| /* Copyright (C) 2005-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <kernel_stat.h> |
| |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| |
| #include <kernel-features.h> |
| |
| /* Get information about the file NAME in BUF. */ |
| |
| int |
| __fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag) |
| { |
| if (__builtin_expect (vers != _STAT_VER_LINUX, 0)) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| int result; |
| INTERNAL_SYSCALL_DECL (err); |
| |
| #ifdef __NR_fstatat64 |
| # ifndef __ASSUME_ATFCTS |
| if (__have_atfcts >= 0) |
| # endif |
| { |
| result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, flag); |
| # ifndef __ASSUME_ATFCTS |
| if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1) |
| && INTERNAL_SYSCALL_ERRNO (result, err) == ENOSYS) |
| __have_atfcts = -1; |
| else |
| # endif |
| if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1)) |
| return 0; |
| else |
| { |
| __set_errno (INTERNAL_SYSCALL_ERRNO (result, err)); |
| return -1; |
| } |
| } |
| #endif |
| |
| #ifndef __ASSUME_ATFCTS |
| if (flag & ~AT_SYMLINK_NOFOLLOW) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| char *buf = NULL; |
| |
| if (fd != AT_FDCWD && file[0] != '/') |
| { |
| size_t filelen = strlen (file); |
| if (__builtin_expect (filelen == 0, 0)) |
| { |
| __set_errno (ENOENT); |
| return -1; |
| } |
| |
| static const char procfd[] = "/proc/self/fd/%d/%s"; |
| /* Buffer for the path name we are going to use. It consists of |
| - the string /proc/self/fd/ |
| - the file descriptor number |
| - the file name provided. |
| The final NUL is included in the sizeof. A bit of overhead |
| due to the format elements compensates for possible negative |
| numbers. */ |
| size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; |
| buf = alloca (buflen); |
| |
| __snprintf (buf, buflen, procfd, fd, file); |
| file = buf; |
| } |
| |
| if (flag & AT_SYMLINK_NOFOLLOW) |
| result = INTERNAL_SYSCALL (lstat64, err, 2, file, st); |
| else |
| result = INTERNAL_SYSCALL (stat64, err, 2, file, st); |
| if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) |
| { |
| # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0 |
| if (st->__st_ino != (__ino_t) st->st_ino) |
| st->st_ino = st->__st_ino; |
| # endif |
| return result; |
| } |
| __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); |
| |
| return -1; |
| #endif |
| } |
| libc_hidden_def (__fxstatat64) |