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317 | ------------------------------------------------------------------------------
-- --
-- FLORIST (FSU Implementation of POSIX.5) COMPONENTS --
-- --
-- P O S I X . S I G N A L S --
-- --
-- S p e c --
-- --
-- --
-- This file is a component of FLORIST, an implementation of the POSIX --
-- Ada bindings for use with the GNAT Ada compiler and the FSU Gnu Ada --
-- Runtime Library (GNARL). --
-- --
-- This package specification contains some text extracted from IEEE STD --
-- 1003.5: 1990, Information Technology -- POSIX Ada Language Interfaces --
-- Part 1: Binding for System Application Program Interface, as amended --
-- by IEEE STD 1003.5b: 1996, Amendment 1: Realtime Extensions, copyright --
-- 1996 by the Institute of Electrical and Electronics Engineers, Inc. --
-- --
-- The package specifications in the IEEE standards cited above represent --
-- only a portion of the documents and are not to be interpreteted --
-- outside the context of the documents. The standards must be used in --
-- conjunction with the package specifications in order to claim --
-- conformance. The IEEE takes no responsibility for and will assume no --
-- liability for damages resulting from the reader's misinterpretation of --
-- said information resulting from its out-of-context nature. To order --
-- copies of the IEEE standards, please contact the IEEE Service Center --
-- at 445 Hoes Lane, PO Box 1331, Piscataway, NJ 08855-1331; via phone at --
-- 1-800-678-IEEE, 908-981-1393; or via fax at 908-981-9667. --
-- --
-- These package specifications are distributed in the hope that they --
-- will be useful, but WITHOUT ANY WARRANTY; without even the implied --
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
------------------------------------------------------------------------------
with Ada.Task_Identification,
Ada.Finalization,
POSIX.C,
POSIX.Process_Identification,
System,
System.Interrupt_Management,
System.Storage_Elements;
-- To ensure that this file does not get compiled when thread support is
-- disabled
pragma Warnings (Off);
with POSIX.Implementation.OK_Signals;
pragma Warnings (On);
package POSIX.Signals is
-- Signal Type
type Signal is
new System.Interrupt_Management.Interrupt_ID'Base
range 0 .. POSIX.C.NSIGS;
for Signal'Size use POSIX.C.int'Size;
function Image (Sig : Signal) return String;
function Value (Str : String) return Signal;
-- Standard Signals (required)
Signal_Null,
SIGNULL : constant Signal := 0;
Signal_Abort,
SIGABRT : constant Signal := POSIX.C.SIGABRT;
Signal_Alarm,
SIGALRM : constant Signal := POSIX.C.SIGALRM;
Signal_Bus_Error,
SIGBUS : constant Signal := POSIX.C.SIGBUS;
Signal_Floating_Point_Error,
SIGFPE : constant Signal := POSIX.C.SIGFPE;
Signal_Hangup,
SIGHUP : constant Signal := POSIX.C.SIGHUP;
Signal_Illegal_Instruction,
SIGILL : constant Signal := POSIX.C.SIGILL;
Signal_Interrupt,
SIGINT : constant Signal := POSIX.C.SIGINT;
Signal_Kill,
SIGKILL : constant Signal := POSIX.C.SIGKILL;
Signal_Pipe_Write,
SIGPIPE : constant Signal := POSIX.C.SIGPIPE;
Signal_Quit,
SIGQUIT : constant Signal := POSIX.C.SIGQUIT;
Signal_Segmentation_Violation,
SIGSEGV : constant Signal := POSIX.C.SIGSEGV;
Signal_Terminate,
SIGTERM : constant Signal := POSIX.C.SIGTERM;
Signal_User_1,
SIGUSR1 : constant Signal := POSIX.C.SIGUSR1;
Signal_User_2,
SIGUSR2 : constant Signal := POSIX.C.SIGUSR2;
-- Standard Signals (job control)
Signal_Child,
SIGCHLD : constant Signal := POSIX.C.SIGCHLD;
Signal_Continue,
SIGCONT : constant Signal := POSIX.C.SIGCONT;
Signal_Stop,
SIGSTOP : constant Signal := POSIX.C.SIGSTOP;
Signal_Terminal_Stop,
SIGTSTP : constant Signal := POSIX.C.SIGTSTP;
Signal_Terminal_Input,
SIGTTIN : constant Signal := POSIX.C.SIGTTIN;
Signal_Terminal_Output,
SIGTTOU : constant Signal := POSIX.C.SIGTTOU;
-- Signals from P1003.5c
Signal_IO,
SIGIO : constant Signal := POSIX.C.SIGIO;
Signal_Out_Of_Band_Data,
SIGURG : constant Signal := POSIX.C.SIGURG;
subtype Realtime_Signal is Signal range
Signal (POSIX.C.SIGRTMIN) .. POSIX.C.SIGRTMAX;
-- Signal sets
type Signal_Set is private;
procedure Add_Signal
(Set : in out Signal_Set;
Sig : Signal);
procedure Add_All_Signals (Set : in out Signal_Set);
procedure Delete_Signal
(Set : in out Signal_Set;
Sig : Signal);
procedure Delete_All_Signals (Set : in out Signal_Set);
function Is_Member
(Set : Signal_Set;
Sig : Signal)
return Boolean;
-- Blocking and Unblocking Signals
procedure Set_Blocked_Signals
(New_Mask : Signal_Set;
Old_Mask : out Signal_Set);
procedure Block_Signals
(Mask_to_Add : Signal_Set;
Old_Mask : out Signal_Set);
procedure Unblock_Signals
(Mask_to_Subtract : Signal_Set;
Old_Mask : out Signal_Set);
function Blocked_Signals return Signal_Set;
-- Ignoring Signals
procedure Ignore_Signal (Sig : Signal);
procedure Unignore_Signal (Sig : Signal);
procedure Restore_Default_Action (Sig : Signal) renames Unignore_Signal;
function Is_Ignored (Sig : Signal) return Boolean;
procedure Install_Empty_Handler (Sig : Signal);
-- Controlling Delivery of Signal_Child Signal
procedure Set_Stopped_Child_Signal (Enable : Boolean := True);
function Stopped_Child_Signal_Enabled return Boolean;
-- Examining Pending Signals
function Pending_Signals return Signal_Set;
type Signal_Event is private;
type Signal_Data is private;
type Notification is range Integer'First .. Integer'Last;
No_Notification : constant Notification := POSIX.C.SIGEV_NONE;
Signal_Notification : constant Notification := POSIX.C.SIGEV_SIGNAL;
function Get_Signal (Event : Signal_Event) return Signal;
procedure Set_Signal
(Event : in out Signal_Event;
Sig : Signal);
function Get_Notification (Event : Signal_Event) return Notification;
procedure Set_Notification
(Event : in out Signal_Event;
Notify : Notification);
function Get_Data (Event : Signal_Event) return Signal_Data;
procedure Set_Data
(Event : in out Signal_Event;
Data : Signal_Data);
type Signal_Source is range Integer'First .. Integer'Last;
From_Send_Signal : constant Signal_Source := POSIX.C.SI_USER;
From_Queue_Signal : constant Signal_Source := POSIX.C.SI_QUEUE;
From_Timer : constant Signal_Source := POSIX.C.SI_TIMER;
From_Async_IO : constant Signal_Source := POSIX.C.SI_ASYNCIO;
From_Message_Queue : constant Signal_Source := POSIX.C.SI_MESGQ;
type Signal_Info is private;
function Get_Signal (Info : Signal_Info) return Signal;
procedure Set_Signal
(Info : in out Signal_Info;
Sig : Signal);
function Get_Source (Info : Signal_Info) return Signal_Source;
procedure Set_Source
(Info : in out Signal_Info;
Source : Signal_Source);
function Has_Data (Source : Signal_Source) return Boolean;
function Get_Data (Info : Signal_Info) return Signal_Data;
procedure Set_Data
(Info : in out Signal_Info;
Data : Signal_Data);
procedure Enable_Queueing (Sig : Signal);
procedure Disable_Queueing (Sig : Signal);
function Await_Signal (Set : Signal_Set) return Signal;
function Await_Signal_Or_Timeout
(Set : Signal_Set;
Timeout : POSIX.Timespec)
return Signal;
function Await_Signal (Set : Signal_Set) return Signal_Info;
function Await_Signal_Or_Timeout
(Set : Signal_Set;
Timeout : POSIX.Timespec)
return Signal_Info;
Signal_Abort_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGABRT));
Signal_Hangup_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGHUP));
Signal_Interrupt_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGINT));
Signal_Pipe_Write_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGPIPE));
Signal_Quit_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGQUIT));
Signal_Terminate_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGTERM));
Signal_User_1_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGUSR1));
Signal_User_2_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGUSR2));
Signal_Child_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGCHLD));
Signal_Continue_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGCONT));
Signal_Terminal_Stop_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGTSTP));
Signal_Terminal_Input_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGTTIN));
Signal_Terminal_Output_Ref : constant System.Address
:= System.Storage_Elements.To_Address
(System.Storage_Elements.Integer_Address (SIGTTOU));
function Signal_Reference (Sig : Signal) return System.Address;
procedure Send_Signal
(Process : POSIX.Process_Identification.Process_ID;
Sig : Signal);
procedure Send_Signal
(Group : POSIX.Process_Identification.Process_Group_ID;
Sig : Signal);
procedure Send_Signal (Sig : Signal);
procedure Queue_Signal
(Process : POSIX.Process_Identification.Process_ID;
Sig : Signal;
Data : Signal_Data);
procedure Interrupt_Task
(T : Ada.Task_Identification.Task_Id);
private
type Signal_Set is new Ada.Finalization.Controlled with record
C : aliased POSIX.C.sigset_t;
end record;
procedure Initialize (Set : in out Signal_Set);
procedure Finalize (Set : in out Signal_Set);
-- We formerly used an explicit array, rather than the C type
-- sigset_t, because:
-- 1. C provides no operation to enumerate the
-- members of a sigset_t, other than calling sigismember() for
-- every value in the range of valid Signals.
-- 2. We would have to use a controlled type to do the initialization,
-- since making a sigset_t object empty requires calling sigemptyset.
-- We should have put the array inside a record, to get
-- default initialization, but did not -- a mistake that needed
-- correcting in any case.
-- 3. We thought objects of type sigset_t might involve implicitly
-- allocated dynamic storage, which could lead to storage leakage,
-- and would not support private-type (assignment) semantics.
-- Unfortunately, using this different representation meant quite a
-- bit of extra computation, to translate between the two forms, and
-- that ends up with iteration over the range of valid Signals anyway.
-- The current solution does assume that the sigset_t representation
-- supports meaningful equality testing.
type Signal_Info is new POSIX.C.siginfo_t;
type Signal_Event is new POSIX.C.struct_sigevent;
type Signal_Data is record
Data : System.Storage_Elements.Storage_Array
(1 .. POSIX.C.sigval_byte_size);
end record;
for Signal_Data'Alignment use POSIX.C.sigval_alignment;
end POSIX.Signals;
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