07-18-2008
I would build in a logic context so that you can be sure. For example, SIGHUP is a non-zero vector when a process is started. It is good practice to null the vector after one's fork/exec (in the child, of course), obviously to avoid the humiliation of having one's nice daemon code quit when the starter-upper terminates. So, then, your test could be "is my SIGHUP vector NULL?" and process accordingly. Use your OS facilities to good purpose, and let them help identify your context, too.
Last edited by fsahog; 07-18-2008 at 09:25 PM..
Reason: To make it better
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LEARN ABOUT CENTOS
call_usermodehelper_setup
CALL_USERMODEHELPER_(9) Module Support CALL_USERMODEHELPER_(9)
NAME
call_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.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 CALL_USERMODEHELPER_(9)