簡單字元驅動程式

mycdev.c:

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

module_license("gpl");

#define mycdev_major 231     //cat /proc/devices檢視系統中未使用的字元裝置主裝置號

#define mycdev_size 1024

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)

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)

static const struct file_operations mycdev_fops =

;static int __init mycdev_init(void)

else

return 0;

}static void __exit mycdev_exit(void)

module_init(mycdev_init);

module_exit(mycdev_exit);

先編譯mycdev.c模組，並把mycdev.ko插入核心。

然後建立裝置檔案結點sudo mknod /dev/mycdev c 231 0；（231的**看**中的注釋）

修改裝置檔案許可權：sudo chmod 777 /dev/mycdev.

編寫使用者態測試程式：test.c

#include

#include

#include

#include

#include

int main()

if(ret = read(testdev, buf, 10) < 10)

for (i=0; i<10; i++)

printf("\n");

close(testdev);

return 0;

}使用者態測試程式結果：

dmesg結果：

mycdev.ko解除安裝後使用者態測試程式：

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 defin...

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