1 /* 2 * Copyright (c) 2017 Cyril Hrubis <chrubis (at) suse.cz> 3 * 4 * This program is free software: you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation, either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <unistd.h> 19 #include <stdint.h> 20 #include <inttypes.h> 21 #include <errno.h> 22 23 #include "tst_test.h" 24 25 void verify_brk(void) 26 { 27 uintptr_t cur_brk, new_brk; 28 uintptr_t inc = getpagesize() * 2 - 1; 29 unsigned int i; 30 31 cur_brk = (uintptr_t)sbrk(0); 32 33 for (i = 0; i < 33; i++) { 34 switch (i % 3) { 35 case 0: 36 new_brk = cur_brk + inc; 37 break; 38 case 1: 39 new_brk = cur_brk; 40 break; 41 case 2: 42 new_brk = cur_brk - inc; 43 break; 44 } 45 46 TEST(brk((void *)new_brk)); 47 48 if (TEST_RETURN == -1) { 49 tst_res(TFAIL | TERRNO, "brk() failed"); 50 return; 51 } 52 53 cur_brk = (uintptr_t)sbrk(0); 54 55 if (cur_brk != new_brk) { 56 tst_res(TFAIL, 57 "brk() failed to set address have %p expected %p", 58 (void *)cur_brk, (void *)new_brk); 59 return; 60 } 61 62 /* Try to write to the newly allocated heap */ 63 if (i % 3 == 0) 64 *((char *)cur_brk) = 0; 65 } 66 67 tst_res(TPASS, "brk() works fine"); 68 } 69 70 static struct tst_test test = { 71 .test_all = verify_brk, 72 }; 73
