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Annotation of src/external/gpl3/binutils.old/dist/libiberty/fdmatch.c, Revision 1.4.8.1

1.1       christos    1: /* Compare two open file descriptors to see if they refer to the same file.
                      2:    Copyright (C) 1991 Free Software Foundation, Inc.
                      3:
                      4: This file is part of the libiberty library.
                      5: Libiberty is free software; you can redistribute it and/or
                      6: modify it under the terms of the GNU Library General Public
                      7: License as published by the Free Software Foundation; either
                      8: version 2 of the License, or (at your option) any later version.
                      9:
                     10: Libiberty is distributed in the hope that it will be useful,
                     11: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     13: Library General Public License for more details.
                     14:
                     15: You should have received a copy of the GNU Library General Public
                     16: License along with libiberty; see the file COPYING.LIB.  If
                     17: not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
                     18: Boston, MA 02110-1301, USA.  */
                     19:
                     20:
                     21: /*
                     22:
                     23: @deftypefn Extension int fdmatch (int @var{fd1}, int @var{fd2})
                     24:
                     25: Check to see if two open file descriptors refer to the same file.
                     26: This is useful, for example, when we have an open file descriptor for
                     27: an unnamed file, and the name of a file that we believe to correspond
                     28: to that fd.  This can happen when we are exec'd with an already open
                     29: file (@code{stdout} for example) or from the SVR4 @file{/proc} calls
                     30: that return open file descriptors for mapped address spaces.  All we
                     31: have to do is open the file by name and check the two file descriptors
                     32: for a match, which is done by comparing major and minor device numbers
                     33: and inode numbers.
                     34:
                     35: @end deftypefn
                     36:
                     37: BUGS
                     38:
                     39:        (FIXME: does this work for networks?)
                     40:        It works for NFS, which assigns a device number to each mount.
                     41:
                     42: */
                     43:
                     44: #ifdef HAVE_CONFIG_H
                     45: #include "config.h"
                     46: #endif
                     47: #include "ansidecl.h"
                     48: #include "libiberty.h"
                     49: #include <sys/types.h>
                     50: #include <sys/stat.h>
                     51:
                     52: int fdmatch (int fd1, int fd2)
                     53: {
                     54:   struct stat sbuf1;
                     55:   struct stat sbuf2;
                     56:
                     57:   if ((fstat (fd1, &sbuf1) == 0) &&
                     58:       (fstat (fd2, &sbuf2) == 0) &&
                     59:       (sbuf1.st_dev == sbuf2.st_dev) &&
                     60:       (sbuf1.st_ino == sbuf2.st_ino))
                     61:     {
                     62:       return (1);
                     63:     }
                     64:   else
                     65:     {
                     66:       return (0);
                     67:     }
                     68: }