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ksh interrupt read instruction with signal
12-02-2011
#!/bin/ksh
typeset TEXT=""
typeset TMOUT=0
function _read
{
read $@
}
function get_status
{
while true
do
(( i += 1 ))
#sleep 2
#echo "$i sleep a while on the start"
trap '{
print "Got a signal!"
continue
}' USR1
echo "$i Running background job and asking for the input"
ppid=$$
{
sleep $TMOUT
echo "$i time is up..."
echo "$i sending sig to ${ppid}"
kill -s USR1 ${ppid}
} &
bgpid=${!}
_read TEXT
kill -9 ${bgpid}
echo "$i doing something: $TEXT"
done
}
get_status
[Linux] # ./a2.ksh 1 Running background job and asking for the input 1 time is up... 1 sending sig to 9277 Got a signal! 2 Running background job and asking for the input 2 time is up... 2 sending sig to 9277 Got a signal! 3 Running background job and asking for the input 3 time is up... 3 sending sig to 9277 .... # and it's running..... # but finally: ... 1596 Running background job and asking for the input 1596 time is up... 1596 sending sig to 9277 Got a signal! 1597 Running background job and asking for the input 1597 time is up... 1597 sending sig to 9277 Got a signal! User signal 1
#!/bin/ksh
typeset TEXT=""
typeset TMOUT=0
function _read
{
read $@
}
function get_status
{
while true
do
(( i += 1 ))
#sleep 2
#echo "$i sleep a while on the start"
trap '{
print "Got a signal!"
# Clean up bg process
kill -9 ${bgpid}
# make sure bg process is not running
kill -0 ${bgpid} > /dev/null 2>&1 &&
{
echo "Still running ${bgpid}"
sleep 1
}
continue
}' USR1
echo "$i Running background job and asking for the input"
ppid=$$
{
sleep 0
echo "$i time is up... sending sig to ${ppid}"
kill -s USR1 ${ppid}
echo "$i kill rc=$?"
} &
echo "$i sent in background, rc: $?"
bgpid=${!}
_read TEXT
kill -9 ${bgpid}
echo "$i doing something: $TEXT"
done
}
get_status|
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