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	description: "[
		Constants used for signal handling.
		This class may be used as ancestor by classes needing its facilities.
	]"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	UNIX_SIGNALS

feature -- Access

	is_defined (sig: INTEGER): BOOLEAN is
			-- Is sig a signal defined for this platform?
		external
			"C | %"eif_sig.h%""
		alias
			"esigdefined"
		end

	is_ignored (sig: INTEGER): BOOLEAN is
			-- Is sig currently set to be ignored?
		do
			Result := not is_caught (sig)
		end

	meaning (sig: INTEGER): STRING is
			-- A message in English describing what sig is
		do
			if is_defined (sig) then
				create Result.make_from_c (c_signal_name (sig))
			end
		end

	sigabrt: INTEGER is
			-- Code for `Abort' signal
		once
			Result := c_signal_map (6)
		end

	sigalrm: INTEGER is
			-- Code for ``Alarm clock'' signal
		once
			Result := c_signal_map (15)
		end

	sigbus: INTEGER is
			-- Code for ``Bus error'' signal
		once
			Result := c_signal_map (11)
		end

	sigchld: INTEGER is
			-- Code for ``Death of a child'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (19)
		end

	sigcld: INTEGER is
			-- Code for ``Death of a child'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (20)
		end

	sigcont: INTEGER is
			-- Code for ``Continue after stop'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (37)
		end

	sigemt: INTEGER is
			-- Code for ``EMT instruction'' signal
		once
			Result := c_signal_map (8)
		end

	sigfpe: INTEGER is
			-- Code for ``Floating point exception'' signal
		once
			Result := c_signal_map (9)
		end

	sighup: INTEGER is
			-- Code for `Hangup' signal
		once
			Result := c_signal_map (1)
		end

	sigill: INTEGER is
			-- Code for ``Illegal instruction'' signal
		once
			Result := c_signal_map (4)
		end

	sigint: INTEGER is
			-- Code for `Interrupt' signal
		once
			Result := c_signal_map (2)
		end

	sigio: INTEGER is
			-- Code for ``Pending I/O on a descriptor'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (21)
		end

	sigiot: INTEGER is
			-- Code for ``IOT instruction'' signal
		once
			Result := c_signal_map (7)
		end

	sigkill: INTEGER is
			-- Code for `Terminator' signal
		once
			Result := c_signal_map (10)
		end

	siglost: INTEGER is
			-- Code for ``Resource lost'' signal
		once
			Result := c_signal_map (35)
		end

	sigphone: INTEGER is
			-- Code for ``Line status change'' signal
		once
			Result := c_signal_map (34)
		end

	sigpipe: INTEGER is
			-- Code for ``Broken pipe'' signal
		once
			Result := c_signal_map (14)
		end

	sigpoll: INTEGER is
			-- Code for ``Selectable event pending'' signal
		once
			Result := c_signal_map (22)
		end

	sigprof: INTEGER is
			-- Code for ``Profiling timer alarm'' signal
		once
			Result := c_signal_map (31)
		end

	sigpwr: INTEGER is
			-- Code for `Power-fail' signal
		once
			Result := c_signal_map (30)
		end

	sigquit: INTEGER is
			-- Code for `Quit' signal
		once
			Result := c_signal_map (3)
		end

	sigsegv: INTEGER is
			-- Code for ``Segmentation violation'' signal
		once
			Result := c_signal_map (12)
		end

	sigstop: INTEGER is
			-- Code for `Stop' signal
		once
			Result := c_signal_map (25)
		end

	sigsys: INTEGER is
			-- Code for ``Bad argument to system call'' signal
		once
			Result := c_signal_map (13)
		end

	sigterm: INTEGER is
			-- Code for ``Software termination'' signal
		once
			Result := c_signal_map (16)
		end

	sigtrap: INTEGER is
			-- Code for ``Trace trap'' signal
		once
			Result := c_signal_map (5)
		end

	sigtstp: INTEGER is
			-- Code for ``Stop from tty'' signal
		once
			Result := c_signal_map (26)
		end

	sigttin: INTEGER is
			-- Code for ``Tty input from background'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (23)
		end

	sigttou: INTEGER is
			-- Code for ``Tty output from background'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (24)
		end

	sigurg: INTEGER is
			-- Code for ``Urgent condition on socket'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (36)
		end

	sigusr1: INTEGER is
			-- Code for ``User-defined signal #1''
		once
			Result := c_signal_map (17)
		end

	sigusr2: INTEGER is
			-- Code for ``User-defined signal #2''
		once
			Result := c_signal_map (18)
		end

	sigvtalarm: INTEGER is
			-- Code for ``Virtual time alarm'' signal
		once
			Result := c_signal_map (29)
		end

	sigwinch: INTEGER is
			-- Code for ``Window size changed'' signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (32)
		end

	sigwind: INTEGER is
			-- Code for ``Window change'' signal
		once
			Result := c_signal_map (33)
		end

	sigxcpu: INTEGER is
			-- Code for ``Cpu time limit exceeded'' signal
		once
			Result := c_signal_map (27)
		end

	sigxfsz: INTEGER is
			-- Code for ``File size limit exceeded'' signal
		once
			Result := c_signal_map (28)
		end
	
feature -- Status report

	signal: INTEGER is
			-- Code of last signal
		external
			"C | %"eif_sig.h%""
		alias
			"esignum"
		end
	
feature -- Status setting

	catch (sig: INTEGER) is
			-- Make sure that future occurrences of sig
			-- will be treated as exceptions.
			-- (This is the default for all signals.)
			-- No effect if signal not defined.
		external
			"C | %"eif_sig.h%""
		alias
			"esigcatch"
		end

	ignore (sig: INTEGER) is
			-- Make sure that future occurrences of sig
			-- will be ignored. (This is not the default.)
			-- No effect if signal not defined.
		external
			"C | %"eif_sig.h%""
		alias
			"esigignore"
		end

	reset_all_default is
			-- Make sure that all exceptions will lead to their
			-- default handling.
		external
			"C | %"eif_sig.h%""
		alias
			"esigresall"
		end

	reset_default (sig: INTEGER) is
			-- Make sure that exception of code code will lead
			-- to its default action.
		require
			is_defined (sig)
		external
			"C | %"eif_sig.h%""
		alias
			"esigresdef"
		end
	
feature {NONE} -- Implementation

	c_signal_map (i: INTEGER): INTEGER is
		external
			"C | %"eif_sig.h%""
		alias
			"esigmap"
		end

	c_signal_name (i: INTEGER): POINTER is
		external
			"C | %"eif_sig.h%""
		alias
			"esigname"
		end

	is_caught (sig: INTEGER): BOOLEAN is
			-- Is sig currently set to be caught?
		external
			"C | %"eif_sig.h%""
		alias
			"esigiscaught"
		end
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class UNIX_SIGNALS


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