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66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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/* Test that nice() does not incorrectly return 0. */
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static int
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do_test (void)
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{
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int ret;
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const int incr = 10;
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int old;
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/* Discover current nice value. */
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errno = 0;
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old = nice (0);
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if (old == -1 && errno != 0)
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{
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printf ("break: nice(%d) return: %d, %m\n", 0, old);
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return 1;
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}
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/* Nice ourselves up. */
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errno = 0;
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ret = nice (incr);
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if (ret == -1 && errno != 0)
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{
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printf ("break: nice(%d) return: %d, %m\n", incr, ret);
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return 1;
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}
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/* Check for return value being zero when it shouldn't. Cannot simply
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check for expected value since nice values are capped at 2^n-1.
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But we assume that we didn't start at the cap and so should have
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increased some. */
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if (ret <= old)
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{
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printf ("FAIL: retval (%d) of nice(%d) != %d\n", ret, incr, old + incr);
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return 1;
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}
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printf ("PASS: nice(%d) from %d return: %d\n", incr, old, ret);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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