centos man page for call_usermodehelper_exec

CALL_USERMODEHELPER_(9) 					  Module Support					   CALL_USERMODEHELPER_(9)

NAME
       call_usermodehelper_exec - start a usermode application

SYNOPSIS
       int call_usermodehelper_exec(struct subprocess_info * sub_info, int wait);

ARGUMENTS
       sub_info
	   information about the subprocessa

       wait
	   wait for the application to finish and return status. when UMH_NO_WAIT don't wait at all, but you get no useful error back when the
	   program couldn't be exec'ed. This makes it safe to call from interrupt context.

DESCRIPTION
       Runs a user-space application. The application is started asynchronously if wait is not set, and runs as a child of keventd. (ie. it runs
       with full root capabilities).

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   CALL_USERMODEHELPER_(9)