| /* 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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) |