returning text from a system call
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I'm guessing this is an exercise or something - I'm not sure exactly what you're trying to accomplish with this - but if you created a new system call, all you'd likely need to do is to have the caller pass in a pointer to a buffer, as well as the buffer size, with the system call, then just copy the data into/out of the buffer using copy_to_user and copy_from_user.
----- Original Message -----
From: "so usp" <[email protected]>
Newsgroups: fa.linux.kernel
To: <[email protected]>
Sent: Monday, June 21, 2004 2:28 PM
Subject: returning text from a system call
Quoted 26 lines
Hi,
I'm implementing a system call, and I want to return information (text data) to the user without using the
/var/log/messages(using the printk function). I've been thinking about writing in a file, but I really don't know how to manipulate files in kernel mode. The text could be returned to the command line as well, but I either don't know how to do that. Does anybody could help me how to return text (both ways would be good) from a system call?Thanks, and sorry for the English.
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