$truss ssh-keygen -t dsa -f /tmp/bla -N foofoo | & grep urandom
open("/dev/urandom",0x8104,027757763044)         = 3 (0x3)
open("/dev/urandom",0x0,00)                      = 3 (0x3)
open("/dev/urandom",0x0,00)                      = 3 (0x3)