1 /* brk system call for Linux/x86_64. 2 Copyright (C) 1995, 1996, 2000 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 <http://www.gnu.org/licenses/>. */ 18 19 #include <errno.h> 20 #include <unistd.h> 21 #include <sys/syscall.h> 22 23 /* This must be initialized data because commons can't have aliases. */ 24 void *__curbrk attribute_hidden = 0; 25 brk(void * addr)26int brk(void *addr) 27 { 28 void *newbrk; 29 30 __asm__ ("syscall\n" 31 : "=a" (newbrk) 32 : "0" (__NR_brk), "D" (addr) 33 : "r11", "rcx" 34 ); 35 36 __curbrk = newbrk; 37 38 if (newbrk < addr) { 39 __set_errno(ENOMEM); 40 return -1; 41 } 42 43 return 0; 44 } 45 libc_hidden_def(brk) 46