unistd.h revision a7821b7121933b361554b28a2f9455783a330591 
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#ifndef _UNISTD_H_
29#define _UNISTD_H_
30
31#include <stddef.h>
32#include <sys/cdefs.h>
33#include <sys/types.h>
34#include <sys/select.h>
35#include <sys/sysconf.h>
36#include <pathconf.h>
37
38__BEGIN_DECLS
39
40/* Standard file descriptor numbers. */
41#define STDIN_FILENO	0
42#define STDOUT_FILENO	1
43#define STDERR_FILENO	2
44
45/* Values for whence in fseek and lseek */
46#define SEEK_SET 0
47#define SEEK_CUR 1
48#define SEEK_END 2
49
50extern char** environ;
51
52extern __noreturn void _exit(int);
53
54extern pid_t  fork(void);
55extern pid_t  vfork(void);
56extern pid_t  getpid(void);
57extern pid_t  gettid(void);
58extern pid_t  getpgid(pid_t);
59extern int    setpgid(pid_t, pid_t);
60extern pid_t  getppid(void);
61extern pid_t  getpgrp(void);
62extern int    setpgrp(void);
63extern pid_t  getsid(pid_t);
64extern pid_t  setsid(void);
65
66extern int execv(const char *, char * const *);
67extern int execvp(const char *, char * const *);
68extern int execvpe(const char *, char * const *, char * const *);
69extern int execve(const char *, char * const *, char * const *);
70extern int execl(const char *, const char *, ...);
71extern int execlp(const char *, const char *, ...);
72extern int execle(const char *, const char *, ...);
73
74/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
75extern int prctl(int  option, ...);
76
77extern int nice(int);
78
79extern int setuid(uid_t);
80extern uid_t getuid(void);
81extern int seteuid(uid_t);
82extern uid_t geteuid(void);
83extern int setgid(gid_t);
84extern gid_t getgid(void);
85extern int setegid(gid_t);
86extern gid_t getegid(void);
87extern int getgroups(int, gid_t *);
88extern int setgroups(size_t, const gid_t *);
89extern int setreuid(uid_t, uid_t);
90extern int setregid(gid_t, gid_t);
91extern int setresuid(uid_t, uid_t, uid_t);
92extern int setresgid(gid_t, gid_t, gid_t);
93extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
94extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
95extern int issetugid(void);
96extern char* getlogin(void);
97extern char* getusershell(void);
98extern void setusershell(void);
99extern void endusershell(void);
100
101
102
103/* Macros for access() */
104#define R_OK  4  /* Read */
105#define W_OK  2  /* Write */
106#define X_OK  1  /* Execute */
107#define F_OK  0  /* Existence */
108
109extern int access(const char*, int);
110extern int faccessat(int, const char*, int, int);
111extern int link(const char*, const char*);
112extern int linkat(int, const char*, int, const char*, int);
113extern int unlink(const char*);
114extern int unlinkat(int, const char*, int);
115extern int chdir(const char *);
116extern int fchdir(int);
117extern int rmdir(const char *);
118extern int pipe(int *);
119#ifdef _GNU_SOURCE
120extern int pipe2(int *, int);
121#endif
122extern int chroot(const char *);
123extern int symlink(const char*, const char*);
124extern int symlinkat(const char*, int, const char*);
125extern ssize_t readlink(const char*, char*, size_t);
126extern ssize_t readlinkat(int, const char*, char*, size_t);
127extern int chown(const char *, uid_t, gid_t);
128extern int fchown(int, uid_t, gid_t);
129extern int fchownat(int, const char*, uid_t, gid_t, int);
130extern int lchown(const char *, uid_t, gid_t);
131extern int truncate(const char *, off_t);
132extern int truncate64(const char *, off64_t);
133extern char *getcwd(char *, size_t);
134
135extern int sync(void);
136
137extern int close(int);
138extern off_t lseek(int, off_t, int);
139extern off64_t lseek64(int, off64_t, int);
140
141extern ssize_t read(int, void *, size_t);
142extern ssize_t write(int, const void *, size_t);
143extern ssize_t pread(int, void *, size_t, off_t);
144extern ssize_t pread64(int, void *, size_t, off64_t);
145extern ssize_t pwrite(int, const void *, size_t, off_t);
146extern ssize_t pwrite64(int, const void *, size_t, off64_t);
147
148extern int dup(int);
149extern int dup2(int, int);
150#ifdef _GNU_SOURCE
151extern int dup3(int, int, int);
152#endif
153extern int fcntl(int, int, ...);
154extern int ioctl(int, int, ...);
155extern int flock(int, int);
156extern int fsync(int);
157extern int fdatasync(int);
158extern int ftruncate(int, off_t);
159extern int ftruncate64(int, off64_t);
160
161extern int pause(void);
162extern unsigned int alarm(unsigned int);
163extern unsigned int sleep(unsigned int);
164extern int usleep(useconds_t);
165
166extern int gethostname(char *, size_t);
167
168extern int getdtablesize(void);
169
170extern void *__brk(void *);
171extern int brk(void *);
172extern void *sbrk(ptrdiff_t);
173
174extern int getopt(int, char * const *, const char *);
175extern char *optarg;
176extern int optind, opterr, optopt;
177
178extern int isatty(int);
179extern char* ttyname(int);
180extern int ttyname_r(int, char*, size_t);
181
182extern int  acct(const char*  filepath);
183
184int getpagesize(void);
185
186extern int sysconf(int  name);
187
188extern int daemon(int, int);
189
190#if defined(__arm__) || (defined(__mips__) && !defined(__LP64__))
191extern int cacheflush(long, long, long);
192    /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
193#endif
194
195extern pid_t tcgetpgrp(int fd);
196extern int   tcsetpgrp(int fd, pid_t _pid);
197
198#if 0 /* MISSING FROM BIONIC */
199extern int execlpe(const char *, const char *, ...);
200extern int getfsuid(uid_t);
201extern int setfsuid(uid_t);
202extern int getlogin_r(char* name, size_t namesize);
203extern int sethostname(const char *, size_t);
204extern int getdomainname(char *, size_t);
205extern int setdomainname(const char *, size_t);
206#endif /* MISSING */
207
208/* Used to retry syscalls that can return EINTR. */
209#define TEMP_FAILURE_RETRY(exp) ({         \
210    __typeof__(exp) _rc;                   \
211    do {                                   \
212        _rc = (exp);                       \
213    } while (_rc == -1 && errno == EINTR); \
214    _rc; })
215
216#if defined(__BIONIC_FORTIFY)
217extern ssize_t __read_chk(int, void*, size_t, size_t);
218__errordecl(__read_dest_size_error, "read called with size bigger than destination");
219__errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX");
220extern ssize_t __read_real(int, void*, size_t)
221    __asm__(__USER_LABEL_PREFIX__ "read");
222
223__BIONIC_FORTIFY_INLINE
224ssize_t read(int fd, void* buf, size_t count) {
225    size_t bos = __bos0(buf);
226
227#if !defined(__clang__)
228    if (__builtin_constant_p(count) && (count > SSIZE_MAX)) {
229        __read_count_toobig_error();
230    }
231
232    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
233        return __read_real(fd, buf, count);
234    }
235
236    if (__builtin_constant_p(count) && (count > bos)) {
237        __read_dest_size_error();
238    }
239
240    if (__builtin_constant_p(count) && (count <= bos)) {
241        return __read_real(fd, buf, count);
242    }
243#endif
244
245    return __read_chk(fd, buf, count, bos);
246}
247#endif /* defined(__BIONIC_FORTIFY) */
248
249__END_DECLS
250
251#endif /* _UNISTD_H_ */
252