| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1992-2016 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 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 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 |
| 25 | nice (int incr) |
| 26 | { |
| 27 | int save; |
| 28 | int prio; |
| 29 | int result; |
| 30 | |
| 31 | /* -1 is a valid priority, so we use errno to check for an error. */ |
| 32 | save = errno; |
| 33 | __set_errno (0); |
| 34 | prio = __getpriority (PRIO_PROCESS, 0); |
| 35 | if (prio == -1) |
| 36 | { |
| 37 | if (errno != 0) |
| 38 | return -1; |
| 39 | } |
| 40 | |
| 41 | result = __setpriority (PRIO_PROCESS, 0, prio + incr); |
| 42 | if (result == -1) |
| 43 | { |
| 44 | if (errno == EACCES) |
| 45 | __set_errno (EPERM); |
| 46 | return -1; |
| 47 | } |
| 48 | |
| 49 | __set_errno (save); |
| 50 | return __getpriority (PRIO_PROCESS, 0); |
| 51 | } |