1 /* brk system call for Linux/i386. 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 24 /* This must be initialized data because commons can't have aliases. */ 25 void *__curbrk attribute_hidden = 0; 26 brk(void * addr)27int brk (void *addr) 28 { 29 void *newbrk; 30 31 { 32 register void *o0 __asm__("%o0") = addr; 33 register int g1 __asm__("%g1") = 17 ; 34 __asm__ ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc"); 35 newbrk = o0; 36 } 37 38 __curbrk = newbrk; 39 40 if (newbrk < addr) 41 { 42 __set_errno (ENOMEM); 43 return -1; 44 } 45 46 return 0; 47 } 48 libc_hidden_def(brk) 49