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 #if defined(__ANDROID__)
27 #define IOPRIO_WHO_PROCESS (1)
28 #define IOPRIO_CLASS_SHIFT (13)
29 #include <sys/syscall.h>
30 #define __android_unused
31 #else
32 #define __android_unused __attribute__((__unused__))
33 #endif
34
android_set_ioprio(int pid __android_unused,IoSchedClass clazz __android_unused,int ioprio __android_unused)35 int android_set_ioprio(int pid __android_unused, IoSchedClass clazz __android_unused, int ioprio __android_unused) {
36 #if defined(__ANDROID__)
37 if (syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, pid, ioprio | (clazz << IOPRIO_CLASS_SHIFT))) {
38 return -1;
39 }
40 #endif
41 return 0;
42 }
43
android_get_ioprio(int pid __android_unused,IoSchedClass * clazz,int * ioprio)44 int android_get_ioprio(int pid __android_unused, IoSchedClass *clazz, int *ioprio) {
45 #if defined(__ANDROID__)
46 int rc;
47
48 if ((rc = syscall(SYS_ioprio_get, IOPRIO_WHO_PROCESS, pid)) < 0) {
49 return -1;
50 }
51
52 *clazz = (rc >> IOPRIO_CLASS_SHIFT);
53 *ioprio = (rc & 0xff);
54 #else
55 *clazz = IoSchedClass_NONE;
56 *ioprio = 0;
57 #endif
58 return 0;
59 }
60