關於linux decice drivers 中open的問題

[akdsy]

代碼: 選擇全部

int scull_open(struct inode *inode, struct file *filp)

{

    struct scull_dev *dev; /* device information */

    dev = container_of(inode->i_cdev, struct scull_dev, cdev);

    filp->private_data = dev; /* for other methods */

    /* now trim to 0 the length of the device if open was write-only */

    if ( (filp->f_flags & O_ACCMODE) =  = O_WRONLY) {

        scull_trim(dev); /* ignore errors */

    }

    return 0;          /* success */

}


以上是linux device drivers裡,所給得code
可是呢,我現在不知要如何去測試他是否是正確的
請問要如何寫測試呢？

感謝您的回答....

[kotzen]

代碼: 選擇全部

int scull_open(struct inode *inode, struct file *filp)

{

    struct scull_dev *dev; /* device information */

    dev = container_of(inode->i_cdev, struct scull_dev, cdev);

    filp->private_data = dev; /* for other methods */

    /* now trim to 0 the length of the device if open was write-only */

    if ( (filp->f_flags & O_ACCMODE) =  = O_WRONLY) {

        scull_trim(dev); /* ignore errors */

    }

    return 0;          /* success */

}


以上是linux device drivers裡,所給得code
可是呢,我現在不知要如何去測試他是否是正確的
請問要如何寫測試呢？

感謝您的回答....

http://www.oreilly.com.tw/product_linux.php?id=a184
O'Railly網站有範例程式可以下載
下載解開之後
cd scull
make
insmod scull.ko
lsmod 就可以看到scull模組已被載入
想移除的話就用rmmod
have hun!

[giantbicycle]

可再配合撰寫一個 User application去呼叫 scull module提供的 function
ex:
open()
read()
write()
close()