note
	description: "[
		Constants used for signal handling.
		This class may be used as ancestor by classes needing its facilities.
	]"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2018-04-28 20:47:11 +0000 (Sat, 28 Apr 2018) $"
	revision: "$Revision: 101695 $"

class 
	UNIX_SIGNALS

create 
	default_create

feature -- Access

	meaning (sig: INTEGER_32): detachable STRING_8
			-- A message in English describing what sig is
		do
			if is_defined (sig) then
				create Result.make_from_c (c_signal_name (sig))
			end
		ensure
			instance_free: class
		end

	is_defined (sig: INTEGER_32): BOOLEAN
			-- Is sig a signal defined for this platform?
		external
			"C use %"eif_sig.h%""
		alias
			"esigdefined"
		ensure
			instance_free: class
		end

	is_ignored (sig: INTEGER_32): BOOLEAN
			-- Is sig currently set to be ignored?
		do
			Result := not is_caught (sig)
		ensure
			instance_free: class
		end

	Sighup: INTEGER_32
			-- Code for Hangup signal
		once
			Result := c_signal_map (1)
		ensure
			instance_free: class
		end

	Sigint: INTEGER_32
			-- Code for Interrupt signal
		once
			Result := c_signal_map (2)
		ensure
			instance_free: class
		end

	Sigquit: INTEGER_32
			-- Code for Quit signal
		once
			Result := c_signal_map (3)
		ensure
			instance_free: class
		end

	Sigill: INTEGER_32
			-- Code for Illegal instruction signal
		once
			Result := c_signal_map (4)
		ensure
			instance_free: class
		end

	Sigtrap: INTEGER_32
			-- Code for Trace trap signal
		once
			Result := c_signal_map (5)
		ensure
			instance_free: class
		end

	Sigabrt: INTEGER_32
			-- Code for Abort signal
		once
			Result := c_signal_map (6)
		ensure
			instance_free: class
		end

	Sigiot: INTEGER_32
			-- Code for IOT instruction signal
		once
			Result := c_signal_map (7)
		ensure
			instance_free: class
		end

	Sigemt: INTEGER_32
			-- Code for EMT instruction signal
		once
			Result := c_signal_map (8)
		ensure
			instance_free: class
		end

	Sigfpe: INTEGER_32
			-- Code for Floating point exception signal
		once
			Result := c_signal_map (9)
		ensure
			instance_free: class
		end

	Sigkill: INTEGER_32
			-- Code for Terminator signal
		once
			Result := c_signal_map (10)
		ensure
			instance_free: class
		end

	Sigbus: INTEGER_32
			-- Code for Bus error signal
		once
			Result := c_signal_map (11)
		ensure
			instance_free: class
		end

	Sigsegv: INTEGER_32
			-- Code for Segmentation violation signal
		once
			Result := c_signal_map (12)
		ensure
			instance_free: class
		end

	Sigsys: INTEGER_32
			-- Code for Bad argument to system call signal
		once
			Result := c_signal_map (13)
		ensure
			instance_free: class
		end

	Sigpipe: INTEGER_32
			-- Code for Broken pipe signal
		once
			Result := c_signal_map (14)
		ensure
			instance_free: class
		end

	Sigalrm: INTEGER_32
			-- Code for Alarm clock signal
		once
			Result := c_signal_map (15)
		ensure
			instance_free: class
		end

	Sigterm: INTEGER_32
			-- Code for Software termination signal
		once
			Result := c_signal_map (16)
		ensure
			instance_free: class
		end

	Sigusr1: INTEGER_32
			-- Code for User-defined signal #1
		once
			Result := c_signal_map (17)
		ensure
			instance_free: class
		end

	Sigusr2: INTEGER_32
			-- Code for User-defined signal #2
		once
			Result := c_signal_map (18)
		ensure
			instance_free: class
		end

	Sigchld: INTEGER_32
			-- Code for Death of a child signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (19)
		ensure
			instance_free: class
		end

	Sigcld: INTEGER_32
			-- Code for Death of a child signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (20)
		ensure
			instance_free: class
		end

	Sigio: INTEGER_32
			-- Code for Pending I/O on a descriptor signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (21)
		ensure
			instance_free: class
		end

	Sigpoll: INTEGER_32
			-- Code for Selectable event pending signal
		once
			Result := c_signal_map (22)
		ensure
			instance_free: class
		end

	Sigttin: INTEGER_32
			-- Code for Tty input from background signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (23)
		ensure
			instance_free: class
		end

	Sigttou: INTEGER_32
			-- Code for Tty output from background signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (24)
		ensure
			instance_free: class
		end

	Sigstop: INTEGER_32
			-- Code for Stop signal
		once
			Result := c_signal_map (25)
		ensure
			instance_free: class
		end

	Sigtstp: INTEGER_32
			-- Code for Stop from tty signal
		once
			Result := c_signal_map (26)
		ensure
			instance_free: class
		end

	Sigxcpu: INTEGER_32
			-- Code for Cpu time limit exceeded signal
		once
			Result := c_signal_map (27)
		ensure
			instance_free: class
		end

	Sigxfsz: INTEGER_32
			-- Code for File size limit exceeded signal
		once
			Result := c_signal_map (28)
		ensure
			instance_free: class
		end

	Sigvtalarm: INTEGER_32
			-- Code for Virtual time alarm signal
		once
			Result := c_signal_map (29)
		ensure
			instance_free: class
		end

	Sigpwr: INTEGER_32
			-- Code for Power-fail signal
		once
			Result := c_signal_map (30)
		ensure
			instance_free: class
		end

	Sigprof: INTEGER_32
			-- Code for Profiling timer alarm signal
		once
			Result := c_signal_map (31)
		ensure
			instance_free: class
		end

	Sigwinch: INTEGER_32
			-- Code for Window size changed signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (32)
		ensure
			instance_free: class
		end

	Sigwind: INTEGER_32
			-- Code for Window change signal
		once
			Result := c_signal_map (33)
		ensure
			instance_free: class
		end

	Sigphone: INTEGER_32
			-- Code for Line status change signal
		once
			Result := c_signal_map (34)
		ensure
			instance_free: class
		end

	Siglost: INTEGER_32
			-- Code for Resource lost signal
		once
			Result := c_signal_map (35)
		ensure
			instance_free: class
		end

	Sigurg: INTEGER_32
			-- Code for Urgent condition on socket signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (36)
		ensure
			instance_free: class
		end

	Sigcont: INTEGER_32
			-- Code for Continue after stop signal.
			-- Signal ignored by default
		once
			Result := c_signal_map (37)
		ensure
			instance_free: class
		end
	
feature -- Status report

	signal: INTEGER_32
			-- Code of last signal
		external
			"C use %"eif_sig.h%""
		alias
			"esignum"
		ensure
			instance_free: class
		end
	
feature -- Status setting

	catch (sig: INTEGER_32)
			-- 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 use %"eif_sig.h%""
		alias
			"esigcatch"
		ensure
			instance_free: class
		end

	ignore (sig: INTEGER_32)
			-- Make sure that future occurrences of sig
			-- will be ignored. (This is not the default.)
			-- No effect if signal not defined.
		external
			"C use %"eif_sig.h%""
		alias
			"esigignore"
		ensure
			instance_free: class
		end

	reset_all_default
			-- Make sure that all exceptions will lead to their
			-- default handling.
		external
			"C use %"eif_sig.h%""
		alias
			"esigresall"
		ensure
			instance_free: class
		end

	reset_default (sig: INTEGER_32)
			-- Make sure that exception of code code will lead
			-- to its default action.
		require
				is_defined (sig)
		external
			"C use %"eif_sig.h%""
		alias
			"esigresdef"
		ensure
			instance_free: class
		end
	
feature {NONE} -- Implementation

	is_caught (sig: INTEGER_32): BOOLEAN
			-- Is sig currently set to be caught?
		external
			"C use %"eif_sig.h%""
		alias
			"esigiscaught"
		ensure
			instance_free: class
		end

	c_signal_map (i: INTEGER_32): INTEGER_32
		external
			"C use %"eif_sig.h%""
		alias
			"esigmap"
		ensure
			instance_free: class
		end

	c_signal_name (i: INTEGER_32): POINTER
		external
			"C use %"eif_sig.h%""
		alias
			"esigname"
		ensure
			instance_free: class
		end
	
note
	copyright: "Copyright (c) 1984-2018, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class UNIX_SIGNALS

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