1 /*
2 ** Copyright 2007, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23
24 #include <cutils/iosched_policy.h>
25
26 #ifdef HAVE_ANDROID_OS
27 #include <linux/ioprio.h>
28 #include <sys/syscall.h>
29 #define __android_unused
30 #else
31 #define __android_unused __attribute__((__unused__))
32 #endif
33
android_set_ioprio(int pid __android_unused,IoSchedClass clazz __android_unused,int ioprio __android_unused)34 int android_set_ioprio(int pid __android_unused, IoSchedClass clazz __android_unused, int ioprio __android_unused) {
35 #ifdef HAVE_ANDROID_OS
36 if (syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, pid, ioprio | (clazz << IOPRIO_CLASS_SHIFT))) {
37 return -1;
38 }
39 #endif
40 return 0;
41 }
42
android_get_ioprio(int pid __android_unused,IoSchedClass * clazz,int * ioprio)43 int android_get_ioprio(int pid __android_unused, IoSchedClass *clazz, int *ioprio) {
44 #ifdef HAVE_ANDROID_OS
45 int rc;
46
47 if ((rc = syscall(SYS_ioprio_get, IOPRIO_WHO_PROCESS, pid)) < 0) {
48 return -1;
49 }
50
51 *clazz = (rc >> IOPRIO_CLASS_SHIFT);
52 *ioprio = (rc & 0xff);
53 #else
54 *clazz = IoSchedClass_NONE;
55 *ioprio = 0;
56 #endif
57 return 0;
58 }
59