59 lines
1.2 KiB
C
59 lines
1.2 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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*/
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/*
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* Verify that root can provide a negative value to nice()
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* and hence root can decrease the nice value of the process
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* using nice() system call
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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 NICEINC -12
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static void verify_nice(void)
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{
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int new_nice;
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int orig_nice;
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orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
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TEST(nice(NICEINC));
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if (TST_RET != (orig_nice + NICEINC)) {
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tst_res(TFAIL | TTERRNO, "nice(%d) returned %li, expected %i",
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NICEINC, TST_RET, orig_nice + NICEINC);
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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", NICEINC);
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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 != (orig_nice + NICEINC)) {
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tst_res(TFAIL, "Process priority %i, expected %i",
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new_nice, orig_nice + NICEINC);
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return;
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}
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tst_res(TPASS, "nice(%d) passed", NICEINC);
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TEST(nice(-NICEINC));
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if (TST_ERR)
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tst_brk(TBROK | TTERRNO, "nice(-NICEINC) failed");
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}
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static struct tst_test test = {
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.test_all = verify_nice,
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.needs_root = 1,
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};
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