/* 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; libc_hidden_proto(brk) int brk (void *addr) { void *__unbounded newbrk, *__unbounded scratch; __asm__ ("movl %%ebx, %1\n" /* Save %ebx in scratch register. */ "movl %3, %%ebx\n" /* Put ADDR in %ebx to be syscall arg. */ "int $0x80 # %2\n" /* Perform the system call. */ "movl %1, %%ebx\n" /* Restore %ebx from scratch register. */ : "=a" (newbrk), "=r" (scratch) : "0" (__NR_brk), "g" (__ptrvalue (addr))); __curbrk = newbrk; if (newbrk < addr) { __set_errno (ENOMEM); return -1; } return 0; } libc_hidden_def(brk)