From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libiberty/fdmatch.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 libiberty/fdmatch.c (limited to 'libiberty/fdmatch.c') diff --git a/libiberty/fdmatch.c b/libiberty/fdmatch.c new file mode 100644 index 000000000..f613cb3c0 --- /dev/null +++ b/libiberty/fdmatch.c @@ -0,0 +1,68 @@ +/* Compare two open file descriptors to see if they refer to the same file. + Copyright (C) 1991 Free Software Foundation, Inc. + +This file is part of the libiberty library. +Libiberty is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public +License as published by the Free Software Foundation; either +version 2 of the License, or (at your option) any later version. + +Libiberty 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with libiberty; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, +Boston, MA 02110-1301, USA. */ + + +/* + +@deftypefn Extension int fdmatch (int @var{fd1}, int @var{fd2}) + +Check to see if two open file descriptors refer to the same file. +This is useful, for example, when we have an open file descriptor for +an unnamed file, and the name of a file that we believe to correspond +to that fd. This can happen when we are exec'd with an already open +file (@code{stdout} for example) or from the SVR4 @file{/proc} calls +that return open file descriptors for mapped address spaces. All we +have to do is open the file by name and check the two file descriptors +for a match, which is done by comparing major and minor device numbers +and inode numbers. + +@end deftypefn + +BUGS + + (FIXME: does this work for networks?) + It works for NFS, which assigns a device number to each mount. + +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#include "ansidecl.h" +#include "libiberty.h" +#include +#include + +int fdmatch (int fd1, int fd2) +{ + struct stat sbuf1; + struct stat sbuf2; + + if ((fstat (fd1, &sbuf1) == 0) && + (fstat (fd2, &sbuf2) == 0) && + (sbuf1.st_dev == sbuf2.st_dev) && + (sbuf1.st_ino == sbuf2.st_ino)) + { + return (1); + } + else + { + return (0); + } +} -- cgit v1.2.3