yes you are right, it gives NULL for <pid> directories under proc but I tried changing pid to something else, say /proc/sys and it works. Looks like handling of pid directories is entirely different. I didn't get time to explore on that, will have to dig more into this. Rajat On Wed, Jan 12, 2011 at 12:50 AM, Mauro Romano Trajber <trajber@gmail.com> wrote:
Following your recommendations parent->pde always returns NULL. You know why ? // code... err = kern_path("/proc/1/", LOOKUP_FOLLOW, &path); if (err) { return err; } struct proc_inode *parent = PROC_I(path.dentry->d_inode); struct proc_dir_entry *parent_dir = parent->pde; if (parent_dir == NULL) { printk("parent_dir is NULL\n"); } else { create_proc_entry("SOMEFile", 0644, parent_dir); }
Mauro! On Tue, Jan 11, 2011 at 4:39 AM, Rajat Sharma <fs.rajat@gmail.com> wrote:
Try this: 1. do a path_lookup for parent proc dir e.g. /proc/1234 and get its inode. 2. get proc_inode structure for parent from vfs inode like this: sruct proc_inode *parent = PROC_I(inode). PROC_I is defined in proc_fs.h 3. get parent proc_dir_entry object: struct proc_dir_entry *parent_dir = parent->pde; 4. now you can call: create_proc_entry("SOME file", 0644, parent_dir); 5. or you can create a directory if you want: proc_mkdir("your dir", parent_dir);
hope this helps.
Rajat
On Tue, Jan 11, 2011 at 12:19 AM, Mauro Romano Trajber <trajber@gmail.com> wrote:
I think I found: static const struct pid_entry tgid_base_stuff[] at fs/proc/base.c has all /proc/[pid] entries. But unfortunately it does not use create_proc_entry function, and I'm trying to create a new syscall that creates a new proc_entry for the caller process. Adding a new element in tgid_base_stuff[] makes the things more complicated than simply call a create_proc_entry function. Is there another way to do it ? Mauro Romano Trajber
On Mon, Jan 10, 2011 at 3:18 PM, Mauro Romano Trajber <trajber@gmail.com> wrote:
How can I create a new proc entry under /proc/[pid] ? I using create_proc_entry("SOME_FILE", 0644, NULL /* here goes the pid proc entry */); Is there any way to get PID directory as a parent proc entry ? How ? Thanks, Mauro
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