Hi,

I've created my own /proc entries using linprocfs.c with read and write permissions like this " pfs_create_file(root,"EXAMPLE",&myfunc,NULL,NULL,PFS_RDWR); "

and I've associated my own filler function as follows .

static int myfunc(PFS_FILL_ARGS) { printf(" in myfunc() .....\n"); if(uio->uio_rw ==UIO_WRITE) printf(" write request \n"); else printf(" read request \n"); sbuf_printf(sb, " myfunc function called\n"); printf(" exiting from myfunc() .....\n"); return 0; }

Please read the above statements . When I run "cat /proc/EXAMPLE" I'll get the follwing o/p on the screen .

OUTPUT:

in myfunc() ..... read request exiting from myfunc() ..... myfunc function called in myfunc() ..... read request exiting from myfunc() .....

Even though I'm checking the operation that is requested with the conditional statements if (uio->uiorw==UIO_WRITE) and when I run "echo 0 > /proc/EXAMPLE " I'm getting the following error

ERROR: /proc/EXAMPLE : Operation not supported

The same error is coming even for process related " ctl " files as well when I run "echo attach /proc/12/ctl "

Please tell me the reason and solution for this .