access bash from C program?

[Bill McGonigle]

On Jun 2, 2008, at 12:11, Labitt, Bruce wrote:

> 	a=getrlimit;  //save current setting
> 	ulimit	  // do what I want
> 	setrlimit=a	  // restore setting

I think only sub-processes are going to be affected by your ulimit  
call, so I'm not sure the [get,set]rlimit are even necessary - once  
you exit your user won't be further affected.  But if you think your  
sub-processes might abuse the new ulimit, defensive programming may  
be called for.

If you have to call out with system() because that's your only  
interface into something, some processes will arrange to re-call  
themselves after tweaking something, and test for that. e.g.:

   check for resource
   resource OK?
     no:
       code = system(set resource; call self)
       exit(code)
     yes:
       do important thing here

Ideally, all those types of checks can be done at program start, for  
the sake of state sanity.

-Bill

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