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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
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19990502 sourceware importbinu_ss_19990502
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+/* 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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+
+/*
+
+NAME
+
+ fdmatch -- see if two file descriptors refer to same file
+
+SYNOPSIS
+
+ int fdmatch (int fd1, int fd2)
+
+DESCRIPTION
+
+ 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 (stdout for example) or from the SVR4 /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&minor
+ device numbers and inode numbers.
+
+BUGS
+
+ (FIXME: does this work for networks?)
+ It works for NFS, which assigns a device number to each mount.
+
+*/
+
+#include "ansidecl.h"
+#include "libiberty.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int fdmatch (fd1, fd2)
+ 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);
+ }
+}