42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
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/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <hurd.h>
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#include <unistd.h>
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/* Extend the process's data space by INCREMENT.
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If INCREMENT is negative, shrink data space by - INCREMENT.
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Return the address of the start of the new data space, or -1 for errors. */
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void *
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__sbrk (intptr_t increment)
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{
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void *result;
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_brk_lock);
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result = (void *) _hurd_brk;
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if (increment != 0 && _hurd_set_brk (_hurd_brk + increment) < 0)
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result = (void *) -1;
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__mutex_unlock (&_hurd_brk_lock);
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HURD_CRITICAL_END;
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return result;
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}
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libc_hidden_def (__sbrk)
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weak_alias (__sbrk, sbrk)
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