簡單字元驅動程式mycdev c

[root@bogon 桌面]#

gedit mycdev.c

#include

#include

#include

#include

#include

#include

module_author("me");

module_license("gpl");

#define mycdev_major 231 /*給定的主裝置號*/

#define mycdev_size 100

static int mycdev_open(struct inode *inode, struct file *fp)

static int mycdev_release(struct inode *inode, struct file *fp)

static ssize_t mycdev_read(struct file *fp, char __user *buf, size_t size, loff_t *pos)

/*

for (i = 0; i < count; i++)

*/

printk("reader: %d bytes was read...\n", count);

return count;

}

static ssize_t mycdev_write(struct file *fp, const char __user *buf, size_t size, loff_t *pos)

/* 填充 mycdev的 file operation 結構*/

static const struct file_operations mycdev_fops =

;

/*模組初始化函式*/

static int __init mycdev_init(void)

else

return 0;

}

/*模組解除安裝函式*/

static void __exit mycdev_exit(void)

module_init(mycdev_init);

module_exit(mycdev_exit);

[root@bogon 桌面]#

gedit makefile

obj-m:=mycdev.o

pwd:=$(shell pwd)

cur_path:=$(shell uname -r)

kernel_path:=/usr/src/kernels/$(cur_path)

all:

make -c $(kernel_path) m=$(pwd) modules

clean:

make -c $(kernel_path) m=$(pwd) clean

[root@bogon 桌面]#

gedit mycdev_test.c

#include

#include

#include

#include

#include

int main()

if (ret = read(testdev, buf, 15) <15)

printf("%s\n", buf);

close(testdev);

return 0;

}

[root@bogon 桌面]#

make

[root@bogon 桌面]#

insmod mycdev.ko

[root@bogon 桌面]#

cat /proc/devices

[root@bogon 桌面]#

mknod /dev/mycdev c 231 0

[root@bogon 桌面]#

chmod 777 /dev/mycdev

[root@bogon 桌面]#

gcc mycdev_test.c -o mycdev_test

[root@bogon 桌面]#

./mycdev_test

[root@bogon 桌面]#

dmesg

0 給主人留下些什麼吧！~~

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