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 _FCNTL_H
30#define _FCNTL_H
31
32#include <sys/cdefs.h>
33#include <sys/types.h>
34#include <linux/fadvise.h>
35#include <linux/fcntl.h>
36#include <linux/uio.h>
37#include <unistd.h>  /* this is not required, but makes client code much happier */
38
39__BEGIN_DECLS
40
41#ifdef __LP64__
42/* LP64 kernels don't have flock64 because their flock is 64-bit. */
43struct flock64 {
44  short l_type;
45  short l_whence;
46  off64_t l_start;
47  off64_t l_len;
48  pid_t l_pid;
49};
50#define F_GETLK64  F_GETLK
51#define F_SETLK64  F_SETLK
52#define F_SETLKW64 F_SETLKW
53#endif
54
55#define O_ASYNC FASYNC
56
57#define SPLICE_F_MOVE 1
58#define SPLICE_F_NONBLOCK 2
59#define SPLICE_F_MORE 4
60#define SPLICE_F_GIFT 8
61
62#define SYNC_FILE_RANGE_WAIT_BEFORE 1
63#define SYNC_FILE_RANGE_WRITE 2
64#define SYNC_FILE_RANGE_WAIT_AFTER 4
65
66extern int creat(const char*, mode_t);
67extern int creat64(const char*, mode_t);
68extern int fallocate64(int, int, off64_t, off64_t);
69extern int fallocate(int, int, off_t, off_t);
70extern int fcntl(int, int, ...);
71extern int openat(int, const char*, int, ...);
72extern int openat64(int, const char*, int, ...);
73extern int open(const char*, int, ...);
74extern int open64(const char*, int, ...);
75extern int posix_fadvise64(int, off64_t, off64_t, int);
76extern int posix_fadvise(int, off_t, off_t, int);
77extern int posix_fallocate64(int, off64_t, off64_t);
78extern int posix_fallocate(int, off_t, off_t);
79extern ssize_t splice(int, off64_t*, int, off64_t*, size_t, unsigned int);
80extern ssize_t tee(int, int, size_t, unsigned int);
81extern int unlinkat(int, const char*, int);
82extern ssize_t vmsplice(int, const struct iovec*, size_t, unsigned int);
83
84#if defined(__BIONIC_FORTIFY)
85
86extern int __open_2(const char*, int);
87extern int __open_real(const char*, int, ...) __asm__(__USER_LABEL_PREFIX__ "open");
88extern int __openat_2(int, const char*, int);
89extern int __openat_real(int, const char*, int, ...) __asm__(__USER_LABEL_PREFIX__ "openat");
90__errordecl(__creat_missing_mode, "called with O_CREAT, but missing mode");
91__errordecl(__creat_too_many_args, "too many arguments");
92
93#if !defined(__clang__)
94
95__BIONIC_FORTIFY_INLINE
96int open(const char* pathname, int flags, ...) {
97    if (__builtin_constant_p(flags)) {
98        if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
99            __creat_missing_mode();  // compile time error
100        }
101    }
102
103    if (__builtin_va_arg_pack_len() > 1) {
104        __creat_too_many_args();  // compile time error
105    }
106
107    if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
108        return __open_2(pathname, flags);
109    }
110
111    return __open_real(pathname, flags, __builtin_va_arg_pack());
112}
113
114__BIONIC_FORTIFY_INLINE
115int openat(int dirfd, const char* pathname, int flags, ...) {
116    if (__builtin_constant_p(flags)) {
117        if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
118            __creat_missing_mode();  // compile time error
119        }
120    }
121
122    if (__builtin_va_arg_pack_len() > 1) {
123        __creat_too_many_args();  // compile time error
124    }
125
126    if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
127        return __openat_2(dirfd, pathname, flags);
128    }
129
130    return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack());
131}
132
133#endif /* !defined(__clang__) */
134
135#endif /* defined(__BIONIC_FORTIFY) */
136
137__END_DECLS
138
139#endif /* _FCNTL_H */
140