1 /* 2 ** Copyright 2007-2014, 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 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 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
