I am in a kernel module and I want to have the whole process name from a given pid. exactly: I want the line which is hold in /proc/PID/cmdline.
The problem is that task_struct->comm[] is only 15 bytes long and doesn't handle
if a program changes his argv[] manually or via setproctitle(3)...
Any ideas? :)
You could always look at how the kernel does it. You'll see the function:
proc_pid_cmdline(struct task_struct *task, char * buffer)
It's fairly easy to follow but once you have the task_struct for the process you are interested in you use access_process_vm() to slurp the bits you want from mm->arg_start.
