1 /* Linux open syscall implementation, LFS.
2    Copyright (C) 1991-2021 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <fcntl.h>
22 #include <stdarg.h>
23 #include <sysdep-cancel.h>
24 #include <shlib-compat.h>
25 
26 
27 #ifdef __OFF_T_MATCHES_OFF64_T
28 # define EXTRA_OPEN_FLAGS 0
29 #else
30 # define EXTRA_OPEN_FLAGS O_LARGEFILE
31 #endif
32 
33 /* Open FILE with access OFLAG.  If O_CREAT or O_TMPFILE is in OFLAG,
34    a third argument is the file protection.  */
35 int
__libc_open64(const char * file,int oflag,...)36 __libc_open64 (const char *file, int oflag, ...)
37 {
38   int mode = 0;
39 
40   if (__OPEN_NEEDS_MODE (oflag))
41     {
42       va_list arg;
43       va_start (arg, oflag);
44       mode = va_arg (arg, int);
45       va_end (arg);
46     }
47 
48   return SYSCALL_CANCEL (openat, AT_FDCWD, file, oflag | EXTRA_OPEN_FLAGS,
49 			 mode);
50 }
51 
52 strong_alias (__libc_open64, __open64)
53 libc_hidden_weak (__open64)
54 weak_alias (__libc_open64, open64)
55 
56 #ifdef __OFF_T_MATCHES_OFF64_T
57 strong_alias (__libc_open64, __libc_open)
58 strong_alias (__libc_open64, __open)
59 libc_hidden_weak (__open)
60 weak_alias (__libc_open64, open)
61 #endif
62 
63 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_1, GLIBC_2_2)
64 compat_symbol (libc, __libc_open64, open64, GLIBC_2_2);
65 #endif
66