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Dear Daniel：
I think the most important
reason is: the file your said is in the user-space, while the driver code is
running in the kernel-space.For the security reason, the direct acess between
these two space is forbidden.
The solution to your
problem:
1. use the /proc or /sys
filesystem
2. printk
3. write a user-space program
to read these data from driver and then save them to a
file 2010-01-15
snoppy1314
发件人： Daniel (Youngwhan) Song
发送时间： 2010-01-15 09:53:44
收件人： kernelnewbies
抄送：
主题： Why the linux does not allow
the access to a file in the devicedriver?
Hi,
Could somebody help me to understand the reason why the linux kernel does not allow the access to a file in the device driver? For example, for debugging purpose, if a device driver want to log some data in a file by using open/write/read method like in user application, how a driver can access to a file in a specific filesystem? Any comment or docs or web pages would be appreciated. Thank you, Dan. |
