examples/scripts/timeout2

   1 #!/bin/sh
   2
   3 # Author: P@draigBrady.com
   4 # V1.0  : Nov  3 2006
   5 #
   6 #  Execute a command with a timeout.
   7 #  If the timeout occurs the exit status is 128
   8 #
   9 #  Note there is an asynchronous equivalent of this
  10 #  script packaged with bash (under /usr/share/doc/ in my distro),
  11 #  which I only noticed after writing this.
  12
  13 if [ "$#" -lt "2" ]; then
  14     echo "Usage:   `basename $0` timeout_in_seconds command" >&2
  15     echo "Example: `basename $0` 2 sleep 3 || echo timeout" >&2
  16     exit 1
  17 fi
  18
  19 cleanup()
  20 {
  21     kill %1 2>/dev/null             #kill sleep $timeout if running
  22     kill %2 2>/dev/null && exit 128 #kill monitored job if running
  23 }
  24
  25 set -m               #enable job control
  26 trap "cleanup" 17    #cleanup after timeout or command
  27 timeout=$1 && shift  #first param is timeout in seconds
  28 sleep $timeout&      #start the timeout
  29 "$@"                 #start the job