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glibc/posix/tst-nice.c
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/* Copyright (C) 2003-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <stdio.h> | |
#include <unistd.h> | |
/* Test that nice() does not incorrectly return 0. */ | |
static int | |
do_test (void) | |
{ | |
int ret; | |
const int incr = 10; | |
int old; | |
/* Discover current nice value. */ | |
errno = 0; | |
old = nice (0); | |
if (old == -1 && errno != 0) | |
{ | |
printf ("break: nice(%d) return: %d, %m\n", 0, old); | |
return 1; | |
} | |
/* Nice ourselves up. */ | |
errno = 0; | |
ret = nice (incr); | |
if (ret == -1 && errno != 0) | |
{ | |
printf ("break: nice(%d) return: %d, %m\n", incr, ret); | |
return 1; | |
} | |
/* Check for return value being zero when it shouldn't. Cannot simply | |
check for expected value since nice values are capped at 2^n-1. | |
But we assume that we didn't start at the cap and so should have | |
increased some. */ | |
if (ret <= old) | |
{ | |
printf ("FAIL: retval (%d) of nice(%d) != %d\n", ret, incr, old + incr); | |
return 1; | |
} | |
/* BZ #18086. Make sure we don't reset errno. */ | |
errno = EBADF; | |
nice (0); | |
if (errno != EBADF) | |
{ | |
printf ("FAIL: errno = %i, but wanted EBADF (%i)\n", errno, EBADF); | |
return 1; | |
} | |
printf ("PASS: nice(%d) from %d return: %d\n", incr, old, ret); | |
return 0; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |