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Factor file identity rules out of generic rtld code.

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This commit is contained in:
Roland McGrath
2015-07-14 13:15:26 -07:00
parent 38b759496b
commit c01ae97eb8
6 changed files with 125 additions and 12 deletions
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50
sysdeps/posix/dl-fileid.h Normal file
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/* File identity for the dynamic linker. Generic POSIX.1 version.
Copyright (C) 2015 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. 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;
}