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enter_quiet_zone(3)
NAME
  enter_quiet_zone, exit_quiet_zone - Prevent keyboard interruption of
  program actions (Enhanced Security)

LIBRARY
  Security Library - libsecurity.a and libsecurity.so

SYNOPSIS
  #include <prot.h>
  void enter_quiet_zone();

  #include <prot.h>
  void exit_quiet_zone();

DESCRIPTION
  The enter_quiet_zone() function sets the appropriate signals to a state
  that prevents keyboard interruption of program actions.  If this function
  is called multiple times without an intervening exit_quiet_zone() call,
  nothing is done.  If an alarm has been set, the time left to go is saved.

  The exit_quiet_zone() function restores the signals to their previous
  state.  Do not call this function from reentrant code because it uses a
  static area.	A pending alarm clock is restored.

  The signals that are affected are SIGHUP, SIGINT, SIGQUIT, SIGSYS, SIGALRM.

RELATED INFORMATION
  Security