unistd.h revision 1242f7eb67c678922b55e2077d9cf2d5cdc85b15 
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) __pure2;
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
74extern int nice(int);
75
76extern int setuid(uid_t);
77extern uid_t getuid(void);
78extern int seteuid(uid_t);
79extern uid_t geteuid(void);
80extern int setgid(gid_t);
81extern gid_t getgid(void);
82extern int setegid(gid_t);
83extern gid_t getegid(void);
84extern int getgroups(int, gid_t *);
85extern int setgroups(size_t, const gid_t *);
86extern int setreuid(uid_t, uid_t);
87extern int setregid(gid_t, gid_t);
88extern int setresuid(uid_t, uid_t, uid_t);
89extern int setresgid(gid_t, gid_t, gid_t);
90extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
91extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
92extern char* getlogin(void);
93extern char* getusershell(void);
94extern void setusershell(void);
95extern void endusershell(void);
96
97
98
99/* Macros for access() */
100#define R_OK  4  /* Read */
101#define W_OK  2  /* Write */
102#define X_OK  1  /* Execute */
103#define F_OK  0  /* Existence */
104
105extern int access(const char*, int);
106extern int faccessat(int, const char*, int, int);
107extern int link(const char*, const char*);
108extern int linkat(int, const char*, int, const char*, int);
109extern int unlink(const char*);
110extern int unlinkat(int, const char*, int);
111extern int chdir(const char *);
112extern int fchdir(int);
113extern int rmdir(const char *);
114extern int pipe(int *);
115#ifdef _GNU_SOURCE
116extern int pipe2(int *, int);
117#endif
118extern int chroot(const char *);
119extern int symlink(const char*, const char*);
120extern int symlinkat(const char*, int, const char*);
121extern ssize_t readlink(const char*, char*, size_t);
122extern ssize_t readlinkat(int, const char*, char*, size_t);
123extern int chown(const char *, uid_t, gid_t);
124extern int fchown(int, uid_t, gid_t);
125extern int fchownat(int, const char*, uid_t, gid_t, int);
126extern int lchown(const char *, uid_t, gid_t);
127extern int truncate(const char *, off_t);
128extern int truncate64(const char *, off64_t);
129extern char *getcwd(char *, size_t);
130
131extern int sync(void);
132
133extern int close(int);
134extern off_t lseek(int, off_t, int);
135extern off64_t lseek64(int, off64_t, int);
136
137extern ssize_t read(int, void *, size_t);
138extern ssize_t write(int, const void *, size_t);
139extern ssize_t pread(int, void *, size_t, off_t);
140extern ssize_t pread64(int, void *, size_t, off64_t);
141extern ssize_t pwrite(int, const void *, size_t, off_t);
142extern ssize_t pwrite64(int, const void *, size_t, off64_t);
143
144extern int dup(int);
145extern int dup2(int, int);
146#ifdef _GNU_SOURCE
147extern int dup3(int, int, int);
148#endif
149extern int fcntl(int, int, ...);
150extern int ioctl(int, int, ...);
151extern int flock(int, int);
152extern int fsync(int);
153extern int fdatasync(int);
154extern int ftruncate(int, off_t);
155extern int ftruncate64(int, off64_t);
156
157extern int pause(void);
158extern unsigned int alarm(unsigned int);
159extern unsigned int sleep(unsigned int);
160extern int usleep(useconds_t);
161
162extern int gethostname(char *, size_t);
163
164extern void *__brk(void *);
165extern int brk(void *);
166extern void *sbrk(ptrdiff_t);
167
168extern int getopt(int, char * const *, const char *);
169extern char *optarg;
170extern int optind, opterr, optopt;
171
172extern int isatty(int);
173extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead");
174extern int ttyname_r(int, char*, size_t);
175
176extern int  acct(const char*  filepath);
177
178int getpagesize(void);
179
180extern int sysconf(int  name);
181
182extern int daemon(int, int);
183
184#if defined(__arm__) || (defined(__mips__) && !defined(__LP64__))
185extern int cacheflush(long, long, long);
186    /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
187#endif
188
189extern pid_t tcgetpgrp(int fd);
190extern int   tcsetpgrp(int fd, pid_t _pid);
191
192/* Used to retry syscalls that can return EINTR. */
193#define TEMP_FAILURE_RETRY(exp) ({         \
194    __typeof__(exp) _rc;                   \
195    do {                                   \
196        _rc = (exp);                       \
197    } while (_rc == -1 && errno == EINTR); \
198    _rc; })
199
200#if defined(__BIONIC_FORTIFY)
201extern ssize_t __read_chk(int, void*, size_t, size_t);
202__errordecl(__read_dest_size_error, "read called with size bigger than destination");
203__errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX");
204extern ssize_t __read_real(int, void*, size_t)
205    __asm__(__USER_LABEL_PREFIX__ "read");
206
207__BIONIC_FORTIFY_INLINE
208ssize_t read(int fd, void* buf, size_t count) {
209    size_t bos = __bos0(buf);
210
211#if !defined(__clang__)
212    if (__builtin_constant_p(count) && (count > SSIZE_MAX)) {
213        __read_count_toobig_error();
214    }
215
216    if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
217        return __read_real(fd, buf, count);
218    }
219
220    if (__builtin_constant_p(count) && (count > bos)) {
221        __read_dest_size_error();
222    }
223
224    if (__builtin_constant_p(count) && (count <= bos)) {
225        return __read_real(fd, buf, count);
226    }
227#endif
228
229    return __read_chk(fd, buf, count, bos);
230}
231#endif /* defined(__BIONIC_FORTIFY) */
232
233__END_DECLS
234
235#endif /* _UNISTD_H_ */
236