1f08c3bdfSopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 2f08c3bdfSopenharmony_ci/* 3f08c3bdfSopenharmony_ci * Copyright (c) International Business Machines Corp., 2001 4f08c3bdfSopenharmony_ci * Ported to LTP: Wayne Boyer 5f08c3bdfSopenharmony_ci * Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz> 6f08c3bdfSopenharmony_ci * Copyright (c) Linux Test Project, 2003-2022 7f08c3bdfSopenharmony_ci */ 8f08c3bdfSopenharmony_ci 9f08c3bdfSopenharmony_ci/*\ 10f08c3bdfSopenharmony_ci * [Description] 11f08c3bdfSopenharmony_ci * 12f08c3bdfSopenharmony_ci * Verify that root can provide a negative value to nice() system call and hence 13f08c3bdfSopenharmony_ci * root can decrease the nice value of the process using nice(). 14f08c3bdfSopenharmony_ci */ 15f08c3bdfSopenharmony_ci 16f08c3bdfSopenharmony_ci#include <unistd.h> 17f08c3bdfSopenharmony_ci#include <errno.h> 18f08c3bdfSopenharmony_ci#include <sys/resource.h> 19f08c3bdfSopenharmony_ci#include "tst_test.h" 20f08c3bdfSopenharmony_ci 21f08c3bdfSopenharmony_ci#define MIN_PRIO -20 22f08c3bdfSopenharmony_ci 23f08c3bdfSopenharmony_cistatic int nice_inc[] = {-1, -12, -50}; 24f08c3bdfSopenharmony_ci 25f08c3bdfSopenharmony_cistatic void verify_nice(unsigned int i) 26f08c3bdfSopenharmony_ci{ 27f08c3bdfSopenharmony_ci int new_nice; 28f08c3bdfSopenharmony_ci int orig_nice; 29f08c3bdfSopenharmony_ci int exp_nice; 30f08c3bdfSopenharmony_ci int inc = nice_inc[i]; 31f08c3bdfSopenharmony_ci int delta; 32f08c3bdfSopenharmony_ci 33f08c3bdfSopenharmony_ci orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0); 34f08c3bdfSopenharmony_ci 35f08c3bdfSopenharmony_ci TEST(nice(inc)); 36f08c3bdfSopenharmony_ci 37f08c3bdfSopenharmony_ci exp_nice = MAX(MIN_PRIO, (orig_nice + inc)); 38f08c3bdfSopenharmony_ci 39f08c3bdfSopenharmony_ci if (TST_RET != exp_nice) { 40f08c3bdfSopenharmony_ci tst_res(TFAIL | TTERRNO, "nice(%d) returned %li, expected %i", 41f08c3bdfSopenharmony_ci inc, TST_RET, exp_nice); 42f08c3bdfSopenharmony_ci return; 43f08c3bdfSopenharmony_ci } 44f08c3bdfSopenharmony_ci 45f08c3bdfSopenharmony_ci if (TST_ERR) { 46f08c3bdfSopenharmony_ci tst_res(TFAIL | TTERRNO, "nice(%d) failed", inc); 47f08c3bdfSopenharmony_ci return; 48f08c3bdfSopenharmony_ci } 49f08c3bdfSopenharmony_ci 50f08c3bdfSopenharmony_ci new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0); 51f08c3bdfSopenharmony_ci 52f08c3bdfSopenharmony_ci if (new_nice != exp_nice) { 53f08c3bdfSopenharmony_ci tst_res(TFAIL, "Process priority %i, expected %i", 54f08c3bdfSopenharmony_ci new_nice, exp_nice); 55f08c3bdfSopenharmony_ci return; 56f08c3bdfSopenharmony_ci } 57f08c3bdfSopenharmony_ci 58f08c3bdfSopenharmony_ci tst_res(TPASS, "nice(%d) passed", inc); 59f08c3bdfSopenharmony_ci 60f08c3bdfSopenharmony_ci delta = orig_nice - exp_nice; 61f08c3bdfSopenharmony_ci TEST(nice(delta)); 62f08c3bdfSopenharmony_ci if (TST_ERR) 63f08c3bdfSopenharmony_ci tst_brk(TBROK | TTERRNO, "nice(%d) failed", delta); 64f08c3bdfSopenharmony_ci} 65f08c3bdfSopenharmony_ci 66f08c3bdfSopenharmony_cistatic struct tst_test test = { 67f08c3bdfSopenharmony_ci .needs_root = 1, 68f08c3bdfSopenharmony_ci .test = verify_nice, 69f08c3bdfSopenharmony_ci .tcnt = ARRAY_SIZE(nice_inc), 70f08c3bdfSopenharmony_ci}; 71