check_h "invalid -a argument: '-42'" -a -42
check_h "invalid -O argument: '-42'" -O -42
check_h "invalid -s argument: '-42'" -s -42
+check_h "invalid -s argument: '1073741824'" -s 1073741824
check_h "invalid -I argument: '5'" -I 5
+cat > "$EXP" << '__EOF__'
+strace: must have PROG [ARGS] or -p PID
+Try 'strace -h' for more information.
+__EOF__
+../zeroargc "$strace_exp" /bin/true 2> "$LOG" &&
+ dump_log_and_fail_with \
+ 'zeroargc strace failed to handle the error properly'
+match_diff "$LOG" "$EXP" ||
+ dump_log_and_fail_with \
+ 'zeroargc strace failed to print expected diagnostics'
+
if [ -n "${UID-}" ]; then
if [ "${UID-}" = 0 ]; then
umsg="Cannot find user ':nosuchuser:'"