1df930be7Sderaadt /*
2df930be7Sderaadt * Copyright (c) 1983, 1993
3df930be7Sderaadt * The Regents of the University of California. All rights reserved.
4df930be7Sderaadt *
5df930be7Sderaadt * Redistribution and use in source and binary forms, with or without
6df930be7Sderaadt * modification, are permitted provided that the following conditions
7df930be7Sderaadt * are met:
8df930be7Sderaadt * 1. Redistributions of source code must retain the above copyright
9df930be7Sderaadt * notice, this list of conditions and the following disclaimer.
10df930be7Sderaadt * 2. Redistributions in binary form must reproduce the above copyright
11df930be7Sderaadt * notice, this list of conditions and the following disclaimer in the
12df930be7Sderaadt * documentation and/or other materials provided with the distribution.
13*6580fee3Smillert * 3. Neither the name of the University nor the names of its contributors
14df930be7Sderaadt * may be used to endorse or promote products derived from this software
15df930be7Sderaadt * without specific prior written permission.
16df930be7Sderaadt *
17df930be7Sderaadt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18df930be7Sderaadt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19df930be7Sderaadt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20df930be7Sderaadt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21df930be7Sderaadt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22df930be7Sderaadt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23df930be7Sderaadt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24df930be7Sderaadt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25df930be7Sderaadt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26df930be7Sderaadt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27df930be7Sderaadt * SUCH DAMAGE.
28df930be7Sderaadt */
29df930be7Sderaadt
30df930be7Sderaadt #include <sys/types.h>
31df930be7Sderaadt #include <sys/time.h>
32df930be7Sderaadt #include <sys/resource.h>
33687bf81cSderaadt #include <errno.h>
342a62cd37Smillert #include <limits.h>
35df930be7Sderaadt #include <unistd.h>
36df930be7Sderaadt
37df930be7Sderaadt /*
38330e8b97Smillert * Backwards compatible nice().
39df930be7Sderaadt */
40df930be7Sderaadt int
nice(int incr)412a62cd37Smillert nice(int incr)
42df930be7Sderaadt {
43df930be7Sderaadt int prio;
44df930be7Sderaadt
45df930be7Sderaadt errno = 0;
46df930be7Sderaadt prio = getpriority(PRIO_PROCESS, 0);
47df930be7Sderaadt if (prio == -1 && errno)
48df930be7Sderaadt return (-1);
49330e8b97Smillert prio += incr;
50330e8b97Smillert if (setpriority(PRIO_PROCESS, 0, prio) != 0)
51330e8b97Smillert return (-1);
522a62cd37Smillert /* Valid range for prio is -NZERO to NZERO (inclusive). */
532a62cd37Smillert return (prio < -NZERO ? -NZERO : prio > NZERO ? NZERO : prio);
54df930be7Sderaadt }
55