1# $FreeBSD$ 2# Try to divide the smallest integer by -1. 3# On amd64 this causes SIGFPE, so make sure the shell checks. 4 5# Calculate the minimum possible value, assuming two's complement and 6# a certain interpretation of overflow when shifting left. 7minint=1 8while [ $((minint <<= 1)) -gt 0 ]; do 9 : 10done 11v=$( eval ': $((minint / -1))' 2>&1 >/dev/null) 12[ $? -ne 0 ] && [ -n "$v" ] 13