| #!/bin/sh |
| |
| usage() |
| { |
| echo "Usage: $0 <milliseconds>" >&2 |
| echo " Returns zero if the reset button is held for >= millseconds." >&2 |
| exit 9 |
| } |
| |
| [ "$#" = 1 ] || usage |
| [ "$1" -gt 1 ] || usage |
| |
| |
| # wait until gpio-mailbox has had at least one loop |
| wait-until-created /tmp/gpio/ready |
| |
| retval=1 # not pressed |
| while [ -e /tmp/gpio/reset_button_msecs ]; do |
| # reset button is pressed at boot time; wait to see if the user |
| # holds it for $1 msec |
| usleep 100000 |
| if [ -e /tmp/gpio/reset_button_msecs ]; then |
| msecs= |
| read msecs </tmp/gpio/reset_button_msecs |
| echo "reset button held for $msecs msecs so far" |
| if [ "$msecs" -gt "$1" ]; then |
| retval=0 # pressed for long enough |
| break |
| fi |
| fi |
| done |
| |
| exit $retval |
