Merge "Use syscall(2) instead of ioprio_get/ioprio_set."

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/syscall.h>

#include <unistd.h>

#ifdef HAVE_SCHED_H

#include <cutils/iosched_policy.h>

#ifdef HAVE_ANDROID_OS

/* #include <linux/ioprio.h> */

extern int ioprio_set(int which, int who, int ioprio);

extern int ioprio_get(int which, int who);

#include <linux/ioprio.h>

#define __android_unused

#else

#define __android_unused __attribute__((__unused__))

#endif

enum {

    WHO_PROCESS = 1,

    WHO_PGRP,

    WHO_USER,

};

#define CLASS_SHIFT 13

#define IOPRIO_NORM 4

int android_set_ioprio(int pid __android_unused, IoSchedClass clazz __android_unused, int ioprio __android_unused) {

#ifdef HAVE_ANDROID_OS

    if (ioprio_set(WHO_PROCESS, pid, ioprio | (clazz << CLASS_SHIFT))) {

    if (syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, pid, ioprio | (clazz << IOPRIO_CLASS_SHIFT))) {

        return -1;

    }

#endif

#ifdef HAVE_ANDROID_OS

    int rc;

    if ((rc = ioprio_get(WHO_PROCESS, pid)) < 0) {

    if ((rc = syscall(SYS_ioprio_get, IOPRIO_WHO_PROCESS, pid)) < 0) {

        return -1;

    }

    *clazz = (rc >> CLASS_SHIFT);

    *clazz = (rc >> IOPRIO_CLASS_SHIFT);

    *ioprio = (rc & 0xff);

#else

    *clazz = IoSchedClass_NONE;

#endif

    return 0;

}

#endif /* HAVE_SCHED_H */