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);
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