标签：operations FILE v2.0 drv char file printf data first
file_operations 模仿写程序
file_operations 模仿写程序
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* handy sizes */
#define SIZE_1 (1 << 0) //1
#define SIZE_2 (1 << 1) //2
#define SIZE_4 (1 << 2) //4
#define SIZE_8 (1 << 3) //8
#define SIZE_16 (1 << 4) //16
#define SIZE_32 (1 << 5) //32
#define SIZE_64 (1 << 6) //64
#define SIZE_128 (1 << 7) //128
#define SIZE_256 (1 << 8) //256
#define SIZE_512 (1 << 9) //512 /* 512 Not a change, but a change it */
#define SIZE_1024 (1 << 10) //1024
#define SZ_1K 0x00000400
#define SZ_4K 0x00001000
#define SZ_8K 0x00002000
#define SZ_16K 0x00004000
#define SZ_64K 0x00010000
#define SZ_128K 0x00020000
#define SZ_256K 0x00040000
#define SZ_512K 0x00080000
#define SZ_1M 0x00100000
#define SZ_2M 0x00200000
#define SZ_4M 0x00400000
#define SZ_8M 0x00800000
#define SZ_16M 0x01000000
#define SZ_32M 0x02000000
#define SZ_64M 0x04000000
#define SZ_128M 0x08000000
#define SZ_256M 0x10000000
#define SZ_512M 0x20000000
#define SZ_1G 0x40000000
#define SZ_2G 0x80000000
#define SIZE_1 (1 << 0) //1
#define SIZE_2 (1 << 1) //2
#define SIZE_4 (1 << 2) //4
#define SIZE_8 (1 << 3) //8
#define SIZE_16 (1 << 4) //16
#define SIZE_32 (1 << 5) //32
#define SIZE_64 (1 << 6) //64
#define SIZE_128 (1 << 7) //128
#define SIZE_256 (1 << 8) //256
#define SIZE_512 (1 << 9) //512 /* 512 Not a change, but a change it */
#define SIZE_1024 (1 << 10) //1024
#define SIZE_2048 (1 << 11) //2048
#define SIZE_4096 (1 << 12) //4096
#define SIZE_8192 (1 << 13) //8192
#define SIZE_16384 (1 << 14) //16384 /* Truncating from open(O_TRUNC) */
#define SIZE_32768 (1 << 15) //32768
#define SIZE_65536 (1 << 16) //65536
char name[32] = "Version_1.00";
/*
* NOTE:
* read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
* can be called without the big kernel lock held in all filesystems.
*/
struct my_file_operation {
struct module *owner;
char *pName;
FILE *(*open) (const char *filename);
int (*read_) (FILE *r_FILE, char *data);
ssize_t (*write_) (const char *data);
void (*print_hex) (char *buf, int len, const char *name);
};
#if 1
static void PrintHexName(char *buf, int len, const char *name)
{
int i;
printf("%s (len=%d): ",name, len);
for(i = 0; i < len; i ++)
printf("%02x ", buf[i]);
printf("\n");
}
#endif
static FILE * first_drv_open(const char *filename)
{
printf("first_drv_open\n");
FILE *r_FILE = NULL;
r_FILE = fopen(filename, "r");
if(r_FILE == NULL)
{
printf("fopen failed... \n");
return NULL;
}
return r_FILE;
}
static int first_drv_read(FILE *r_FILE, char *data)
{
printf("first_drv_open\n");
int ret = fread(data, 1, 1024, r_FILE);
fclose(r_FILE);
//PrintHexName(data, 1024, "data");
return ret;
}
static ssize_t first_drv_write(const char *data)
{
printf("first_drv_write\n");
return 0;
}
static struct my_file_operation test_fops = {
.pName = name,
.open = first_drv_open,
.read_ = first_drv_read,
.write_ = first_drv_write,
.print_hex = PrintHexName,
};
static int first_drv_init(void)
{
char *r_data = NULL;
FILE *r_file = NULL;
const char filename[256] = "1.txt";
printf("test_fops.pName:%s\n",test_fops.pName);
r_data = (char *)malloc(10*1024*1024);
r_file = test_fops.open(filename);
int len = test_fops.read_(r_file, r_data);
printf("data printf....\n");
test_fops.print_hex(r_data, len, "FC");
return 0;
}
static void first_drv_exit(void)
{
printf("first_drv_exit...\n");
}
int main()
{
printf("first_drv_init... ATTR_KILL_SUID:%d\n",SIZE_256);
first_drv_init();
first_drv_exit();
return 0;
}
标签：operations,FILE,v2.0,drv,char,file,printf,data,first 来源： https://blog.csdn.net/liuqingsongmsdn2014/article/details/120925320
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