How can i pass content of a file to /proc/

gandil · 01-05-2008, 05:02 AM

I wonder about how can i take input from user and write to a file then pass that file content to /proc/... file.

For example my device file is DFILE under /dev,
user will enter

Quote:

echo "this is my try" > /dev/DFILE

After that user will enter

Quote:

cat /proc/NEWD

Then user should saw what we write.

Any idea?

druuna · 01-05-2008, 05:40 AM

Hi,

Looks like you are looking for (named) pipes/fifo's.

Here's an example and here another example.

Hope this helps.

ashok449 · 01-08-2008, 03:35 AM

For this your driver itself needs to create file in /proc directory like

Code:

proc_entry = create_proc_entry( "NEWD", 0644, NULL );

create /proc files in ur driver with the hep of

Code:

#include <linux/proc_fs.h>

static struct proc_dir_entry *proc_entry;

All the best

gandil · 01-11-2008, 07:41 PM

so my question is still unanswered. How can i pass information from /dev/mydev to /proc/mydevice ?

ashok449 · 01-13-2008, 11:43 PM

I mean the driver it self having both Dev node and /proc fs node like

creating /DEV/DFILE node

Code:

devfs_handle=devfs_register(NULL, DFILE , DEVFS_FL_AUTO_DEVNUM,
				    0,0,
				    S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, 
				    &ticfg_fops, &ticfg_dev);

in the same module create /Proc/NEWD node

Code:

proc_entry = create_proc_entry( "NEWD", 0644, NULL );

both these have seperate fileoperations ,

proc file operations

Code:

   proc_entry->read_proc = newd_read;
      proc_entry->write_proc = newd_write;

just use that file (file structure) to communicate in both ways.

Ashok Athukuri

gandil · 01-15-2008, 07:54 AM

Quote:

Originally Posted by ashok449

I mean the driver it self having both Dev node and /proc fs node like

creating /DEV/DFILE node

Code:

devfs_handle=devfs_register(NULL, DFILE , DEVFS_FL_AUTO_DEVNUM,
				    0,0,
				    S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, 
				    &ticfg_fops, &ticfg_dev);

in the same module create /Proc/NEWD node

Code:

proc_entry = create_proc_entry( "NEWD", 0644, NULL );

both these have seperate fileoperations ,

proc file operations

Code:

   proc_entry->read_proc = newd_read;
      proc_entry->write_proc = newd_write;

just use that file (file structure) to communicate in both ways.

Ashok Athukuri

Thank you. now it is clear

gandil · 01-27-2008, 03:44 PM

thanks for all messages