/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/statfs.h>
#include <sys/mount.h>
#include "proc_fs.h"

#ifdef LOSCFG_KERNEL_TRACE
#include "los_trace.h"
static int KernelTraceProcFill(struct SeqBuf *m, void *v)
{
    (void)v;
    if (m == NULL) {
        return -LOS_EPERM;
    }

    if (m->buf == NULL) {
        m->buf = (char *)LOS_TraceBufDataGet(&(m->size), &(m->count));
    }
    return 0;
}

static const struct ProcFileOperations KERNEL_TRACE_PROC_FOPS = {
    .read       = KernelTraceProcFill,
};
#endif

void ProcKernelTraceInit(void)
{
#ifdef LOSCFG_KERNEL_TRACE
    struct ProcDirEntry *pde = CreateProcEntry("ktrace", 0, NULL);
    if (pde == NULL) {
        PRINT_ERR("create /proc/ktrace error!\n");
        return;
    }

    pde->procFileOps = &KERNEL_TRACE_PROC_FOPS;
#endif
}

