[Devel] Prefix / Naming USERCR API

[Sukadev Bhattiprolu]

Prefix / Function names for USERCR API

I guess the long term plan is to export the USERCR funtionality to management
or other applications as a library. We are trying to choose a good prefix for
the USERCR API. 

The current prefix for the API is, which was cooked up on the fly, is
"app_". This prefix is currently used in structures/functions like:

	struct app_checkpoint_args * 
	struct app_restart_args * 
	app_checkpoint()
	app_restart()

In the future we may have additional apis like:

	xxx_freeze()
	xxx_migrate()
	xxx_cr_advise() ?

Kernel api already uses some prefixes like (checkpoint, ckpt_ etc:

	<linux/checkpoint.h>
	<linux/checkpoint_hdr.h>

	struct ckpt_hdr_header
	struct ckpt_hdr

	checkpoint(2)
	restart(2)

	#define RESTART_TASKSELF 0x1
	#define CHECKPOINT_SUBTREE 0x1

Having a prefix would make it easy to identify the API and avoid collision
with other libraries that the application might link against. Eg: the
"pam_" prefixes PAM api.

Having a prefix like "cr_" or "acr_" could cause some redundancy in some
names, like cr_checkpoint(), but is probably ok, like pam_authenticate() ?

So, what would be a good prefix ?

	cr_
		cr_checkpoint.h, libcr.a
		cr_checkpoint() cr_restart() cr_freeze() cr_migrate()
		struct cr_checkpoint_args, struct cr_restart_args
	acr_ 
		Only advantage over 'cr_' is lesser likelihood of collision

		acr_checkpoint.h, libacr.a
		acr_checkpoint() acr_restart() acr_freeze() acr_migrate()
		struct acr_checkpoint_args, struct acr_restart_args

	lxcr_	
		lxcr_checkpoint.h, liblxcr.a 
		lxcr_checkpoint() lxcr_restart() lxcr_freeze() lxcr_migrate()
		struct lxcr_checkpoint_args, struct lxcr_restart_args

Other prefixes or naming suggestions ?

Thanks,

Sukadev
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