| 1 | /* Safe version of strerror for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2006-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "common-defs.h" |
| 21 | #include "diagnostics.h" |
| 22 | #include <string.h> |
| 23 | |
| 24 | /* There are two different versions of strerror_r; one is GNU-specific, the |
| 25 | other XSI-compliant. They differ in the return type. This overload lets |
| 26 | us choose the right behavior for each return type. We cannot rely on Gnulib |
| 27 | to solve this for us because IPA does not use Gnulib but uses this |
| 28 | function. */ |
| 29 | |
| 30 | /* We only ever use one of the two overloads, so suppress the warning for |
| 31 | an unused function. */ |
| 32 | DIAGNOSTIC_PUSH |
| 33 | DIAGNOSTIC_IGNORE_UNUSED_FUNCTION |
| 34 | |
| 35 | /* Called if we have a XSI-compliant strerror_r. */ |
| 36 | static char * |
| 37 | select_strerror_r (int res, char *buf) |
| 38 | { |
| 39 | return res == 0 ? buf : nullptr; |
| 40 | } |
| 41 | |
| 42 | /* Called if we have a GNU strerror_r. */ |
| 43 | static char * |
| 44 | select_strerror_r (char *res, char *) |
| 45 | { |
| 46 | return res; |
| 47 | } |
| 48 | |
| 49 | DIAGNOSTIC_POP |
| 50 | |
| 51 | /* Implementation of safe_strerror as defined in common-utils.h. */ |
| 52 | |
| 53 | const char * |
| 54 | safe_strerror (int errnum) |
| 55 | { |
| 56 | static thread_local char buf[1024]; |
| 57 | |
| 58 | char *res = select_strerror_r (strerror_r (errnum, buf, sizeof (buf)), buf); |
| 59 | if (res != nullptr) |
| 60 | return res; |
| 61 | |
| 62 | xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum); |
| 63 | return buf; |
| 64 | } |