1 | /* Copyright (C) 2003-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stdio.h> |
20 | #include <unistd.h> |
21 | |
22 | |
23 | /* Test that nice() does not incorrectly return 0. */ |
24 | static int |
25 | do_test (void) |
26 | { |
27 | int ret; |
28 | const int incr = 10; |
29 | int old; |
30 | |
31 | /* Discover current nice value. */ |
32 | errno = 0; |
33 | old = nice (inc: 0); |
34 | if (old == -1 && errno != 0) |
35 | { |
36 | printf (format: "break: nice(%d) return: %d, %m\n" , 0, old); |
37 | return 1; |
38 | } |
39 | |
40 | /* Nice ourselves up. */ |
41 | errno = 0; |
42 | ret = nice (inc: incr); |
43 | if (ret == -1 && errno != 0) |
44 | { |
45 | printf (format: "break: nice(%d) return: %d, %m\n" , incr, ret); |
46 | return 1; |
47 | } |
48 | |
49 | /* Check for return value being zero when it shouldn't. Cannot simply |
50 | check for expected value since nice values are capped at 2^n-1. |
51 | But we assume that we didn't start at the cap and so should have |
52 | increased some. */ |
53 | if (ret <= old) |
54 | { |
55 | printf (format: "FAIL: retval (%d) of nice(%d) != %d\n" , ret, incr, old + incr); |
56 | return 1; |
57 | } |
58 | |
59 | /* BZ #18086. Make sure we don't reset errno. */ |
60 | errno = EBADF; |
61 | nice (inc: 0); |
62 | if (errno != EBADF) |
63 | { |
64 | printf (format: "FAIL: errno = %i, but wanted EBADF (%i)\n" , errno, EBADF); |
65 | return 1; |
66 | } |
67 | |
68 | |
69 | printf (format: "PASS: nice(%d) from %d return: %d\n" , incr, old, ret); |
70 | return 0; |
71 | } |
72 | |
73 | #define TEST_FUNCTION do_test () |
74 | #include "../test-skeleton.c" |
75 | |