1 /* Copyright (C) 2005-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
24 #include <kernel_stat.h>
27 #include <sys/syscall.h>
29 #include <kernel-features.h>
31 /* Get information about the file NAME in BUF. */
34 __fxstatat64 (int vers
, int fd
, const char *file
, struct stat64
*st
, int flag
)
36 if (__glibc_unlikely (vers
!= _STAT_VER_LINUX
))
43 INTERNAL_SYSCALL_DECL (err
);
46 # ifndef __ASSUME_ATFCTS
47 if (__have_atfcts
>= 0)
50 result
= INTERNAL_SYSCALL (fstatat64
, err
, 4, fd
, file
, st
, flag
);
51 # ifndef __ASSUME_ATFCTS
52 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result
, err
), 1)
53 && INTERNAL_SYSCALL_ERRNO (result
, err
) == ENOSYS
)
57 if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result
, err
), 1))
61 __set_errno (INTERNAL_SYSCALL_ERRNO (result
, err
));
67 #ifndef __ASSUME_ATFCTS
68 if (flag
& ~AT_SYMLINK_NOFOLLOW
)
76 if (fd
!= AT_FDCWD
&& file
[0] != '/')
78 size_t filelen
= strlen (file
);
79 if (__glibc_unlikely (filelen
== 0))
85 static const char procfd
[] = "/proc/self/fd/%d/%s";
86 /* Buffer for the path name we are going to use. It consists of
87 - the string /proc/self/fd/
88 - the file descriptor number
89 - the file name provided.
90 The final NUL is included in the sizeof. A bit of overhead
91 due to the format elements compensates for possible negative
93 size_t buflen
= sizeof (procfd
) + sizeof (int) * 3 + filelen
;
94 buf
= alloca (buflen
);
96 __snprintf (buf
, buflen
, procfd
, fd
, file
);
100 if (flag
& AT_SYMLINK_NOFOLLOW
)
101 result
= INTERNAL_SYSCALL (lstat64
, err
, 2, file
, st
);
103 result
= INTERNAL_SYSCALL (stat64
, err
, 2, file
, st
);
104 if (__glibc_likely (!INTERNAL_SYSCALL_ERROR_P (result
, err
)))
106 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
107 if (st
->__st_ino
!= (__ino_t
) st
->st_ino
)
108 st
->st_ino
= st
->__st_ino
;
112 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result
, err
), fd
, buf
);
117 libc_hidden_def (__fxstatat64
)