From c01ae97eb8986600488332f4db98f4b6d6ebedbc Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Tue, 14 Jul 2015 13:15:26 -0700 Subject: Factor file identity rules out of generic rtld code. --- sysdeps/posix/dl-fileid.h | 50 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 sysdeps/posix/dl-fileid.h (limited to 'sysdeps/posix') diff --git a/sysdeps/posix/dl-fileid.h b/sysdeps/posix/dl-fileid.h new file mode 100644 index 0000000000..d0d5436641 --- /dev/null +++ b/sysdeps/posix/dl-fileid.h @@ -0,0 +1,50 @@ +/* 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 + . */ + +#include +#include + +/* 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; +} -- cgit v1.2.3-70-g09d2