/* brk system call for Linux/i386. Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <unistd.h> #include <sys/syscall.h> /* This must be initialized data because commons can't have aliases. */ void *__curbrk attribute_hidden = 0; int brk(void *addr) { void *newbrk; /* %ebx is used in PIC code, need to save/restore it manually. * gcc won't do it for us if we will request it in constraints */ __asm__("pushl %%ebx\n" "movl %2, %%ebx\n" "int $0x80\n" "popl %%ebx\n" : "=a" (newbrk) : "0" (__NR_brk), "g" (addr) ); __curbrk = newbrk; if (newbrk < addr) { __set_errno(ENOMEM); return -1; } return 0; } libc_hidden_def(brk)