| /* 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/>. */ |
| |
| #define __fxstatat64 __fxstatat64_disable |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <sys/stat.h> |
| #include <kernel_stat.h> |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| #include <xstatconv.h> |
| |
| #undef __fxstatat64 |
| |
| #ifdef __ASSUME_ATFCTS |
| # define __have_atfcts 1 |
| #endif |
| |
| /* Get information about the file NAME in BUF. */ |
| int |
| __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| int result, errno_out; |
| |
| /* ??? The __fxstatat entry point is new enough that it must be using |
| vers == _STAT_VER_KERNEL64. For the benefit of dl-fxstatat64.c, we |
| cannot actually check this, lest the compiler not optimize the rest |
| of the function away. */ |
| |
| #ifdef __NR_fstatat64 |
| if (__have_atfcts >= 0) |
| { |
| result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, flag); |
| if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) |
| return result; |
| errno_out = INTERNAL_SYSCALL_ERRNO (result, err); |
| #ifndef __ASSUME_ATFCTS |
| if (errno_out == ENOSYS) |
| __have_atfcts = -1; |
| else |
| #endif |
| { |
| __set_errno (errno_out); |
| return -1; |
| } |
| } |
| #endif /* __NR_fstatat64 */ |
| |
| 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)) |
| return result; |
| |
| errno_out = INTERNAL_SYSCALL_ERRNO (result, err); |
| __atfct_seterrno (errno_out, fd, buf); |
| |
| return -1; |
| } |
| libc_hidden_def (__fxstatat) |
| strong_alias (__fxstatat, __fxstatat64); |
| libc_hidden_ver(__fxstatat, __fxstatat64); |