CALL_USERMODEHELPER_(9) Module Support CALL_USERMODEHELPER_(9)NAMEcall_usermodehelper_setup - prepare to call a usermode helper
SYNOPSIS
struct subprocess_info * call_usermodehelper_setup(char * path,
char ** argv,
char ** envp,
gfp_t gfp_mask,
int (*init) (struct subprocess_info *info, struct cred *new),
void (*cleanup) (struct subprocess_info *info),
void * data);
ARGUMENTS
path
path to usermode executable
argv
arg vector for process
envp
environment for process
gfp_mask
gfp mask for memory allocation
init
an init function
cleanup
a cleanup function
data
arbitrary context sensitive data
DESCRIPTION
Returns either NULL on allocation failure, or a subprocess_info
structure. This should be passed to call_usermodehelper_exec to exec
the process and free the structure.
The init function is used to customize the helper process prior to
exec. A non-zero return code causes the process to error out, exit, and
return the failure to the calling process
The cleanup function is just before ethe subprocess_info is about to be
freed. This can be used for freeing the argv and envp. The Function
must be runnable in either a process context or the context in which
call_usermodehelper_exec is called.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 CALL_USERMODEHELPER_(9)
