unistd.h revision 8d2532763981d132b02df157e4cc363c39330090 
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;
51extern __noreturn void _exit(int);
52
53extern pid_t  fork(void);
54extern pid_t  vfork(void);
55extern pid_t  getpid(void);
56extern pid_t  gettid(void);
57extern pid_t  getpgid(pid_t);
58extern int    setpgid(pid_t, pid_t);
59extern pid_t  getppid(void);
60extern pid_t  getpgrp(void);
61extern int    setpgrp(void);
62extern pid_t  getsid(pid_t);
63extern pid_t  setsid(void);
64
65extern int execv(const char *, char * const *);
66extern int execvp(const char *, char * const *);
67extern int execve(const char *, char * const *, char * const *);
68extern int execl(const char *, const char *, ...);
69extern int execlp(const char *, const char *, ...);
70extern int execle(const char *, const char *, ...);
71
72/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
73extern int prctl(int  option, ...);
74
75extern int nice(int);
76
77extern int setuid(uid_t);
78extern uid_t getuid(void);
79extern int seteuid(uid_t);
80extern uid_t geteuid(void);
81extern int setgid(gid_t);
82extern gid_t getgid(void);
83extern int setegid(gid_t);
84extern gid_t getegid(void);
85extern int getgroups(int, gid_t *);
86extern int setgroups(size_t, const gid_t *);
87extern int setreuid(uid_t, uid_t);
88extern int setregid(gid_t, gid_t);
89extern int setresuid(uid_t, uid_t, uid_t);
90extern int setresgid(gid_t, gid_t, gid_t);
91extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
92extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
93extern int issetugid(void);
94extern char* getlogin(void);
95extern char* getusershell(void);
96extern void setusershell(void);
97extern void endusershell(void);
98
99
100
101/* Macros for access() */
102#define R_OK  4  /* Read */
103#define W_OK  2  /* Write */
104#define X_OK  1  /* Execute */
105#define F_OK  0  /* Existence */
106
107extern int access(const char *, int);
108extern int faccessat(int, const char *, int, int);
109extern int link(const char *, const char *);
110extern int unlink(const char *);
111extern int chdir(const char *);
112extern int fchdir(int);
113extern int rmdir(const char *);
114extern int pipe(int *);
115#ifdef _GNU_SOURCE  /* GLibc compatibility */
116extern int pipe2(int *, int);
117#endif
118extern int chroot(const char *);
119extern int symlink(const char *, const char *);
120extern int readlink(const char *, char *, size_t);
121extern int chown(const char *, uid_t, gid_t);
122extern int fchown(int, uid_t, gid_t);
123extern int lchown(const char *, uid_t, gid_t);
124extern int truncate(const char *, off_t);
125extern int truncate64(const char *, off64_t);
126extern char *getcwd(char *, size_t);
127
128extern int sync(void);
129
130extern int close(int);
131extern off_t lseek(int, off_t, int);
132extern off64_t lseek64(int, off64_t, int);
133
134extern ssize_t read(int, void *, size_t);
135extern ssize_t write(int, const void *, size_t);
136extern ssize_t pread(int, void *, size_t, off_t);
137extern ssize_t pread64(int, void *, size_t, off64_t);
138extern ssize_t pwrite(int, const void *, size_t, off_t);
139extern ssize_t pwrite64(int, const void *, size_t, off64_t);
140
141extern int dup(int);
142extern int dup2(int, int);
143extern int fcntl(int, int, ...);
144extern int ioctl(int, int, ...);
145extern int flock(int, int);
146extern int fsync(int);
147extern int fdatasync(int);
148extern int ftruncate(int, off_t);
149extern int ftruncate64(int, off64_t);
150
151extern int pause(void);
152extern unsigned int alarm(unsigned int);
153extern unsigned int sleep(unsigned int);
154extern int usleep(unsigned long);
155
156extern int gethostname(char *, size_t);
157
158extern int getdtablesize(void);
159
160extern void *__brk(void *);
161extern int brk(void *);
162extern void *sbrk(ptrdiff_t);
163
164extern int getopt(int, char * const *, const char *);
165extern char *optarg;
166extern int optind, opterr, optopt;
167
168extern int isatty(int);
169extern char* ttyname(int);
170extern int ttyname_r(int, char*, size_t);
171
172extern int  acct(const char*  filepath);
173
174int getpagesize(void);
175
176extern int sysconf(int  name);
177
178extern int daemon(int, int);
179
180/* A special syscall that is only available on the ARM, not x86 function. */
181extern int cacheflush(long start, long end, long flags);
182
183extern pid_t tcgetpgrp(int fd);
184extern int   tcsetpgrp(int fd, pid_t _pid);
185
186#if 0 /* MISSING FROM BIONIC */
187extern int execvpe(const char *, char * const *, char * const *);
188extern int execlpe(const char *, const char *, ...);
189extern int getfsuid(uid_t);
190extern int setfsuid(uid_t);
191extern int getlogin_r(char* name, size_t namesize);
192extern int sethostname(const char *, size_t);
193extern int getdomainname(char *, size_t);
194extern int setdomainname(const char *, size_t);
195#endif /* MISSING */
196
197/* Used to retry syscalls that can return EINTR. */
198#define TEMP_FAILURE_RETRY(exp) ({         \
199    typeof (exp) _rc;                      \
200    do {                                   \
201        _rc = (exp);                       \
202    } while (_rc == -1 && errno == EINTR); \
203    _rc; })
204
205__END_DECLS
206
207#endif /* _UNISTD_H_ */
208