I want to use the route(8) (or an equivalent command) invoked from
a program that adds and removes static routes.  I had been intending
to look at the route(8) exit(2) value from the my program to
determine if the route was successfully added or not.  However, it
seems as though short of getting the arguments wrong and exiting
with a usage error, route(8) always exits 0 (via a return 0 in
main())

Is there a workaround for this behavior so I can invoke add and
remove static routes from my program?  I would prefer *not* doing
a popen(3), and reading the route(8) output.

Thanks,
	-Tad

For example, I add a route through gw 192.168.168.4:

	# route add -net 192.168.1.0 192.168.168.4
	add net 192.168.1.0: gateway 192.168.168.4


Then I try to add the same destination via different (192.168.168.5) gw:

	# if route add -net 192.168.1.0 192.168.168.5 ; then
	>	echo route add ok
	> else
	> 	echo route add failed
	> fi
	writing to routing socket: File exists
	add net 192.168.1.0: gateway 192.168.168.5: Bad file descriptor
	route add ok

The shell script thinks route added the route successfully, but further
examination of the routing table shows that not to be true:

	# route show
	Routing tables

	Internet:
	Destination      Gateway            Flags 
	default          192.168.168.3      UG     
	192.168.1.0      192.168.168.4      UG     
	192.168.168.0    link#1             U      
	192.168.168.3    link#1             UH     
	192.168.168.4    0:b0:d0:b0:1:fa    UH     
	192.168.168.5    link#1             UH     
	192.168.168.18   0:b0:d0:ab:1a:30   UH     
	192.168.168.142  0:19:22:33:48:63   UH     
	#