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#!/bin/bash
# For ppp to work, stty must work on file descriptor 0.
# If stty fails, so will ppp.
NAME=wait_for_reset
: ${LOG:="/usr/bin/logger -t ${NAME} -p daemon.notice"}
USR2=12
TERM=15
# Child used to set our PID in the radio-reset-monitor
function sleep_reset
{
# Wait for parent to enter wait.
trap "exit 0" $TERM
while [[ $(ps -h -o wchan -p $PPID) != do_wait ]] ; do usleep 100 ; done
${LOG} Register for SIGUSR2 when radio-reset complete
echo "$$" "$USR2" >/sys/devices/platform/mts-io/radio-reset-monitor
discovered=$(cat /sys/devices/platform/mts-io/radio-udev-discovery)
if ((discovered == 1)) ; then
# reset is not in progress.
exit 0
fi
sleep 4294967295 # Hopefully forever
exit 0
}
# Wait for radio-reset to complete
function wait_for_reset
{
# Wait for radio reset/modem discovery
trap ":" $USR2
in_reset=$(cat /sys/devices/platform/mts-io/radio-udev-discovery)
if ((in_reset == 0)) ; then
sleep_reset &
wait $!
# pgrep is needed to find the sleep process
echo "pgrep -P: $(pgrep -P $!)"
pgrep -P $! | xargs kill
${LOG} "radio-reset is complete"
fi
echo "$$" "0" >/sys/devices/platform/mts-io/radio-reset-monitor
trap "" $USR2
}
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