PostgreSQL kill - Sighup pid
Probably this will help: 


  The Linux operating system normally terminates, or kills, a task by
  sending it a SIGHUP command. This stands for "Signal Hangup" and
  terminates a process on the system. If a programmer has not created a
  program restart command, or if you are having difficulties with an
  unresponsive program and wish to restart it, sending it a SIGHUP
  command will terminate the program and cause it to automatically
  restart.