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Date: Sat, 21 Mar 2009 23:57:26 +0200
From: Yura Kalinichenko <yuk@kalina.in.ua>
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Subject: Re: [Comm] =?koi8-r?b?+sXSy8HMydLP18HOycUg0M8g0sHT0MnTwc7JwC4=?=
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Vladimir Karpinsky =D0=C9=DB=C5=D4:
> =FA=C4=D2=C1=D7=D3=D4=D7=D5=CA=D4=C5!
>
> Alexey Borovskoy =D0=C9=DB=C5=D4:
>> * =F3=D2=C5=C4=C1 10 =C4=C5=CB=C1=C2=D2=D1 2008 Vladimir Karpinsky
>>
>> --=CB=D5=D3=D8--
>>
>> #!/bin/bash
>>
>> exit_handler() {
>>     trap - EXIT
>>     [ -f "$LOCK_FILE" ] && rm -f "$LOCK_FILE"
>> }
>>
>> trap exit_handler HUP PIPE INT QUIT TERM EXIT
>>
>> date> "$LOCK_FILE"
>>
>> --=CB=D5=D3=D8--
>>
>> =EC=CF=C7=C9=CB=D5 =C4=CF=D0=C9=D3=C1=D4=D8 =D0=CF =D7=CB=D5=D3=D5
>
> =EC=CF=C7=C9=CB=D5 =C4=CF=D0=C9=D3=C1=CC, =D5=D6=C5 =D2=C1=C2=CF=D4=C1=C5=
=D4 =D0=C1=D2=D5 =CD=C5=D3=D1=C3=C5=D7, =CE=CF =D3=C5=C7=CF=C4=CE=D1 =D5=C7=
=CC=D1=C4=C5=CC=20
> =D0=D2=CF=C2=CC=C5=CD=D9: =C5=D3=CC=C9 =CE=C1 =D3=CB=D2=C9=D0=D4, =D3=CF=
=C4=C5=D2=D6=C1=DD=C9=CA =D7=D9=DB=C5=CC=C5=D6=C1=DD=C9=CA =CB=D5=D3=CF=CB=
 =CE=C1=D4=D2=C1=D7=C9=D4=D8 kill=20
> -9, =D4=CF lock-=C6=C1=CA=CC =CE=C5 =D5=CE=C9=DE=D4=CF=D6=C1=C5=D4=D3=D1=
. =ED=CF=D6=CE=CF =CC=C9 =CB=C1=CB-=D4=CF =D4=C1=CB=CF=CA =D7=C1=D2=C9=C1=
=CE=D4 =D5=DE=C5=D3=D4=D8.
>
> =F7=D4=CF=D2=CF=CA =CD=CF=CD=C5=CE=D4: =D1 =DA=C1=D0=D5=D3=CB=C1=C0 =DC=
=D4=CF=D4 =D6=C5 =D3=CB=D2=C9=D0=D4 =D7=D4=CF=D2=CF=CA =D2=C1=DA =D0=D2=C9=
 =CE=C1=CC=C9=DE=C9=C9=20
> lock-=C6=C1=CA=CC=C1, =CF=CE =CF=C2=CE=C1=D2=D5=D6=C9=D7=C1=C5=D4 lock-=
=C6=C1=CA=CC, =CE=C9=DE=C5=C7=CF =CE=C5 =C4=C5=CC=C1=C5=D4 =C9 =D7=D9=C8=CF=
=C4=C9=D4 =D3=20
> =CE=C5=CE=D5=CC=C5=D7=D9=CD =CB=CF=C4=CF=CD. =F7=D3=A3 =CB=C1=DA=C1=CC=CF=
=D3=D8 =C2=D9 =C8=CF=D2=CF=DB=CF. =EE=CF: =CF=CE =D7=D9=C8=CF=C4=C9=D4-=D4=
=CF =D0=CF =CB=CF=CD=C1=CE=C4=C5=20
> exit =C9 =C1=D7=D4=CF=CD=C1=D4=CF=CD =D5=C2=C9=D7=C1=C5=D4 lock-=C6=C1=CA=
=CC, =D4.=C5. =D0=D2=C9 =D4=D2=C5=D4=D8=C5=CD =DA=C1=D0=D5=D3=CB=C5 =D3=CB=
=D2=C9=D0=D4=C1=20
> =D5=D6=C5 lock-=C6=C1=CA=CC =CE=C5 =C2=D5=C4=C5=D4 =CE=C1=CA=C4=C5=CE, =
=C9 =D3=CB=D2=C9=D0=D4 =C2=D5=C4=C5=D4 =D0=D9=D4=C1=D4=D8=D3=D1 =D2=C1=C2=
=CF=D4=C1=D4=D8, =DE=C5=C7=CF=20
> =C2=D9 =CE=C5 =C8=CF=D4=C5=CC=CF=D3=D8. =EE=C5 =CD=CF=C7=D5 =D3=CF=CF=C2=
=D2=C1=DA=C9=D4=D8, =CB=C1=CB =DC=D4=CF =CF=C2=CF=CA=D4=C9.
>
=EF=C2=D9=DE=CE=CF =C2=CC=CF=CB=C9=D2=CF=D7=CB=C9 =D7=D9=D0=CF=CC=CE=D1=C0=
=D4=D3=D1 =CE=C5=D3=CB=CF=CC=D8=CB=CF =C4=D2=D5=C7=C9=CD =CF=C2=D2=C1=DA=CF=
=CD. =F7=CF=D4 =D0=D2=C9=CD=C5=D2,=20
=CE=C1=C4=C5=C0=D3=D8, =C4=CF=D3=D4=C1=D4=CF=DE=CE=CF =D0=CF=CE=D1=D4=CE=CF=
, =DE=D4=CF =D7=C1=DB=C9=C8 =D0=D2=CF=C2=CC=C5=CD =DA=C4=C5=D3=D8 =CE=C5 =
=C2=D5=C4=C5=D4:

---------------------------cut-----------------------------
USE_LOCK=3Dyes
LOCKDIR=3D/tmp
LOCKFILE=3Dtest.pid
mypid=3D$$

test_lock() {

  LOCK_LOOP_COUNT=3D10
  test "$USE_LOCK" \!=3D "yes" && return 0
  set -o noclobber
  until echo $mypid > $LOCKDIR/$LOCKFILE ; do
     kill -0 `cat $LOCKDIR/$LOCKFILE` || rm -f $LOCKDIR/$LOCKFILE
     if [ -f  "$LOCKDIR/$LOCKFILE" ]; then
       echo "Locking ($LOCK_LOOP_COUNT)..."
       let LOCK_LOOP_COUNT--
       if [ $LOCK_LOOP_COUNT -eq 0 ]; then
          break
       else
          sleep 1
       fi
     else
       echo "Remove stalled lock"
     fi
  done
  set +o noclobber
  if [ $LOCK_LOOP_COUNT -eq 0 ]; then
     return 1
  else
     return 0
  fi
}

test_unlock() {
  test -f $LOCKDIR/$LOCKFILE -a $mypid -eq `cat $LOCKDIR/$LOCKFILE` && rm=
 -f $LOCKDIR/$LOCKFILE
  return $?
}


---------------------------cut-----------------------------


--=20
SY,=20
   Yura Kalinichenko