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Date: Thu, 18 Apr 2002 11:48:35 -0700 (PDT)
From: "Randy.Dunlap" <rddunlap@osdl.org>
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To: Anthony Chee <anthony.chee@polyu.edu.hk>
cc: =?iso-8859-1?Q?Peter_W=E4chtler?= <pwaechtler@loewe-komp.de>,
        <linux-kernel@vger.kernel.org>
Subject: Re: read proc entry
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Hi,

Another thing that you could do is use the seq_file
interface for proc-fs.  That should do away with
the EOF/double-read problem.

seq_file is available in kernel 2.4.15 and later.

~Randy

On Sat, 13 Apr 2002, Anthony Chee wrote:

| After I added *eof =1, that message appears two times. How can I reduce it
| only one?
|
| ----- Original Message -----
| From: "Peter W?chtler" <pwaechtler@loewe-komp.de>
| To: "Anthony Chee" <anthony.chee@polyu.edu.hk>
| Cc: <linux-kernel@vger.kernel.org>
| Sent: Saturday, April 13, 2002 9:58 PM
| Subject: Re: read proc entry
|
|
| > Anthony Chee wrote:
| > >
| > > I written the following code in a module
| > >
| > > static struct proc_dir_entry *test_proc;
| > > test_proc = create_proc_read_entry(test_proc, 0444, NULL,
| read_test_proc,
| > > NULL);
| > >
| > > void show_kernel_message() {
| > >     printk("\nkernel test\n");
| > > }
| > >
| > > int read_test_info(char* page, char** start, off_t off, int count, int*
| eof,
| > > void* data) {
| > >     show_kernel_message();
| >
| > I think you have to signal EOF
| >
| > *eof=1;
| >
| > > }
| > >
| > > After I use "cat /proc/test_proc", it is found that there are three
| "kernel
| > > test" messages
| > > appear. Why it happened like this? I expected the message should be
| shown
| > > once.
| > >
| >
| -

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