1 /* Safe version of strerror for GDB, the GNU debugger. 2 3 Copyright (C) 2006-2024 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 <string.h> 21 22 /* There are two different versions of strerror_r; one is GNU-specific, the 23 other XSI-compliant. They differ in the return type. This overload lets 24 us choose the right behavior for each return type. We cannot rely on Gnulib 25 to solve this for us because IPA does not use Gnulib but uses this 26 function. */ 27 28 /* Called if we have a XSI-compliant strerror_r. */ 29 ATTRIBUTE_UNUSED static char * 30 select_strerror_r (int res, char *buf) 31 { 32 return res == 0 ? buf : nullptr; 33 } 34 35 /* Called if we have a GNU strerror_r. */ 36 ATTRIBUTE_UNUSED static char * 37 select_strerror_r (char *res, char *) 38 { 39 return res; 40 } 41 42 /* Implementation of safe_strerror as defined in common-utils.h. */ 43 44 const char * 45 safe_strerror (int errnum) 46 { 47 static thread_local char buf[1024]; 48 49 char *res = select_strerror_r (strerror_r (errnum, buf, sizeof (buf)), buf); 50 if (res != nullptr) 51 return res; 52 53 xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum); 54 return buf; 55 } 56