1 |
|
|
/* |
2 |
|
|
* Copyright (c) 1983, 1993 |
3 |
|
|
* The Regents of the University of California. All rights reserved. |
4 |
|
|
* |
5 |
|
|
* Redistribution and use in source and binary forms, with or without |
6 |
|
|
* modification, are permitted provided that the following conditions |
7 |
|
|
* are met: |
8 |
|
|
* 1. Redistributions of source code must retain the above copyright |
9 |
|
|
* notice, this list of conditions and the following disclaimer. |
10 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
11 |
|
|
* notice, this list of conditions and the following disclaimer in the |
12 |
|
|
* documentation and/or other materials provided with the distribution. |
13 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
14 |
|
|
* may be used to endorse or promote products derived from this software |
15 |
|
|
* without specific prior written permission. |
16 |
|
|
* |
17 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
18 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
21 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 |
|
|
* SUCH DAMAGE. |
28 |
|
|
*/ |
29 |
|
|
|
30 |
|
|
#include <sys/types.h> |
31 |
|
|
#include <sys/time.h> |
32 |
|
|
#include <sys/resource.h> |
33 |
|
|
#include <errno.h> |
34 |
|
|
#include <limits.h> |
35 |
|
|
#include <unistd.h> |
36 |
|
|
|
37 |
|
|
/* |
38 |
|
|
* Backwards compatible nice(). |
39 |
|
|
*/ |
40 |
|
|
int |
41 |
|
|
nice(int incr) |
42 |
|
|
{ |
43 |
|
|
int prio; |
44 |
|
|
|
45 |
|
|
errno = 0; |
46 |
|
|
prio = getpriority(PRIO_PROCESS, 0); |
47 |
|
|
if (prio == -1 && errno) |
48 |
|
|
return (-1); |
49 |
|
|
prio += incr; |
50 |
|
|
if (setpriority(PRIO_PROCESS, 0, prio) != 0) |
51 |
|
|
return (-1); |
52 |
|
|
/* Valid range for prio is -NZERO to NZERO (inclusive). */ |
53 |
|
|
return (prio < -NZERO ? -NZERO : prio > NZERO ? NZERO : prio); |
54 |
|
|
} |