| 1 | /* Change data segment. Linux generic version. |
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| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <unistd.h> |
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| 21 | #include <sysdep.h> |
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| 22 | #include <brk_call.h> |
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| 23 | |
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| 24 | /* This must be initialized data because commons can't have aliases. */ |
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| 25 | void *__curbrk = 0; |
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| 26 | |
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| 27 | #if HAVE_INTERNAL_BRK_ADDR_SYMBOL |
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| 28 | /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt |
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| 29 | to work around different old braindamage in the old Linux ELF dynamic |
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| 30 | linker. */ |
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| 31 | weak_alias (__curbrk, ___brk_addr) |
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| 32 | #endif |
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| 33 | |
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| 34 | int |
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| 35 | __brk (void *addr) |
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| 36 | { |
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| 37 | __curbrk = __brk_call (addr); |
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| 38 | if (__curbrk < addr) |
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| 39 | { |
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| 40 | __set_errno (ENOMEM); |
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| 41 | return -1; |
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| 42 | } |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | weak_alias (__brk, brk) |
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| 47 | |
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