call_usermodehelper_pipe — call a usermode helper process with a pipe stdin
int call_usermodehelper_pipe
(char * path, char ** argv, char ** envp, struct file ** filp);
path to usermode executable
arg vector for process
environment for process
set to the write-end of a pipe
This is a simple wrapper which executes a usermode-helper function with a pipe as stdin. It is implemented entirely in terms of lower-level call_usermodehelper_* functions.