/* File identity for the dynamic linker.  Generic POSIX.1 version.

   Copyright (C) 2015-2018 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 <stdbool.h>

#include <sys/stat.h>

/* For POSIX.1 systems, the pair of st_dev and st_ino constitute

   a unique identifier for a file.  */

struct r_file_id

  {

    dev_t dev;

    ino64_t ino;

  };

/* Sample FD to fill in *ID and *ST.  Returns true on success.

   On error, returns false, with errno set.  */

static inline bool

_dl_get_file_id (int fd, struct r_file_id *id, struct stat64 *st)

{

  if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, st) < 0))

    return false;

  id->dev = st->st_dev;

  id->ino = st->st_ino;

  return true;

}

/* Compare two results from _dl_get_file_id for equality.  */

static inline bool

_dl_file_id_match_p (const struct r_file_id *a, const struct r_file_id *b)

{

  return a->dev == b->dev && a->ino == b->ino;

}