Server Response to Signals

On Unix, signals can be sent to processes. mysqld responds to signals sent to it as follows:

• SIGTERM causes the server to shut down.
• SIGHUP causes the server to reload the grant tables and flush the logs (like FLUSH PRIVILEGES and FLUSH LOGS). It also writes a status report to the error log that has this format:

  Status information:
  Current dir: /var/mysql/data/
  Running threads: 0 Stack size: 196608
  Current locks:
  Key caches:
  default Buffer_size: 8388600
  Block_size: 1024
  Division_limit: 100
  Age_limit: 300
  blocks used: 0
  not flushed: 0
  w_requests: 0
  writes: 0
  r_requests: 0
  reads: 0
  handler status:
  read_key: 0
  read_next: 0
  read_rnd 0
  read_first: 1
  write: 0
  delete 0
  update: 0
  Table status:
  Opened tables: 5
  Open tables: 0
  Open files: 7
  Open streams: 0
  Alarm status:
  Active alarms: 1
  Max used alarms: 2
  Next alarm time: 67
  

On some Mac OS X 10.3 versions, mysqld ignores SIGHUP and SIGQUIT.

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