derek.holloway
7502bf64a4
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54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* Make free() preserve errno.
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Copyright (C) 2003, 2006, 2009-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* written by Paul Eggert */
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#include <config.h>
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/* Specification. */
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#include <stdlib.h>
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/* A function definition is only needed if HAVE_FREE_POSIX is not defined. */
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#if !HAVE_FREE_POSIX
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# include <errno.h>
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void
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rpl_free (void *p)
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# undef free
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{
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# if defined __GNUC__ && !defined __clang__
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/* An invalid GCC optimization
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<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396>
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would optimize away the assignments in the code below, when link-time
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optimization (LTO) is enabled. Make the code more complicated, so that
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GCC does not grok how to optimize it. */
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int err[2];
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err[0] = errno;
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err[1] = errno;
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errno = 0;
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free (p);
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errno = err[errno == 0];
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# else
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int err = errno;
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free (p);
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errno = err;
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# endif
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}
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#endif
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