| /* |
| * Copyright (C) 2015 Cedric Hnyda ced.hnyda@gmail.com |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Further, this software is distributed without any warranty that it is |
| * free of the rightful claim of any third person regarding infringement |
| * or the like. Any license provided herein, whether implied or |
| * otherwise, applies only to this software file. Patent licenses, if |
| * any, provided herein do not apply to combinations of this program with |
| * other software, or any other product whatsoever. |
| * |
| */ |
| |
| /* |
| * AUTHOR : Cédric Hnyda |
| * DATE STARTED : 06/13/2015 |
| * |
| * Calls getrandom(2), checks that the buffer is filled with random bytes |
| * and expects success. |
| * |
| */ |
| |
| #include "lapi/getrandom.h" |
| #include "lapi/syscalls.h" |
| #include "tst_test.h" |
| |
| static int modes[] = { 0, GRND_RANDOM, GRND_NONBLOCK, |
| GRND_RANDOM | GRND_NONBLOCK }; |
| |
| static int check_content(unsigned char *buf, int nb) |
| { |
| int table[256]; |
| int i, index, max; |
| |
| memset(table, 0, sizeof(table)); |
| |
| max = 6 + nb * 0.2; |
| |
| for (i = 0; i < nb; i++) { |
| index = buf[i]; |
| table[index]++; |
| } |
| |
| for (i = 0; i < nb; i++) { |
| if (max > 0 && table[i] > max) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void verify_getrandom(unsigned int n) |
| { |
| unsigned char buf[256]; |
| |
| memset(buf, 0, sizeof(buf)); |
| |
| do { |
| TEST(tst_syscall(__NR_getrandom, buf, sizeof(buf), modes[n])); |
| } while ((modes[n] & GRND_NONBLOCK) && TEST_RETURN == -1 |
| && TEST_ERRNO == EAGAIN); |
| |
| if (!check_content(buf, TEST_RETURN)) |
| tst_res(TFAIL | TTERRNO, "getrandom failed"); |
| else |
| tst_res(TPASS, "getrandom returned %ld", TEST_RETURN); |
| } |
| |
| static struct tst_test test = { |
| .tcnt = ARRAY_SIZE(modes), |
| .test = verify_getrandom, |
| }; |