技術標籤：函式指標

函式指標

• 1.函式指標

1.函式指標

/********************************
*函式指標
********************************/

#include <stdio.h>

static int first_drv_open()
{
    printf("first_drv_open\n");
    return 0;
}

static int first_drv_read()
{
    printf("first_drv_read\n");
    return
 
 0;
}

struct file_operations_imitative {
        int       (*open) ();
        int       (*read) ();
        int       (*write) ();
};

int Func();   /*宣告一個函式*/
int (*p) ();  /*定義一個函式指標*/

int main()
{
    /**instance analysis1 簡單的例子**/
    p = Func;          /*將Func函式的首地址賦給指標變數p*/
    p();

    /**instance analysis1 根據核心仿寫**/
 

    struct file_operations_imitative my_operation;
    my_operation.open = first_drv_open;
    my_operation.read = first_drv_read;

    my_operation.open();
    my_operation.read();

    return 0;
}

int Func()
{
    printf("%s %d\n",__FUNCTION__, __LINE__);
    return 0;
}