此章節說明如何在核心端程式使用 mcm_lklib_run 傳遞資料給內部模組以及從內部模組回傳資料.

範例程式顯示的訊息必須使用系統指令 dmesg 觀看.

外部程式部分

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "mcm_lib/mcm_lheader/mcm_type.h"
#include "mcm_lib/mcm_lheader/mcm_size.h"
#include "mcm_lib/mcm_lheader/mcm_connect.h"
#include "mcm_lib/mcm_lheader/mcm_return.h"
#include "mcm_lib/mcm_lheader/mcm_data_exinfo_auto.h"
#include "mcm_lib/mcm_lklib/mcm_lklib_api.h"

#define DMSG(msg_fmt, msgs...) \
    printk(KERN_INFO "%s(%04u): " msg_fmt "\n", \
           strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__, __LINE__, ##msgs)

static int __init main_init(
    void)
{
    char *path1;
    struct mcm_lklib_lib_t self_lklib;
    char req_data1[128], *rep_data1;
    MCM_DTYPE_USIZE_TD req_len1, rep_len1;
    int req_data2[4], *rep_data2;
    MCM_DTYPE_USIZE_TD req_len2, rep_len2, idx, count;

    self_lklib.socket_path = "@mintcm";
    self_lklib.call_from = MCM_CFROM_KERNEL;
    self_lklib.session_permission = MCM_SPERMISSION_RO;
    self_lklib.session_stack_size = 0;
    if(mcm_lklib_init(&self_lklib) < MCM_RCODE_PASS)
    {
        DMSG("call mcm_lklib_init() fail");
        goto FREE_01;
    }

    // 測試-01 : 字串類型資料.

    path1 = "mcm_module_kernel_data_test_01";
    DMSG("[run] %s", path1);

    snprintf(req_data1, sizeof(req_data1), "kernel-data-%u", 123456789);
    req_len1 = strlen(req_data1) + 1;
    DMSG("send [" MCM_DTYPE_USIZE_PF "][%s]", req_len1, req_data1);

    if(mcm_lklib_run(&self_lklib, path1, &req_data1, req_len1, (void **) &rep_data1, &rep_len1)
                     < MCM_RCODE_PASS)
    {
        DMSG("call mcm_lklib_run(%s) fail", path1);
        goto FREE_02;
    }

    DMSG("recv [" MCM_DTYPE_USIZE_PF "][%s]", rep_len1, rep_data1);
    kfree(rep_data1);

    // 測試-02 : 字節類型資料.

    path1 = "mcm_module_kernel_data_test_02";
    DMSG("[run] %s", path1);

    count = sizeof(req_data2) / sizeof(int);
    for(idx = 0; idx < count; idx++)
        req_data2[idx] = (idx + 1) * 10;

    req_len2 = sizeof(req_data2);

    DMSG("send [" MCM_DTYPE_USIZE_PF "] (" MCM_DTYPE_USIZE_PF ") -", req_len2, count);
    for(idx = 0; idx < count; idx++)
    {
        DMSG("%d", req_data2[idx]);
    }

    if(mcm_lklib_run(&self_lklib, path1, &req_data2, req_len2, (void **) &rep_data2, &rep_len2)
                     < MCM_RCODE_PASS)
    {
        DMSG("call mcm_lklib_run(%s) fail", path1);
        goto FREE_02;
    }

    count = rep_len2 / sizeof(int);
    DMSG("recv [" MCM_DTYPE_USIZE_PF "] (" MCM_DTYPE_USIZE_PF ") -", rep_len2, count);
    for(idx = 0; idx < count; idx++)
    {
        DMSG("%d", rep_data2[idx]);
    }
    kfree(rep_data2);

FREE_02:
    mcm_lklib_exit(&self_lklib);
FREE_01:
    return 0;
}

static void __exit main_exit(
    void)
{
    return;
}

module_init(main_init);
module_exit(main_exit);

MODULE_LICENSE("GPL");

內部模組部分

#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mcm_lib/mcm_lheader/mcm_type.h"
#include "mcm_lib/mcm_lheader/mcm_size.h"
#include "mcm_lib/mcm_lheader/mcm_control.h"
#include "mcm_lib/mcm_lheader/mcm_connect.h"
#include "mcm_lib/mcm_lheader/mcm_return.h"
#include "mcm_lib/mcm_lheader/mcm_debug.h"
#include "mcm_lib/mcm_lheader/mcm_data_exinfo_auto.h"
#include "../mcm_service_handle_define.h"
#include "../mcm_config_handle_extern.h"

#define DMSG(msg_fmt, msgs...) printf("%s(%04u): " msg_fmt "\n", __FILE__, __LINE__, ##msgs)

int mcm_module_kernel_data_test_01(
    struct mcm_service_session_t *this_session)
{
    int fret = MCM_RCODE_MODULE_INTERNAL_ERROR;
    MCM_DTYPE_USIZE_TD tmp_len;
    char *tmp_buf;

    DMSG("string data test :");

    srand(time(NULL));

    // 外部程式傳來的資料.

    DMSG("recv [" MCM_DTYPE_USIZE_PF "][%s]",
         this_session->req_data_len, (char *) this_session->req_data_con);

    // 內部模組要回傳的資料.

    tmp_len = 256;
    tmp_buf = (char *) malloc(tmp_len);
    if(tmp_buf == NULL)
    {
        DMSG("call malloc() fail [%s]", strerror(errno));
        goto FREE_01;
    }

    snprintf(tmp_buf, tmp_len, "internal data %u", rand());
    tmp_len = strlen(tmp_buf) + 1;
    DMSG("send [" MCM_DTYPE_USIZE_PF "][%s]", tmp_len, tmp_buf);

    this_session->rep_data_buf = tmp_buf;
    this_session->rep_data_len = tmp_len;

    fret = MCM_RCODE_PASS;
FREE_01:
    return fret;
}

int mcm_module_kernel_data_test_02(
    struct mcm_service_session_t *this_session)
{
    int fret = MCM_RCODE_MODULE_INTERNAL_ERROR;
    MCM_DTYPE_USIZE_TD tmp_len, idx, count;
    int *tmp_buf;

    DMSG("bytes data test :");

    srand(time(NULL));

    // 外部程式傳來的資料.

    tmp_buf = (int *) this_session->req_data_con;
    count = this_session->req_data_len / sizeof(int);
    DMSG("recv [" MCM_DTYPE_USIZE_PF "] (" MCM_DTYPE_USIZE_PF ") -",
         this_session->req_data_len, count);
    for(idx = 0; idx < count; idx++)
    {
        DMSG("%d", tmp_buf[idx]);
    }

    // 內部模組要回傳的資料.

    count = 6;
    tmp_buf = calloc(count, sizeof(int));
    if(tmp_buf == NULL)
    {
        DMSG("call calloc() fail [%s]", strerror(errno));
        goto FREE_01;
    }
    tmp_len = sizeof(int) * count;

    for(idx = 0; idx < count; idx++)
        tmp_buf[idx] = rand() % 10;

    DMSG("send [" MCM_DTYPE_USIZE_PF "] (" MCM_DTYPE_USIZE_PF ") -", tmp_len, count);
    for(idx = 0; idx < count; idx++)
    {
        DMSG("%d", tmp_buf[idx]);
    }

    this_session->rep_data_buf = tmp_buf;
    this_session->rep_data_len = tmp_len;

    fret = MCM_RCODE_PASS;

FREE_01:
    return fret;
}

01.	範例程式目錄在 mint_cm/usage/example/0503.

02.	下面關於 make 的操作沒有特別註明的話都是在 mint_cm 目錄.

03.	第一次使用, 使用 make example_add KEY=0503 載入範例並編譯.

04.	kernel_app/kernel_app_0503 是範例程式, 必須先在目錄內使用 make all 進行編譯. 載入 kernel_app_0503.ko 就能測試.

05.	先載入 mcm_lklib_api.ko, 接著執行 mcm_daemon, 再載入 kernel_app_0503 做測試.

06.	測試完畢不使用後, 使用 make example_del KEY=0503 將範例移除.

07.

範例程式目錄下的檔案在做完 make example_add 後會複製到真正使用的位置, 要修改做測試的話要改在複製後的. 來源 profile/mcm_data_profile_0503.xml 目地 mint_cm/mcm_build/mcm_data_profile.xml 資料模型範例 有修改要使用 make all 重新編譯 來源 profile/mcm_store_profile_default_0503.txt 目地 mint_cm/mcm_build/mcm_store_profile_default.txt 資料預設值範例 使用 make all 後會再複製到 mint_cm/run 來源 module/mcm_module_0503.c 目地 mint_cm/mcm_daemon/mcm_module 內部模組範例 有修改要使用 make all 重新編譯