59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
|
|
** Copyright 2007, The Android Open Source Project
|
|
**
|
|
** Licensed under the Apache License, Version 2.0 (the "License");
|
|
** you may not use this file except in compliance with the License.
|
|
** You may obtain a copy of the License at
|
|
**
|
|
** http://www.apache.org/licenses/LICENSE-2.0
|
|
**
|
|
** Unless required by applicable law or agreed to in writing, software
|
|
** distributed under the License is distributed on an "AS IS" BASIS,
|
|
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
** See the License for the specific language governing permissions and
|
|
** limitations under the License.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <cutils/iosched_policy.h>
|
|
|
|
#ifdef HAVE_ANDROID_OS
|
|
#include <linux/ioprio.h>
|
|
#include <sys/syscall.h>
|
|
#define __android_unused
|
|
#else
|
|
#define __android_unused __attribute__((__unused__))
|
|
#endif
|
|
|
|
int android_set_ioprio(int pid __android_unused, IoSchedClass clazz __android_unused, int ioprio __android_unused) {
|
|
#ifdef HAVE_ANDROID_OS
|
|
if (syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, pid, ioprio | (clazz << IOPRIO_CLASS_SHIFT))) {
|
|
return -1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int android_get_ioprio(int pid __android_unused, IoSchedClass *clazz, int *ioprio) {
|
|
#ifdef HAVE_ANDROID_OS
|
|
int rc;
|
|
|
|
if ((rc = syscall(SYS_ioprio_get, IOPRIO_WHO_PROCESS, pid)) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
*clazz = (rc >> IOPRIO_CLASS_SHIFT);
|
|
*ioprio = (rc & 0xff);
|
|
#else
|
|
*clazz = IoSchedClass_NONE;
|
|
*ioprio = 0;
|
|
#endif
|
|
return 0;
|
|
}
|