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b168057a | 1 | /* Copyright (C) 1992-2015 Free Software Foundation, Inc. |
478b92f0 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
478b92f0 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
478b92f0 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <unistd.h> | |
20 | #include <sys/resource.h> | |
21 | ||
22 | /* Increment the scheduling priority of the calling process by INCR. | |
23 | The superuser may use a negative INCR to decrement the priority. */ | |
24 | int | |
6a7a8b22 | 25 | nice (int incr) |
28f540f4 RM |
26 | { |
27 | int save; | |
28 | int prio; | |
6a7a8b22 | 29 | int result; |
28f540f4 RM |
30 | |
31 | /* -1 is a valid priority, so we use errno to check for an error. */ | |
32 | save = errno; | |
c4029823 | 33 | __set_errno (0); |
28f540f4 RM |
34 | prio = getpriority (PRIO_PROCESS, 0); |
35 | if (prio == -1) | |
36 | { | |
37 | if (errno != 0) | |
38 | return -1; | |
39 | else | |
c4029823 | 40 | __set_errno (save); |
28f540f4 RM |
41 | } |
42 | ||
a334319f | 43 | result = setpriority (PRIO_PROCESS, 0, prio + incr); |
ad2a3c07 UD |
44 | if (result == -1) |
45 | { | |
46 | if (errno == EACCES) | |
47 | errno = EPERM; | |
48 | return -1; | |
49 | } | |
50 | return getpriority (PRIO_PROCESS, 0); | |
28f540f4 | 51 | } |