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b231e86ac9
Also stores the result in a thread-local static variable and changes the return value to a const char*. This is already important because Guile creates threads and Python can create threads, but with the patch series here: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/176 GDB itself will create threads, too. gdb/ChangeLog: 2019-10-31 Christian Biesinger <cbiesinger@google.com> * configure: Regenerate. * configure.ac: Check for strerror_r. * gdbsupport/common-utils.h (safe_strerror): Change return value to const char * and document that this function is now threadsafe. * gdbsupport/posix-strerror.c (safe_strerror): Make buf thread_local and call strerror_r, if available. * utils.c (perror_string): Update. (print_sys_errmsg): Update. Change-Id: I81048fbaf148035c221c528727f7efe58ba528eb
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Safe version of strerror for POSIX systems for GDB, the GNU debugger.
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Copyright (C) 2006-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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/* Implementation of safe_strerror as defined in common-utils.h. */
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const char *
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safe_strerror (int errnum)
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{
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static thread_local char buf[1024];
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char *msg = nullptr;
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#ifdef HAVE_STRERROR_R
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# if !__GLIBC__ || ((_POSIX_C_SOURCE >= 200112L) && ! _GNU_SOURCE)
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/* Glibc has two different, incompatible versions of strerror_r. */
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if (strerror_r (errnum, buf, sizeof (buf)) == 0)
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msg = buf;
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# else
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msg = strerror_r (errnum, buf, sizeof (buf));
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# endif
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#else
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msg = strerror (errnum);
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#endif
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if (msg == nullptr)
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{
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xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
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msg = buf;
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}
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return (msg);
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}
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