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1 | /* dlerror -- Return error detail for failing <dlfcn.h> functions. |
2 | Copyright (C) 1995 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library 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 the GNU C Library; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <link.h> | |
21 | #include <dlfcn.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <stdlib.h> | |
25 | ||
26 | static int _dl_last_errcode; | |
27 | static const char *_dl_last_errstring; | |
28 | ||
29 | char * | |
30 | dlerror (void) | |
31 | { | |
32 | char *ret; | |
33 | ||
34 | if (! _dl_last_errstring) | |
35 | return NULL; | |
36 | ||
37 | if (_dl_last_errcode) | |
38 | { | |
39 | static char *buf; | |
40 | if (buf) | |
41 | { | |
42 | free (buf); | |
43 | buf = NULL; | |
44 | } | |
45 | if (asprintf (&buf, "%s: %s", | |
46 | _dl_last_errstring, strerror (_dl_last_errcode)) == -1) | |
47 | return NULL; | |
48 | else | |
49 | ret = buf; | |
50 | } | |
51 | else | |
52 | ret = (char *) _dl_last_errstring; | |
53 | ||
54 | /* Reset the error indicator. */ | |
55 | _dl_last_errstring = NULL; | |
56 | return ret; | |
57 | } | |
58 | ||
59 | int | |
60 | _dlerror_run (void (*operate) (void)) | |
61 | { | |
62 | _dl_last_errcode = _dl_catch_error (&_dl_last_errstring, operate); | |
63 | return _dl_last_errstring != NULL; | |
64 | } |