1 /* Change data segment. Linux generic version. 2 Copyright (C) 2020-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <errno.h> 20 #include <unistd.h> 21 #include <sysdep.h> 22 23 /* This must be initialized data because commons can't have aliases. */ 24 void *__curbrk = 0; 25 26 #if HAVE_INTERNAL_BRK_ADDR_SYMBOL 27 /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt 28 to work around different old braindamage in the old Linux ELF dynamic 29 linker. */ weak_alias(__curbrk,___brk_addr)30weak_alias (__curbrk, ___brk_addr) 31 #endif 32 33 int 34 __brk (void *addr) 35 { 36 __curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr); 37 if (__curbrk < addr) 38 { 39 __set_errno (ENOMEM); 40 return -1; 41 } 42 43 return 0; 44 } 45 weak_alias (__brk, brk) 46