71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* Ported to LTP: Wayne Boyer
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* Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
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* Copyright (c) Linux Test Project, 2003-2022
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*/
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/*\
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* [Description]
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*
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* Verify that root can provide a negative value to nice() system call and hence
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* root can decrease the nice value of the process using nice().
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <sys/resource.h>
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#include "tst_test.h"
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#define MIN_PRIO -20
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static int nice_inc[] = {-1, -12, -50};
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static void verify_nice(unsigned int i)
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{
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int new_nice;
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int orig_nice;
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int exp_nice;
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int inc = nice_inc[i];
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int delta;
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orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
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TEST(nice(inc));
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exp_nice = MAX(MIN_PRIO, (orig_nice + inc));
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if (TST_RET != exp_nice) {
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tst_res(TFAIL | TTERRNO, "nice(%d) returned %li, expected %i",
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inc, TST_RET, exp_nice);
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return;
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}
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if (TST_ERR) {
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tst_res(TFAIL | TTERRNO, "nice(%d) failed", inc);
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return;
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}
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new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
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if (new_nice != exp_nice) {
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tst_res(TFAIL, "Process priority %i, expected %i",
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new_nice, exp_nice);
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return;
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}
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tst_res(TPASS, "nice(%d) passed", inc);
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delta = orig_nice - exp_nice;
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TEST(nice(delta));
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if (TST_ERR)
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tst_brk(TBROK | TTERRNO, "nice(%d) failed", delta);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.test = verify_nice,
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.tcnt = ARRAY_SIZE(nice_inc),
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};
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