1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _UNISTD_H_
30#define _UNISTD_H_
31
32#include <stddef.h>
33#include <sys/cdefs.h>
34#include <sys/types.h>
35#include <sys/select.h>
36#include <sys/sysconf.h>
37
38#include <machine/posix_limits.h>
39
40__BEGIN_DECLS
41
42#define STDIN_FILENO	0
43#define STDOUT_FILENO	1
44#define STDERR_FILENO	2
45
46#define F_OK 0
47#define X_OK 1
48#define W_OK 2
49#define R_OK 4
50
51#define SEEK_SET 0
52#define SEEK_CUR 1
53#define SEEK_END 2
54
55#define _PC_FILESIZEBITS 0
56#define _PC_LINK_MAX 1
57#define _PC_MAX_CANON 2
58#define _PC_MAX_INPUT 3
59#define _PC_NAME_MAX 4
60#define _PC_PATH_MAX 5
61#define _PC_PIPE_BUF 6
62#define _PC_2_SYMLINKS 7
63#define _PC_ALLOC_SIZE_MIN 8
64#define _PC_REC_INCR_XFER_SIZE 9
65#define _PC_REC_MAX_XFER_SIZE 10
66#define _PC_REC_MIN_XFER_SIZE 11
67#define _PC_REC_XFER_ALIGN 12
68#define _PC_SYMLINK_MAX 13
69#define _PC_CHOWN_RESTRICTED 14
70#define _PC_NO_TRUNC 15
71#define _PC_VDISABLE 16
72#define _PC_ASYNC_IO 17
73#define _PC_PRIO_IO 18
74#define _PC_SYNC_IO 19
75
76extern char** environ;
77
78extern __noreturn void _exit(int);
79
80extern pid_t  fork(void);
81extern pid_t  vfork(void);
82extern pid_t  getpid(void);
83extern pid_t  gettid(void) __pure2;
84extern pid_t  getpgid(pid_t);
85extern int    setpgid(pid_t, pid_t);
86extern pid_t  getppid(void);
87extern pid_t  getpgrp(void);
88extern int    setpgrp(void);
89extern pid_t  getsid(pid_t);
90extern pid_t  setsid(void);
91
92extern int execv(const char *, char * const *);
93extern int execvp(const char *, char * const *);
94extern int execvpe(const char *, char * const *, char * const *);
95extern int execve(const char *, char * const *, char * const *);
96extern int execl(const char *, const char *, ...);
97extern int execlp(const char *, const char *, ...);
98extern int execle(const char *, const char *, ...);
99
100extern int nice(int);
101
102extern int setuid(uid_t);
103extern uid_t getuid(void);
104extern int seteuid(uid_t);
105extern uid_t geteuid(void);
106extern int setgid(gid_t);
107extern gid_t getgid(void);
108extern int setegid(gid_t);
109extern gid_t getegid(void);
110extern int getgroups(int, gid_t *);
111extern int setgroups(size_t, const gid_t *);
112extern int setreuid(uid_t, uid_t);
113extern int setregid(gid_t, gid_t);
114extern int setresuid(uid_t, uid_t, uid_t);
115extern int setresgid(gid_t, gid_t, gid_t);
116extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
117extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
118extern char* getlogin(void);
119
120extern long fpathconf(int, int);
121extern long pathconf(const char*, int);
122
123extern int access(const char*, int);
124extern int faccessat(int, const char*, int, int);
125extern int link(const char*, const char*);
126extern int linkat(int, const char*, int, const char*, int);
127extern int unlink(const char*);
128extern int unlinkat(int, const char*, int);
129extern int chdir(const char *);
130extern int fchdir(int);
131extern int rmdir(const char *);
132extern int pipe(int *);
133#if defined(__USE_GNU)
134extern int pipe2(int *, int);
135#endif
136extern int chroot(const char *);
137extern int symlink(const char*, const char*);
138extern int symlinkat(const char*, int, const char*);
139extern ssize_t readlink(const char*, char*, size_t);
140extern ssize_t readlinkat(int, const char*, char*, size_t);
141extern int chown(const char *, uid_t, gid_t);
142extern int fchown(int, uid_t, gid_t);
143extern int fchownat(int, const char*, uid_t, gid_t, int);
144extern int lchown(const char *, uid_t, gid_t);
145extern char *getcwd(char *, size_t);
146
147extern int sync(void);
148
149extern int close(int);
150
151extern ssize_t read(int, void *, size_t);
152extern ssize_t write(int, const void *, size_t);
153
154extern int dup(int);
155extern int dup2(int, int);
156extern int dup3(int, int, int);
157extern int fcntl(int, int, ...);
158extern int ioctl(int, int, ...);
159extern int fsync(int);
160extern int fdatasync(int);
161
162#if defined(__USE_FILE_OFFSET64)
163extern int truncate(const char *, off_t) __RENAME(truncate64);
164extern off_t lseek(int, off_t, int) __RENAME(lseek64);
165extern ssize_t pread(int, void *, size_t, off_t) __RENAME(pread64);
166extern ssize_t pwrite(int, const void *, size_t, off_t) __RENAME(pwrite64);
167extern int ftruncate(int, off_t) __RENAME(ftruncate64);
168#else
169extern int truncate(const char *, off_t);
170extern off_t lseek(int, off_t, int);
171extern ssize_t pread(int, void *, size_t, off_t);
172extern ssize_t pwrite(int, const void *, size_t, off_t);
173extern int ftruncate(int, off_t);
174#endif
175extern int truncate64(const char *, off64_t);
176extern off64_t lseek64(int, off64_t, int);
177extern ssize_t pread64(int, void *, size_t, off64_t);
178extern ssize_t pwrite64(int, const void *, size_t, off64_t);
179extern int ftruncate64(int, off64_t);
180
181extern int pause(void);
182extern unsigned int alarm(unsigned int);
183extern unsigned int sleep(unsigned int);
184extern int usleep(useconds_t);
185
186int gethostname(char*, size_t);
187int sethostname(const char*, size_t);
188
189extern void *__brk(void *);
190extern int brk(void *);
191extern void *sbrk(ptrdiff_t);
192
193extern int getopt(int, char * const *, const char *);
194extern char *optarg;
195extern int optind, opterr, optopt;
196
197extern int isatty(int);
198extern char* ttyname(int);
199extern int ttyname_r(int, char*, size_t);
200
201extern int  acct(const char*  filepath);
202
203int getpagesize(void);
204
205long sysconf(int);
206
207long syscall(long number, ...);
208
209extern int daemon(int, int);
210
211#if defined(__arm__) || (defined(__mips__) && !defined(__LP64__))
212extern int cacheflush(long, long, long);
213    /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
214#endif
215
216extern pid_t tcgetpgrp(int fd);
217extern int   tcsetpgrp(int fd, pid_t _pid);
218
219/* Used to retry syscalls that can return EINTR. */
220#define TEMP_FAILURE_RETRY(exp) ({         \
221    __typeof__(exp) _rc;                   \
222    do {                                   \
223        _rc = (exp);                       \
224    } while (_rc == -1 && errno == EINTR); \
225    _rc; })
226
227extern ssize_t __pread_chk(int, void*, size_t, off_t, size_t);
228__errordecl(__pread_dest_size_error, "pread called with size bigger than destination");
229__errordecl(__pread_count_toobig_error, "pread called with count > SSIZE_MAX");
230extern ssize_t __pread_real(int, void*, size_t, off_t) __RENAME(pread);
231
232extern ssize_t __pread64_chk(int, void*, size_t, off64_t, size_t);
233__errordecl(__pread64_dest_size_error, "pread64 called with size bigger than destination");
234__errordecl(__pread64_count_toobig_error, "pread64 called with count > SSIZE_MAX");
235extern ssize_t __pread64_real(int, void*, size_t, off64_t) __RENAME(pread64);
236
237extern ssize_t __read_chk(int, void*, size_t, size_t);
238__errordecl(__read_dest_size_error, "read called with size bigger than destination");
239__errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX");
240extern ssize_t __read_real(int, void*, size_t) __RENAME(read);
241
242extern ssize_t __readlink_chk(const char*, char*, size_t, size_t);
243__errordecl(__readlink_dest_size_error, "readlink called with size bigger than destination");
244__errordecl(__readlink_size_toobig_error, "readlink called with size > SSIZE_MAX");
245extern ssize_t __readlink_real(const char*, char*, size_t) __RENAME(readlink);
246
247extern ssize_t __readlinkat_chk(int dirfd, const char*, char*, size_t, size_t);
248__errordecl(__readlinkat_dest_size_error, "readlinkat called with size bigger than destination");
249__errordecl(__readlinkat_size_toobig_error, "readlinkat called with size > SSIZE_MAX");
250extern ssize_t __readlinkat_real(int dirfd, const char*, char*, size_t) __RENAME(readlinkat);
251
252#if defined(__BIONIC_FORTIFY)
253
254#if defined(__USE_FILE_OFFSET64)
255#define __PREAD_PREFIX(x) __pread64_ ## x
256#else
257#define __PREAD_PREFIX(x) __pread_ ## x
258#endif
259
260__BIONIC_FORTIFY_INLINE
261ssize_t pread(int fd, void* buf, size_t count, off_t offset) {
262    size_t bos = __bos0(buf);
263
264#if !defined(__clang__)
265    if (__builtin_constant_p(count) && (count > SSIZE_MAX)) {
266        __PREAD_PREFIX(count_toobig_error)();
267    }
268
269    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
270        return __PREAD_PREFIX(real)(fd, buf, count, offset);
271    }
272
273    if (__builtin_constant_p(count) && (count > bos)) {
274        __PREAD_PREFIX(dest_size_error)();
275    }
276
277    if (__builtin_constant_p(count) && (count <= bos)) {
278        return __PREAD_PREFIX(real)(fd, buf, count, offset);
279    }
280#endif
281
282    return __PREAD_PREFIX(chk)(fd, buf, count, offset, bos);
283}
284
285__BIONIC_FORTIFY_INLINE
286ssize_t pread64(int fd, void* buf, size_t count, off64_t offset) {
287    size_t bos = __bos0(buf);
288
289#if !defined(__clang__)
290    if (__builtin_constant_p(count) && (count > SSIZE_MAX)) {
291        __pread64_count_toobig_error();
292    }
293
294    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
295        return __pread64_real(fd, buf, count, offset);
296    }
297
298    if (__builtin_constant_p(count) && (count > bos)) {
299        __pread64_dest_size_error();
300    }
301
302    if (__builtin_constant_p(count) && (count <= bos)) {
303        return __pread64_real(fd, buf, count, offset);
304    }
305#endif
306
307    return __pread64_chk(fd, buf, count, offset, bos);
308}
309
310__BIONIC_FORTIFY_INLINE
311ssize_t read(int fd, void* buf, size_t count) {
312    size_t bos = __bos0(buf);
313
314#if !defined(__clang__)
315    if (__builtin_constant_p(count) && (count > SSIZE_MAX)) {
316        __read_count_toobig_error();
317    }
318
319    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
320        return __read_real(fd, buf, count);
321    }
322
323    if (__builtin_constant_p(count) && (count > bos)) {
324        __read_dest_size_error();
325    }
326
327    if (__builtin_constant_p(count) && (count <= bos)) {
328        return __read_real(fd, buf, count);
329    }
330#endif
331
332    return __read_chk(fd, buf, count, bos);
333}
334
335__BIONIC_FORTIFY_INLINE
336ssize_t readlink(const char* path, char* buf, size_t size) {
337    size_t bos = __bos(buf);
338
339#if !defined(__clang__)
340    if (__builtin_constant_p(size) && (size > SSIZE_MAX)) {
341        __readlink_size_toobig_error();
342    }
343
344    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
345        return __readlink_real(path, buf, size);
346    }
347
348    if (__builtin_constant_p(size) && (size > bos)) {
349        __readlink_dest_size_error();
350    }
351
352    if (__builtin_constant_p(size) && (size <= bos)) {
353        return __readlink_real(path, buf, size);
354    }
355#endif
356
357    return __readlink_chk(path, buf, size, bos);
358}
359
360__BIONIC_FORTIFY_INLINE
361ssize_t readlinkat(int dirfd, const char* path, char* buf, size_t size) {
362    size_t bos = __bos(buf);
363
364#if !defined(__clang__)
365    if (__builtin_constant_p(size) && (size > SSIZE_MAX)) {
366        __readlinkat_size_toobig_error();
367    }
368
369    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
370        return __readlinkat_real(dirfd, path, buf, size);
371    }
372
373    if (__builtin_constant_p(size) && (size > bos)) {
374        __readlinkat_dest_size_error();
375    }
376
377    if (__builtin_constant_p(size) && (size <= bos)) {
378        return __readlinkat_real(dirfd, path, buf, size);
379    }
380#endif
381
382    return __readlinkat_chk(dirfd, path, buf, size, bos);
383}
384
385#endif /* defined(__BIONIC_FORTIFY) */
386
387__END_DECLS
388
389#endif /* _UNISTD_H_ */
390