| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (c) International Business Machines Corp., 2001 |
| * Ported to LTP: Wayne Boyer |
| * Copyright (c) 2016 Cyril Hrubis <[email protected]> |
| */ |
| |
| /* |
| * Verify that root can provide a negative value to nice() |
| * and hence root can decrease the nice value of the process |
| * using nice() system call |
| */ |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/resource.h> |
| #include "tst_test.h" |
| |
| #define NICEINC -12 |
| |
| static void verify_nice(void) |
| { |
| int new_nice; |
| int orig_nice; |
| |
| orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0); |
| |
| TEST(nice(NICEINC)); |
| |
| if (TST_RET != (orig_nice + NICEINC)) { |
| tst_res(TFAIL | TTERRNO, "nice(%d) returned %li, expected %i", |
| NICEINC, TST_RET, orig_nice + NICEINC); |
| return; |
| } |
| |
| if (TST_ERR) { |
| tst_res(TFAIL | TTERRNO, "nice(%d) failed", NICEINC); |
| return; |
| } |
| |
| new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0); |
| |
| if (new_nice != (orig_nice + NICEINC)) { |
| tst_res(TFAIL, "Process priority %i, expected %i", |
| new_nice, orig_nice + NICEINC); |
| return; |
| } |
| |
| tst_res(TPASS, "nice(%d) passed", NICEINC); |
| |
| TEST(nice(-NICEINC)); |
| if (TST_ERR) |
| tst_brk(TBROK | TERRNO, "nice(-NICEINC) failed"); |
| } |
| |
| static struct tst_test test = { |
| .test_all = verify_nice, |
| .needs_root = 1, |
| }; |
