1 /* Linux openat syscall implementation, LFS.
2    Copyright (C) 2007-2021 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 <fcntl.h>
20 #include <stdarg.h>
21 
22 #include <sysdep-cancel.h>
23 
24 #ifdef __OFF_T_MATCHES_OFF64_T
25 # define EXTRA_OPEN_FLAGS 0
26 #else
27 # define EXTRA_OPEN_FLAGS O_LARGEFILE
28 #endif
29 
30 /* Open FILE with access OFLAG.  Interpret relative paths relative to
31    the directory associated with FD.  If OFLAG includes O_CREAT or
32    O_TMPFILE, a fourth argument is the file protection.  */
33 int
__libc_openat64(int fd,const char * file,int oflag,...)34 __libc_openat64 (int fd, const char *file, int oflag, ...)
35 {
36   mode_t mode = 0;
37   if (__OPEN_NEEDS_MODE (oflag))
38     {
39       va_list arg;
40       va_start (arg, oflag);
41       mode = va_arg (arg, mode_t);
42       va_end (arg);
43     }
44 
45   return SYSCALL_CANCEL (openat, fd, file, oflag | EXTRA_OPEN_FLAGS, mode);
46 }
47 
48 strong_alias (__libc_openat64, __openat64)
49 libc_hidden_weak (__openat64)
50 weak_alias (__libc_openat64, openat64)
51 
52 #ifdef __OFF_T_MATCHES_OFF64_T
53 strong_alias (__libc_openat64, __openat)
54 libc_hidden_weak (__openat)
55 weak_alias (__libc_openat64, openat)
56 #endif
57