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 _FCNTL_H
29 #define _FCNTL_H
30
31 #include <sys/cdefs.h>
32 #include <sys/types.h>
33 #include <linux/fcntl.h>
34 #include <unistd.h> /* this is not required, but makes client code much happier */
35
36 __BEGIN_DECLS
37
38 #ifndef O_ASYNC
39 #define O_ASYNC FASYNC
40 #endif
41
42 #ifndef O_CLOEXEC
43 #define O_CLOEXEC 02000000
44 #endif
45
46 extern int open(const char* path, int mode, ...);
47 extern int openat(int fd, const char* path, int mode, ...);
48 extern int unlinkat(int dirfd, const char *pathname, int flags);
49 extern int fcntl(int fd, int command, ...);
50 extern int creat(const char* path, mode_t mode);
51
52 #if defined(__BIONIC_FORTIFY) && !defined(__clang__)
53 __errordecl(__creat_missing_mode, "called with O_CREAT, but missing mode");
54 __errordecl(__creat_too_many_args, "too many arguments");
55 extern int __open_real(const char *pathname, int flags, ...)
56 __asm__(__USER_LABEL_PREFIX__ "open");
57 extern int __open_2(const char *, int);
58
59 __BIONIC_FORTIFY_INLINE
open(const char * pathname,int flags,...)60 int open(const char *pathname, int flags, ...) {
61 if (__builtin_constant_p(flags)) {
62 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
63 __creat_missing_mode(); // compile time error
64 }
65 }
66
67 if (__builtin_va_arg_pack_len() > 1) {
68 __creat_too_many_args(); // compile time error
69 }
70
71 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
72 return __open_2(pathname, flags);
73 }
74
75 return __open_real(pathname, flags, __builtin_va_arg_pack());
76 }
77
78 extern int __openat_2(int, const char *, int);
79 extern int __openat_real(int dirfd, const char *pathname, int flags, ...)
80 __asm__(__USER_LABEL_PREFIX__ "openat");
81
82 __BIONIC_FORTIFY_INLINE
openat(int dirfd,const char * pathname,int flags,...)83 int openat(int dirfd, const char *pathname, int flags, ...) {
84 if (__builtin_constant_p(flags)) {
85 if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
86 __creat_missing_mode(); // compile time error
87 }
88 }
89
90 if (__builtin_va_arg_pack_len() > 1) {
91 __creat_too_many_args(); // compile time error
92 }
93
94 if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
95 return __openat_2(dirfd, pathname, flags);
96 }
97
98 return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack());
99 }
100
101 #endif /* defined(__BIONIC_FORTIFY) && !defined(__clang__) */
102
103 __END_DECLS
104
105 #endif /* _FCNTL_H */
106