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