On Thu, 5 Oct 2000, George Anzinger wrote:
> Where is the internal interface to procfs documented?
There is no documentation for the -exported- procfs interface as far as
I know. As for internal interfaces, who knows what you are asking...
Here's a rough outline: (maybe somebody should clean this up and stick
it into Documentation/*)
* Drivers without MAJOR /proc interfaces should stick their procfs
files/directories into /proc/driver/*
* Use proc_mkdir to create directories. For symlinks, proc_symlink, for
device nodes, proc_mknod. Note that only proc_mknod takes a permission
(mode_t) argument. If you need special permissions on directories, use
create_proc_entry with S_IFDIR in mode_t arg. Otherwise directories
will be mode 0755.
* Use create_proc_read_entry for your procfs "files." For anything more
complex than simply reading, use create_proc_entry. If you pass '0' for
mode_t, it will have mode 0644 (ie. normal file permissions).
* Use remove_proc_entry for removing entries.
* Pass NULL for the parent dir, if you are based off of /proc root.
* You don't need to keep around pointers to your procfs directories and
files. Just call remove_proc_entry with the correct (full) path,
relative, to procfs root, and the right thing will happen.
Cheesy init example:
if (!proc_mkdir("driver/my_driver", NULL))
/* error */
if (!create_proc_read_entry("driver/my_driver/foo", 0, NULL,
foo_read_proc, NULL))
/* error */
if (!create_proc_read_entry("driver/my_driver/bar", 0, NULL,
bar_read_proc, NULL))
/* error */
Cheesy remove example:
remove_proc_entry ("driver/my_driver/bar", NULL);
remove_proc_entry ("driver/my_driver/foo", NULL);
remove_proc_entry ("driver/my_driver", NULL);
In the above examples, I'm pretty sure that the proc_mkdir call,
and final remove_proc_entry, can be skipped, too....
Jeff
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