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 <linux/capability.h>
37 #include <pathconf.h>
38
39 __BEGIN_DECLS
40
41 /* Standard file descriptor numbers. */
42 #define STDIN_FILENO 0
43 #define STDOUT_FILENO 1
44 #define STDERR_FILENO 2
45
46 /* Values for whence in fseek and lseek */
47 #define SEEK_SET 0
48 #define SEEK_CUR 1
49 #define SEEK_END 2
50
51 extern char **environ;
52 extern __noreturn void _exit(int);
53
54 extern pid_t fork(void);
55 extern pid_t vfork(void);
56 extern pid_t getpid(void);
57 extern pid_t gettid(void);
58 extern pid_t getpgid(pid_t);
59 extern int setpgid(pid_t, pid_t);
60 extern pid_t getppid(void);
61 extern pid_t getpgrp(void);
62 extern int setpgrp(void);
63 extern pid_t getsid(pid_t);
64 extern pid_t setsid(void);
65
66 extern int execv(const char *, char * const *);
67 extern int execvp(const char *, char * const *);
68 extern int execve(const char *, char * const *, char * const *);
69 extern int execl(const char *, const char *, ...);
70 extern int execlp(const char *, const char *, ...);
71 extern int execle(const char *, const char *, ...);
72 extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
73 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
74
75 /* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
76 extern int prctl(int option, ...);
77
78 extern int nice(int);
79
80 extern int setuid(uid_t);
81 extern uid_t getuid(void);
82 extern int seteuid(uid_t);
83 extern uid_t geteuid(void);
84 extern int setgid(gid_t);
85 extern gid_t getgid(void);
86 extern int setegid(gid_t);
87 extern gid_t getegid(void);
88 extern int getgroups(int, gid_t *);
89 extern int setgroups(size_t, const gid_t *);
90 extern int setreuid(uid_t, uid_t);
91 extern int setregid(gid_t, gid_t);
92 extern int setresuid(uid_t, uid_t, uid_t);
93 extern int setresgid(gid_t, gid_t, gid_t);
94 extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
95 extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
96 extern int issetugid(void);
97 extern char* getlogin(void);
98 extern char* getusershell(void);
99 extern void setusershell(void);
100 extern void endusershell(void);
101
102
103
104 /* Macros for access() */
105 #define R_OK 4 /* Read */
106 #define W_OK 2 /* Write */
107 #define X_OK 1 /* Execute */
108 #define F_OK 0 /* Existence */
109
110 extern int access(const char *, int);
111 extern int faccessat(int, const char *, int, int);
112 extern int link(const char *, const char *);
113 extern int unlink(const char *);
114 extern int chdir(const char *);
115 extern int fchdir(int);
116 extern int rmdir(const char *);
117 extern int pipe(int *);
118 #ifdef _GNU_SOURCE /* GLibc compatibility */
119 extern int pipe2(int *, int);
120 #endif
121 extern int chroot(const char *);
122 extern int symlink(const char *, const char *);
123 extern int readlink(const char *, char *, size_t);
124 extern int chown(const char *, uid_t, gid_t);
125 extern int fchown(int, uid_t, gid_t);
126 extern int lchown(const char *, uid_t, gid_t);
127 extern int truncate(const char *, off_t);
128 extern char *getcwd(char *, size_t);
129
130 extern int sync(void);
131
132 extern int close(int);
133 extern off_t lseek(int, off_t, int);
134 extern off64_t lseek64(int, off64_t, int);
135
136 extern ssize_t read(int, void *, size_t);
137 extern ssize_t write(int, const void *, size_t);
138 extern ssize_t pread(int, void *, size_t, off_t);
139 extern ssize_t pread64(int, void *, size_t, off64_t);
140 extern ssize_t pwrite(int, const void *, size_t, off_t);
141 extern ssize_t pwrite64(int, const void *, size_t, off64_t);
142
143 extern int dup(int);
144 extern int dup2(int, int);
145 extern int fcntl(int, int, ...);
146 extern int ioctl(int, int, ...);
147 extern int flock(int, int);
148 extern int fsync(int);
149 extern int fdatasync(int);
150 extern int ftruncate(int, off_t);
151 extern int ftruncate64(int, off64_t);
152
153 extern int pause(void);
154 extern unsigned int alarm(unsigned int);
155 extern unsigned int sleep(unsigned int);
156 extern int usleep(unsigned long);
157
158 extern int gethostname(char *, size_t);
159
160 extern int getdtablesize(void);
161
162 extern void *__brk(void *);
163 extern int brk(void *);
164 extern void *sbrk(ptrdiff_t);
165
166 extern int getopt(int, char * const *, const char *);
167 extern char *optarg;
168 extern int optind, opterr, optopt;
169
170 extern int isatty(int);
171 extern char* ttyname(int);
172 extern int ttyname_r(int, char*, size_t);
173
174 extern int acct(const char* filepath);
175
getpagesize(void)176 static __inline__ int getpagesize(void) {
177 extern unsigned int __page_size;
178 return __page_size;
179 }
__getpageshift(void)180 static __inline__ int __getpageshift(void) {
181 extern unsigned int __page_shift;
182 return __page_shift;
183 }
184
185 extern int sysconf(int name);
186
187 extern int daemon(int, int);
188
189 /* A special syscall that is only available on the ARM, not x86 function. */
190 extern int cacheflush(long start, long end, long flags);
191
192 extern pid_t tcgetpgrp(int fd);
193 extern int tcsetpgrp(int fd, pid_t _pid);
194
195 #if 0 /* MISSING FROM BIONIC */
196 extern int execvpe(const char *, char * const *, char * const *);
197 extern int execlpe(const char *, const char *, ...);
198 extern int getfsuid(uid_t);
199 extern int setfsuid(uid_t);
200 extern int getlogin_r(char* name, size_t namesize);
201 extern int sethostname(const char *, size_t);
202 extern int getdomainname(char *, size_t);
203 extern int setdomainname(const char *, size_t);
204 #endif /* MISSING */
205
206 /* Used to retry syscalls that can return EINTR. */
207 #define TEMP_FAILURE_RETRY(exp) ({ \
208 typeof (exp) _rc; \
209 do { \
210 _rc = (exp); \
211 } while (_rc == -1 && errno == EINTR); \
212 _rc; })
213
214 __END_DECLS
215
216 #endif /* _UNISTD_H_ */
217