define bswap_64(x) OSSwapInt64(x)
133
134 #elif defined(__FreeBSD__)
135
136 #include <sys/endian.h>
137
138 #if _BYTE_ORDER == _BIG_ENDIAN
139 #define IS_BIG_ENDIAN 1
140 #else
141 #define IS_BIG_ENDIAN 0
142 #endif
143
144 #else
145
146 #include <byteswap.h>
147 #include <endian.h>
148
149 #if __BYTE_ORDER == __BIG_ENDIAN
150 #define IS_BIG_ENDIAN 1
151 #else
152 #define IS_BIG_ENDIAN 0
153 #endif
154
155 #endif
156
157 #if IS_BIG_ENDIAN
158 #define IS_LITTLE_ENDIAN 0
159 #define SWAP_BE16(x) (x)
160 #define SWAP_BE32(x) (x)
161 #define SWAP_BE64(x) (x)
162 #define SWAP_LE16(x) bswap_16(x)
163 #define SWAP_LE32(x) bswap_32(x)
164 #define SWAP_LE64(x) bswap_64(x)
165 #else
166 #define IS_LITTLE_ENDIAN 1
167 #define SWAP_BE16(x) bswap_16(x)
168 #define SWAP_BE32(x) bswap_32(x)
169 #define SWAP_BE64(x) bswap_64(x)
170 #define SWAP_LE16(x) (x)
171 #define SWAP_LE32(x) (x)
172 #define SWAP_LE64(x) (x)
173 #endif
174
175 // Linux headers not listed by POSIX or LSB
176 #include <sys/mount.h>
177 #ifdef __linux__
178 #include <sys/statfs.h>
179 #include <sys/swap.h>
180 #include <sys/sysinfo.h>
181 #endif
182
183 #ifdef __APPLE__
184 #include <util.h>
185 #elif !defined(__FreeBSD__)
186 #include <pty.h>
187 #else
188 #include <termios.h>
189 #ifndef IUTF8
190 #define IUTF8 0
191 #endif
192 #endif
193
194 #if defined(__APPLE__) || defined(__linux__)
195 // Linux and macOS has both have getxattr and friends in <sys/xattr.h>, but
196 // they aren't compatible.
197 #include <sys/xattr.h>
198 ssize_t xattr_get(const char *, const char *, void *, size_t);
199 ssize_t xattr_lget(const char *, const char *, void *, size_t);
200 ssize_t xattr_fget(int fd, const char *, void *, size_t);
201 ssize_t xattr_list(const char *, char *, size_t);
202 ssize_t xattr_llist(const char *, char *, size_t);
203 ssize_t xattr_flist(int, char *, size_t);
204 ssize_t xattr_set(const char*, const char*, const void*, size_t, int);
205 ssize_t xattr_lset(const char*, const char*, const void*, size_t, int);
206 ssize_t xattr_fset(int, const char*, const void*, size_t, int);
207 #endif
208
209 // macOS doesn't have mknodat, but we can fake it.
210 #ifdef __APPLE__
211 int mknodat(int, const char*, mode_t, dev_t);
212 #endif
213
214 // Android is missing some headers and functions
215 // "generated/config.h" is included first
216 #if CFG_TOYBOX_SHADOW
217 #include <shadow.h>
218 #endif
219 #if CFG_TOYBOX_UTMPX
220 #include <utmpx.h>
221 #else
222 struct utmpx {int ut_type;};
223 #define USER_PROCESS 0
getutxent(void)224 static inline struct utmpx *getutxent(void) {return 0;}
setutxent(void)225 static inline void setutxent(void) {;}
endutxent(void)226 static inline void endutxent(void) {;}
227 #endif
228
229 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
230 #include <fcntl.h>
231 #ifndef O_NOFOLLOW
232 #define O_NOFOLLOW 0
233 #endif
234 #ifndef O_NOATIME
235 #define O_NOATIME 01000000
236 #endif
237 #ifndef O_CLOEXEC
238 #define O_CLOEXEC 02000000
239 #endif
240 #ifndef O_PATH
241 #define O_PATH 010000000
242 #endif
243 #ifndef SCHED_RESET_ON_FORK
244 #define SCHED_RESET_ON_FORK (1<<30)
245 #endif
246
247 // Glibc won't give you linux-kernel constants unless you say "no, a BUD lite"
248 // even though linux has nothing to do with the FSF and never has.
249 #ifndef F_SETPIPE_SZ
250 #define F_SETPIPE_SZ 1031
251 #endif
252
253 #ifndef F_GETPIPE_SZ
254 #define F_GETPIPE_SZ 1032
255 #endif
256
257 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \
258 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__
259 typedef double FLOAT;
260 #else
261 typedef float FLOAT;
262 #endif
263
264 #ifndef __uClinux__
265 pid_t xfork(void);
266 #endif
267
268 //#define strncpy(...) @@strncpyisbadmmkay@@
269 //#define strncat(...) @@strncatisbadmmkay@@
270
271 // Support building the Android tools on glibc, so hermetic AOSP builds can
272 // use toybox before they're ready to switch to host bionic.
273 #ifdef __BIONIC__
274 #include <android/log.h>
275 #else
276 typedef enum android_LogPriority {
277 ANDROID_LOG_UNKNOWN = 0,
278 ANDROID_LOG_DEFAULT,
279 ANDROID_LOG_VERBOSE,
280 ANDROID_LOG_DEBUG,
281 ANDROID_LOG_INFO,
282 ANDROID_LOG_WARN,
283 ANDROID_LOG_ERROR,
284 ANDROID_LOG_FATAL,
285 ANDROID_LOG_SILENT,
286 } android_LogPriority;
__android_log_write(int pri,const char * tag,const char * msg)287 static inline int __android_log_write(int pri, const char *tag, const char *msg)
288 {
289 return -1;
290 }
291 #endif
292
293 // libprocessgroup is an Android platform library not included in the NDK.
294 #if defined(__BIONIC__) && __has_include(<processgroup/sched_policy.h>)
295 #include <processgroup/sched_policy.h>
296 #else
get_sched_policy(int tid,void * policy)297 static inline int get_sched_policy(int tid, void *policy) {return 0;}
get_sched_policy_name(int policy)298 static inline char *get_sched_policy_name(int policy) {return "unknown";}
299 #endif
300
301 // Android NDKv18 has liblog.so but not liblog.c for static builds,
302 // stub it out for now.
303 #ifdef __ANDROID_NDK__
304 #define __android_log_write(a, b, c) (0)
305 #define adjtime(x, y) (0)
306 #endif
307
308 #ifndef SYSLOG_NAMES
309 typedef struct {char *c_name; int c_val;} CODE;
310 extern CODE prioritynames[], facilitynames[];
311 #endif
312
313 #if CFG_TOYBOX_GETRANDOM
314 #include <sys/random.h>
315 #endif
316 int xgetrandom(void *buf, unsigned len, unsigned flags);
317
318 // Android's bionic libc doesn't have confstr.
319 #ifdef __BIONIC__
320 #define _CS_PATH 0
321 #define _CS_V7_ENV 1
322 #include <string.h>
confstr(int a,char * b,int c)323 static inline void confstr(int a, char *b, int c) {strcpy(b, a ? "POSIXLY_CORRECT=1" : "/bin:/usr/bin");}
324 #endif
325
326 // Paper over the differences between BSD kqueue and Linux inotify for tail.
327
328 struct xnotify {
329 char **paths;
330 int max, *fds, count, kq;
331 };
332
333 struct xnotify *xnotify_init(int max);
334 int xnotify_add(struct xnotify *not, int fd, char *path);
335 int xnotify_wait(struct xnotify *not, char **path);
336
337 #ifdef __APPLE__
338 #define f_frsize f_iosize
339 #endif
340
341 int sig_to_num(char *s);
342 char *num_to_sig(int sig);
343
344 struct signame {
345 int num;
346 char *name;
347 };
348 void xsignal_all_killers(void *handler);
349