Mercurial > hg > CbC > CbC_gcc
comparison libiberty/fdmatch.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 04ced10e8804 |
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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 } |