mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-25 17:59:50 +08:00
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/* 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);
|
|
}
|
|
}
|