# Module `posix.syslog`

Control System Log.

## Functions

LOG_MASK (priority) | Mask bit for given log priority.
closelog () | Close system log.
openlog (ident[, option[, facility=`LOG_USER`]]) | Open the system logger.
setlogmask (mask) | Set log priority mask.
syslog (priority, message) | Write to the system logger.

## Constants

posix.syslog | System logging constants.

## Functions

LOG_MASK (priority)
  Mask bit for given log priority.

  ### Parameters:

  - priority int one of `LOG_EMERG`, `LOG_ALERT`, `LOG_CRIT`, `LOG_WARNING`, `LOG_NOTICE`, `LOG_INFO` or `LOG_DEBUG`

  ### Returns:

  int mask bit corresponding to priority

  ### See also:

  setlogmask(3)
closelog ()
  Close system log.

  ### See also:

  closelog(3)
openlog (ident[, option[, facility=`LOG_USER`]])
  Open the system logger.

  ### Parameters:

  - ident string all messages will start with this
  - option int bitwise OR of zero or more of `LOG_CONS`, `LOG_NDELAY`, or `LOG_PID` (optional)
  - facility int one of `LOG_AUTH`, `LOG_CRON`, `LOG_DAEMON`, `LOG_KERN`, `LOG_LPR`, `LOG_MAIL`, `LOG_NEWS`, `LOG_SECURITY`, `LOG_USER`, `LOG_UUCP` or `LOG_LOCAL0` through `LOG_LOCAL7` (default `LOG_USER`)

  ### See also:

  openlog(3)
setlogmask (mask)
  Set log priority mask.

  ### Parameters:

  - mask int bitwise OR of LOG_MASK bits.

  ### Returns:

  int previous mask, if successful

  ### Or

  1. nil
  2. string error message
  3. int errnum

  ### See also:

  setlogmask(3)
syslog (priority, message)
  Write to the system logger.

  ### Parameters:

  - priority int one of `LOG_EMERG`, `LOG_ALERT`, `LOG_CRIT`, `LOG_WARNING`, `LOG_NOTICE`, `LOG_INFO` or `LOG_DEBUG`
  - message string log message

  ### See also:

  syslog(3)

## Constants

posix.syslog
  System logging constants. Any constants not available in the underlying system will be `nil` valued.

  ### Fields:

  - LOG_AUTH int security/authorisation messages
  - LOG_CONS int write directly to system console
  - LOG_CRON int clock daemon
  - LOG_DAEMON int system daemons
  - LOG_KERN int kernel messages
  - LOG_LOCAL0 int reserved for local use
  - LOG_LOCAL1 int reserved for local use
  - LOG_LOCAL2 int reserved for local use
  - LOG_LOCAL3 int reserved for local use
  - LOG_LOCAL4 int reserved for local use
  - LOG_LOCAL5 int reserved for local use
  - LOG_LOCAL6 int reserved for local use
  - LOG_LOCAL7 int reserved for local use
  - LOG_LPR int line printer subsystem
  - LOG_MAIL int mail system
  - LOG_NDELAY int open the connection immediately
  - LOG_NEWS int network news subsystem
  - LOG_PID int include process id with each log message
  - LOG_USER int random user-level messages
  - LOG_UUCP int unix-to-unix copy subsystem
  - LOG_EMERG int system is unusable
  - LOG_ALERT int action must be taken immediately
  - LOG_CRIT int critical conditions
  - LOG_ERR int error conditions
  - LOG_WARNING int warning conditions
  - LOG_NOTICE int normal but significant conditions
  - LOG_INFO int informational
  - LOG_DEBUG int debug-level messages

  ### Usage:

      -- Print syslog constants supported on this host.
      for name, value in pairs (require "posix.syslog") do
        if type (value) == "number" then
          print (name, value)
         end
      end

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