process_proc.c

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/*
 * 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"
#include "los_process_pri.h"
//这个太牛了,直接读 taskinfo,注意 SeqBuf 的第一个参数是 char* buf
static int ProcessProcFill(struct SeqBuf *m, void *v)
{
    (void)v;
    (void)OsShellCmdTskInfoGet(OS_ALL_TASK_MASK, m, OS_PROCESS_INFO_ALL);
    return 0;
}
/// 对 /proc/process 各种骚操作,只能读
static const struct ProcFileOperations PROCESS_PROC_FOPS = {
    .read       = ProcessProcFill,//读取操作
};
//创建进程相关信息 /proc/process
void ProcProcessInit(void)
{
    struct ProcDirEntry *pde = CreateProcEntry("process", 0, NULL);//创建 /proc/process
    if (pde == NULL) {
        PRINT_ERR("create /proc/process error!\n");
        return;
    }
 
    pde->procFileOps = &PROCESS_PROC_FOPS;
}