projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /* |
| 2 | * Copyright (c) 1983, 1993 | |
| e9ce8d39 A |
3 | * The Regents of the University of California. All rights reserved. |
| 4 | * | |
| e9ce8d39 A |
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. | |
| e9ce8d39 A |
13 | * 4. 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 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 9385eb3d | 31 | static char sccsid[] = "@(#)nice.c 8.1 (Berkeley) 6/4/93"; |
| e9ce8d39 | 32 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 33 | #include <sys/cdefs.h> |
| 1f2f436a | 34 | __FBSDID("$FreeBSD: src/lib/libc/gen/nice.c,v 1.4 2007/01/09 00:27:54 imp Exp $"); |
| e9ce8d39 | 35 | |
| 5b2abdfb | 36 | #include <sys/types.h> |
| 9385eb3d A |
37 | #include <sys/time.h> |
| 38 | #include <sys/resource.h> | |
| 39 | #include <errno.h> | |
| e9ce8d39 | 40 | #include <unistd.h> |
| ad3c9f2a A |
41 | #if __DARWIN_UNIX03 |
| 42 | #include <limits.h> | |
| 43 | #endif /* __DARWIN_UNIX03 */ | |
| 9385eb3d A |
44 | /* |
| 45 | * Backwards compatible nice. | |
| 46 | */ | |
| e9ce8d39 | 47 | int |
| 9385eb3d A |
48 | nice(incr) |
| 49 | int incr; | |
| e9ce8d39 | 50 | { |
| ad3c9f2a | 51 | int prio, rv; |
| 5b2abdfb | 52 | |
| 9385eb3d A |
53 | errno = 0; |
| 54 | prio = getpriority(PRIO_PROCESS, 0); | |
| 55 | if (prio == -1 && errno) | |
| 5b2abdfb | 56 | return (-1); |
| ad3c9f2a A |
57 | #if __DARWIN_UNIX03 |
| 58 | if (prio + incr > NZERO-1) | |
| 59 | incr = NZERO-1-prio; | |
| 60 | #endif /* __DARWIN_UNIX03 */ | |
| 61 | rv = setpriority(PRIO_PROCESS, 0, prio + incr); | |
| 62 | if (rv == -1 && errno == EACCES) | |
| 63 | errno = EPERM; | |
| 64 | return (rv == -1) ? rv : getpriority(PRIO_PROCESS, 0); | |
| e9ce8d39 | 65 | } |