| 1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | static bool __always_fail_morecore = false; |
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| 19 | |
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| 20 | /* Allocate INCREMENT more bytes of data space, |
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| 21 | and return the start of data space, or NULL on errors. |
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| 22 | If INCREMENT is negative, shrink data space. */ |
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| 23 | void * |
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| 24 | __glibc_morecore (ptrdiff_t increment) |
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| 25 | { |
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| 26 | if (__always_fail_morecore) |
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| 27 | return NULL; |
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| 28 | |
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| 29 | void *result = (void *) __sbrk (delta: increment); |
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| 30 | if (result == (void *) -1) |
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| 31 | return NULL; |
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| 32 | |
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| 33 | return result; |
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| 34 | } |
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| 35 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) |
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| 36 | compat_symbol (libc, __glibc_morecore, __default_morecore, GLIBC_2_0); |
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| 37 | #endif |
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| 38 | |
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